Board Certified Ophthalmologist Exam — Questions and Answers

Question 1: Which inherited condition causes bilateral lens subluxation superiorly and temporally and is associated with tall stature?

Ehlers-Danlos syndrome
Marfan syndrome (Correct answer)
Weill-Marchesani syndrome
Homocystinuria

Correct answer: Marfan syndrome

Marfan syndrome classically causes superotemporal lens subluxation due to defective fibrillin in the zonular fibers.

Question 2: An eye's refractive state is such that parallel rays of light form two focal lines. The vertical focal line is focused 1.00 D in front of the retina, while the horizontal focal line is focused directly on the retina. How is this refractive error best classified?

Simple myopic astigmatism (Correct answer)
Compound myopic astigmatism
Mixed astigmatism
Simple hyperopic astigmatism

Correct answer: Simple myopic astigmatism

This condition describes simple myopic astigmatism. In this type of astigmatism, one of the principal meridians is myopic (focuses light in front of the retina), while the other meridian is emmetropic (focuses light directly on the retina). Compound myopic astigmatism would have both focal lines in front of the retina, and simple hyperopic astigmatism would have one line on the retina and one behind it. [12, 15, 29]

Question 3: A patient presents with a painless, slowly progressive unilateral proptosis. MRI shows a well-circumscribed intraconal mass with homogeneous enhancement. What is the most likely diagnosis?

Orbital varix
Optic nerve sheath meningioma
Metastatic lesion
Cavernous hemangioma (cavernous venous malformation) (Correct answer)

Correct answer: Cavernous hemangioma (cavernous venous malformation)

Cavernous hemangioma (cavernous venous malformation) is the most common benign orbital tumor in adults and presents as a well-circumscribed intraconal mass with homogeneous enhancement.

Question 4: A 55-year-old patient presents with acute angle-closure crisis. After initial medical management with topical and systemic agents, what is the definitive treatment?

Trabeculectomy
Laser peripheral iridotomy (Correct answer)
Long-term oral acetazolamide
Goniotomy

Correct answer: Laser peripheral iridotomy

Laser peripheral iridotomy is the definitive treatment for acute angle-closure by eliminating pupillary block.

Question 5: A patient with primary open-angle glaucoma on maximum tolerated medical therapy continues to show progressive visual field loss. What is the most appropriate next step in management?

Trabeculectomy (Correct answer)
Add a fourth topical medication
Laser peripheral iridotomy
Repeat visual field testing in 6 months

Correct answer: Trabeculectomy

Trabeculectomy is indicated when medical therapy fails to control progressive glaucomatous damage.

Question 6: Which symptom is most commonly associated with acute angle-closure glaucoma?

Slow peripheral vision loss
Dryness and grittiness
Sudden severe eye pain (Correct answer)
Itchy eyes

Correct answer: Sudden severe eye pain

Retinal detachment occurs when the retina separates from its underlying supportive tissue, leading to potential vision loss. Common initial symptoms include a sudden onset of flashes of light (photopsia) and new, numerous floaters, which may appear as specks or cobwebs in the visual field. These symptoms warrant immediate ophthalmological evaluation.

Question 7: What is the most common benign eyelid lesion in adults?

Hordeolum (stye)
Chalazion (Correct answer)
Papilloma
Sebaceous cyst

Correct answer: Chalazion

A chalazion, caused by obstruction of a meibomian gland leading to a sterile lipogranulomatous reaction, is the most common benign eyelid lesion in adults.

Question 8: In unilateral aphakia, which correction method produces the least aniseikonia?

Posterior chamber intraocular lens (Correct answer)
Soft contact lens
Rigid gas permeable contact lens
Aphakic spectacle lens

Correct answer: Posterior chamber intraocular lens

An IOL near the eye's nodal point causes about 1-3% magnification, compared with about 7-10% for contact lenses and 25-33% for spectacles.

Question 9: A patient looks at an object through a prism. Which way does the image appear to move?

Toward the base of the prism
Perpendicular to the base-apex line
Toward the apex of the prism (Correct answer)
It does not move

Correct answer: Toward the apex of the prism

A prism bends light toward its base, so the image appears shifted toward the apex.

Question 10: A 30-year-old patient is diagnosed with active herpes simplex virus (HSV) epithelial keratitis, characterized by a well-defined dendritic ulcer with terminal bulbs that stains with fluorescein. Which of the following interventions is strictly contraindicated in the management of this patient?

Topical ganciclovir gel
Corneal debridement
Oral valacyclovir
Topical prednisolone acetate (Correct answer)

Correct answer: Topical prednisolone acetate

The use of topical corticosteroids, such as prednisolone acetate, is absolutely contraindicated in active HSV epithelial keratitis. Steroids suppress the local immune response, which can lead to increased viral replication, enlargement of the epithelial defect into a "geographic ulcer," and a heightened risk of stromal melting and perforation. Management should focus on antiviral therapy, either topical (ganciclovir) or oral (valacyclovir), with debridement being an occasional adjunct.

Question 11: A 35-year-old male presents with progressive, painless blurring of vision. Refraction reveals high against-the-rule astigmatism. Corneal topography shows a narrow band of inferior thinning from the 4 o'clock to the 8 o'clock position, located 1-2 mm from the limbus, with steepening of the cornea just superior to this band. The central cornea is of normal thickness. This presentation is most characteristic of which condition?

Posterior Keratoconus
Central (nipple cone) Keratoconus
Keratoglobus
Pellucid Marginal Degeneration (Correct answer)

Correct answer: Pellucid Marginal Degeneration

This description is the classic presentation of Pellucid Marginal Degeneration (PMD). Key features are the peripheral band of inferior thinning (typically 4 to 8 o'clock) located 1-2 mm from the limbus, with the area of maximum protrusion occurring just superior to the thinned area, leading to high against-the-rule astigmatism. This creates a characteristic "crab claw" or "kissing doves" appearance on topography. Keratoconus typically involves central or paracentral thinning and protrusion, while keratoglobus involves global corneal thinning.

Question 12: A 24-year-old soft contact lens wearer presents with severe right eye pain that is disproportionate to clinical signs. Slit-lamp examination reveals a stromal ring infiltrate and radial keratoneuritis. What is the most specific diagnostic modality to confirm the suspected diagnosis?

Polymerase chain reaction (PCR) for viral DNA
Specular microscopy of the endothelium
Corneal scraping with Gram stain and culture
In vivo confocal microscopy (Correct answer)

Correct answer: In vivo confocal microscopy

The clinical presentation of severe pain out of proportion to signs, a ring infiltrate, and radial keratoneuritis in a contact lens wearer is highly suggestive of Acanthamoeba keratitis. In vivo confocal microscopy is a rapid, non-invasive imaging technique that allows for the direct visualization of Acanthamoeba cysts and trophozoites within the corneal stroma, providing a highly specific and timely diagnosis. While corneal scraping for culture is a gold standard, it can have low sensitivity and takes a long time. PCR is sensitive but not as specific for direct visualization. Specular microscopy is used to evaluate the endothelium.

Question 13: A patient is looking through their +5.00 D spherical lens at a point 6 mm below the optical center. Using Prentice's rule, what is the magnitude and direction of the induced prism?

1.5 prism diopters, base down
3.0 prism diopters, base up (Correct answer)
1.5 prism diopters, base up
3.0 prism diopters, base down

Correct answer: 3.0 prism diopters, base up

Prentice's rule states that the prismatic effect (P) in prism diopters is equal to the lens power in diopters (D) multiplied by the decentration in centimeters (c). Here, D = +5.00 D and c = 6 mm = 0.6 cm. P = 5.00 * 0.6 = 3.0 prism diopters. For a plus lens, the base of the prism is always towards the optical center. Since the patient is looking below the optical center, the induced prism is base up. [1, 14, 23]

Question 14: Which surgical procedure involves selective transplantation of the posterior stroma, Descemet membrane, and endothelium while leaving the recipient's anterior stroma intact?

Descemet stripping automated endothelial keratoplasty (DSAEK) (Correct answer)
Deep anterior lamellar keratoplasty (DALK)
Descemet membrane endothelial keratoplasty (DMEK)
Penetrating keratoplasty (PKP)

Correct answer: Descemet stripping automated endothelial keratoplasty (DSAEK)

DSAEK involves transplanting a posterior lamellar graft consisting of posterior stroma, Descemet membrane, and endothelium, making it ideal for endothelial dysfunction with a healthy anterior cornea.

Question 15: About what pinhole diameter gives the best acuity when screening for uncorrected refractive error?

About 6.0 mm
About 4.0 mm
About 1.2 mm (Correct answer)
About 0.3 mm

Correct answer: About 1.2 mm

A pinhole of about 1.2 mm balances a smaller blur circle against increasing diffraction and reduced light.

Question 16: A 58-year-old patient presents with an intraocular pressure of 34 mmHg, a cup-to-disc ratio of 0.8, and nasal step visual field defect. Which initial medical therapy is most appropriate?

Intravitreal anti-VEGF injection
Topical prostaglandin analog (Correct answer)
Topical pilocarpine
Oral acetazolamide

Correct answer: Topical prostaglandin analog

Topical prostaglandin analogs such as latanoprost are first-line therapy for primary open-angle glaucoma due to their efficacy and once-daily dosing.

Question 17: What is the approximate optimal pinhole diameter for clinical testing of potential visual acuity?

1.2 mm (Correct answer)
5.0 mm
3.0 mm
0.3 mm

Correct answer: 1.2 mm

A pinhole of about 1.2 mm balances reduced blur circle size against increasing diffraction at smaller apertures.

Question 18: A patient undergoes trabeculectomy and presents on postoperative day 2 with a shallow anterior chamber, low IOP, and a large diffuse bleb. What is the most likely cause?

Suprachoroidal hemorrhage
Bleb leak
Aqueous misdirection
Overfiltration (Correct answer)

Correct answer: Overfiltration

A shallow chamber with low IOP and a large bleb in the early postoperative period is most consistent with overfiltration through the sclerostomy.

Question 19: What is the target IOP reduction percentage generally recommended as initial therapy for a patient newly diagnosed with primary open-angle glaucoma?

5-10% reduction from baseline
20-30% reduction from baseline (Correct answer)
No specific target, treat only if visual field worsens
50-60% reduction from baseline

Correct answer: 20-30% reduction from baseline

Major clinical trials including the OHTS and EMGT established that an initial 20-30% IOP reduction from baseline significantly reduces the risk of glaucomatous progression.

Question 20: Which optical instrument is commonly used to determine refractive errors?

Otoscope
Tonometer
Phoropter (Correct answer)
Slit lamp

Correct answer: Phoropter

Keratoconus is a progressive eye condition where the cornea, the clear front surface of the eye, thins and gradually bulges outward into a cone shape. This irregular curvature distorts vision, causing blurriness and light sensitivity. It often requires specialized contact lenses or surgical intervention for management.

Question 21: What is the recommended initial treatment for zone 1 retinopathy of prematurity (ROP) with plus disease?

Intravitreal anti-VEGF injection (Correct answer)
Cryotherapy to the avascular retina
Pars plana vitrectomy with lensectomy
Observation with serial examinations

Correct answer: Intravitreal anti-VEGF injection

Intravitreal anti-VEGF injection has become the preferred first-line treatment for zone 1 ROP with plus disease due to superior structural outcomes compared to laser in this posterior location.

Question 22: A patient presents with a right homonymous hemianopia that is denser superiorly (pie-in-the-sky defect). Where is the most likely location of the lesion?

Right parietal lobe
Left occipital cortex
Left temporal lobe (Meyer's loop) (Correct answer)
Right temporal lobe (Meyer's loop)

Correct answer: Left temporal lobe (Meyer's loop)

A right homonymous superior quadrantanopia (pie-in-the-sky) localizes to the left temporal lobe where Meyer's loop carries inferior retinal fibers representing the superior visual field.

Question 23: Which type of multifocal IOL design uses concentric rings of alternating distance and near focal zones to split incoming light?

Accommodating IOL
Diffractive multifocal (Correct answer)
Extended depth of focus
Refractive multifocal

Correct answer: Diffractive multifocal

Diffractive multifocal IOLs use concentric ring steps on the lens surface to create constructive interference patterns that split light between distance and near foci.

Question 24: Which investigation is most important before performing strabismus surgery in a child with a recently acquired esotropia and no clear accommodative component?

Electroretinography
CT orbits
Genetic testing for CFEOM
MRI brain with attention to posterior fossa (Correct answer)

Correct answer: MRI brain with attention to posterior fossa

Acquired non-accommodative esotropia in a child warrants MRI of the brain to rule out posterior fossa pathology such as Chiari malformation or tumor.

Question 25: Which corneal dystrophy is characterized by recurrent erosions beginning in the first decade of life and demonstrates map-dot-fingerprint patterns on slit lamp examination?

Reis-Bücklers dystrophy
Epithelial basement membrane dystrophy (Correct answer)
Meesmann dystrophy
Lattice dystrophy type I

Correct answer: Epithelial basement membrane dystrophy

Epithelial basement membrane dystrophy (EBMD/Cogan's) is the most common anterior corneal dystrophy, characterized by map-like gray patches, microcysts (dots), and fingerprint lines.

Question 26: A patient develops ipsilateral ptosis, miosis, and anhidrosis following carotid artery dissection. Which pathway is disrupted?

Sympathetic pathway to the eye (Correct answer)
Abducens nerve (CN VI)
Oculomotor nerve (CN III)
Trochlear nerve (CN IV)

Correct answer: Sympathetic pathway to the eye

Horner syndrome results from disruption of the sympathetic pathway; carotid artery dissection affects the postganglionic fibers that travel with the internal carotid artery.

Question 27: What optical thickness does a single-layer anti-reflective coating need for destructive interference of reflected light?

One-half wavelength
One full wavelength
One-quarter wavelength (Correct answer)
Two wavelengths

Correct answer: One-quarter wavelength

A quarter-wave coating makes the two reflected waves differ by half a wavelength in path, so they cancel.

Question 28: A patient presents with a unilateral, chronic, red eye with a strawberry-like papillary reaction on the upper tarsal conjunctiva. What is the most likely diagnosis?

Vernal keratoconjunctivitis
Floppy eyelid syndrome
Giant papillary conjunctivitis (Correct answer)
Trachoma

Correct answer: Giant papillary conjunctivitis

Giant papillary conjunctivitis is characterized by large cobblestone-like papillae on the upper tarsal conjunctiva, commonly associated with contact lens wear or ocular prostheses.

Question 29: A patient undergoes keratometry revealing readings of 44.00 D at 90 degrees and 42.00 D at 180 degrees. What is the type and amount of corneal astigmatism?

2.00 D with-the-rule astigmatism (Correct answer)
1.00 D with-the-rule astigmatism
2.00 D oblique astigmatism
2.00 D against-the-rule astigmatism

Correct answer: 2.00 D with-the-rule astigmatism

The steeper meridian at 90 degrees with 2.00 D difference defines with-the-rule corneal astigmatism.

Question 30: A 25-year-old presents with bilateral band-shaped corneal opacities in the interpalpebral zone at the level of Bowman layer. Serum calcium is elevated. What is the most likely diagnosis?

Climatic droplet keratopathy
Spheroidal degeneration
Band keratopathy (Correct answer)
Salzmann nodular degeneration

Correct answer: Band keratopathy

Band keratopathy is caused by calcium hydroxyapatite deposition in Bowman layer and the superficial stroma, often associated with hypercalcemia, chronic uveitis, or ocular surface disease.

Question 31: A patient undergoes automated perimetry which reveals a bitemporal hemianopia that respects the vertical midline. A lesion at which of the following locations would best explain this visual field defect?

Optic chiasm (Correct answer)
Optic tract
Occipital cortex
Optic nerve

Correct answer: Optic chiasm

The optic chiasm is the location where the nasal retinal fibers from each eye, which are responsible for the temporal visual fields, cross to the opposite side of the brain. A compressive lesion at the chiasm, most commonly a pituitary adenoma, will damage these crossing fibers, resulting in a loss of vision in the temporal fields of both eyes, known as a bitemporal hemianopia. Lesions of the optic nerve cause monocular field defects, while lesions posterior to the chiasm (optic tract, occipital cortex) cause homonymous hemianopias (affecting the same side of the visual field in both eyes).

Question 32: A 35-year-old woman presents with complaints of intermittent, brief episodes of vertical and torsional oscillopsia in her right eye, which she describes as 'shimmering' or 'trembling.' The episodes last for seconds at a time and are more frequent when she is tired. Her examination is normal between episodes, but during a symptomatic period, you observe a high-frequency, low-amplitude torsional movement of the right eye. What is the most likely diagnosis?

Sixth nerve palsy
Nystagmus
Superior oblique myokymia (Correct answer)
Ocular neuromyotonia

Correct answer: Superior oblique myokymia

Superior oblique myokymia (SOM) is a rare disorder characterized by monocular, high-frequency, low-amplitude contractions of the superior oblique muscle. This results in the classic symptoms of episodic, brief vertical and torsional oscillopsia. It typically affects healthy young to middle-aged adults. Nystagmus is typically conjugate (involving both eyes), ocular neuromyotonia involves sustained muscle contraction, and a sixth nerve palsy would present with an abduction deficit, not oscillatory movements.

Question 33: A 55-year-old woman with a history of hyperthyroidism presents with chronic irritation, redness, and a foreign body sensation in both eyes. Examination reveals papillary hypertrophy of the superior tarsal conjunctiva, inflammation and redundancy of the superior bulbar conjunctiva, and fine punctate staining of the superior cornea. What is the most likely diagnosis?

Trachoma
Superior Limbic Keratoconjunctivitis (SLK) (Correct answer)
Ocular Cicatricial Pemphigoid
Vernal keratoconjunctivitis

Correct answer: Superior Limbic Keratoconjunctivitis (SLK)

Superior Limbic Keratoconjunctivitis (SLK) is characterized by inflammation specifically affecting the superior bulbar and tarsal conjunctiva. The constellation of findings described is classic for SLK, which has a strong association with thyroid eye disease, particularly hyperthyroidism. [3, 19, 26, 29, 30] The other conditions have different characteristic signs and locations of involvement.

Question 34: A patient with proliferative diabetic retinopathy develops tractional retinal detachment involving the macula. What is the most appropriate management?

Intravitreal anti-VEGF injection alone
Panretinal photocoagulation
Pars plana vitrectomy (Correct answer)
Observation with serial imaging

Correct answer: Pars plana vitrectomy

Tractional retinal detachment involving the macula requires pars plana vitrectomy to relieve traction and reattach the retina to preserve central vision.

Question 35: What is the spherical equivalent of +2.00 -3.00 x 090?

-1.00 D
+0.50 D (Correct answer)
+3.50 D
-0.50 D

Correct answer: +0.50 D

Spherical equivalent is the sphere plus half the cylinder: +2.00 + (-1.50) = +0.50 D.

Question 36: A 2-year-old presents with leukocoria in the right eye. What is the most important diagnosis to rule out first?

Congenital cataract
Persistent fetal vasculature
Coats disease
Retinoblastoma (Correct answer)

Correct answer: Retinoblastoma

Retinoblastoma must be excluded first in any child presenting with leukocoria because delayed diagnosis is potentially life-threatening.

Question 37: A child with retinoblastoma develops secondary esotropia in the affected eye. What is the underlying mechanism?

Increased intraocular pressure restricting motility
Sensory deprivation disrupting fusion (Correct answer)
Direct infiltration of the medial rectus
Cranial nerve III palsy from tumor extension

Correct answer: Sensory deprivation disrupting fusion

Loss of central vision from retinoblastoma causes sensory deprivation strabismus, most commonly esotropia.

Question 38: Where is the circle of least confusion in an astigmatic conoid of Sturm?

At the dioptric midpoint between the two focal lines (Correct answer)
At the anterior focal line
At the posterior focal line
Always on the retina

Correct answer: At the dioptric midpoint between the two focal lines

The circle of least confusion is at the dioptric midpoint of the interval of Sturm, which corresponds to the spherical equivalent.

Question 39: A 72-year-old patient is seen on postoperative day 1 after Descemet's Membrane Endothelial Keratoplasty (DMEK). The cornea is edematous, and a large, partially detached but correctly oriented graft is noted in the anterior chamber. What is the most appropriate next step in management?

Perform a rebubbling procedure with air or gas (Correct answer)
Prescribe topical hypertonic saline and observe for one week
Proceed immediately with a full-thickness penetrating keratoplasty (PKP)
Start high-dose oral corticosteroids to reduce inflammation

Correct answer: Perform a rebubbling procedure with air or gas

A large, clinically significant graft detachment is the most common complication after DMEK and requires intervention. The standard of care is to perform a "rebubbling" procedure, which involves injecting an air or gas bubble into the anterior chamber to push the graft back into apposition with the host stroma. This is often successful and avoids the need for a more invasive procedure. Proceeding to PKP is overly aggressive. Observation or medical management alone is insufficient for a large mechanical detachment.

Question 40: In Gullstrand's schematic eye, what is the approximate total refractive power of the eye?

+63.0 D
+58.6 D (Correct answer)
+43.0 D
+20.0 D

Correct answer: +58.6 D

Gullstrand's schematic eye has a total refractive power of approximately +58.6 diopters combining corneal and lenticular contributions.

Question 41: A premature infant born at 26 weeks gestational age undergoes retinopathy of prematurity screening. Zone I, stage 3 disease with plus disease is identified. What is the appropriate management?

Cryotherapy to the avascular retina
Vitrectomy with scleral buckle
Observation with follow-up in one week
Treatment within 72 hours with laser photocoagulation or intravitreal anti-VEGF (Correct answer)

Correct answer: Treatment within 72 hours with laser photocoagulation or intravitreal anti-VEGF

Zone I ROP with plus disease meets criteria for type 1 ROP per the ETROP study, requiring treatment within 72 hours with laser photocoagulation or intravitreal anti-VEGF.

Question 42: A patient presents with a shield ulcer at the superior cornea associated with giant papillae on the upper tarsal conjunctiva. Which condition is most likely responsible?

Bacterial keratitis
Exposure keratopathy
Neurotrophic keratopathy
Vernal keratoconjunctivitis (Correct answer)

Correct answer: Vernal keratoconjunctivitis

Shield ulcers are a hallmark complication of vernal keratoconjunctivitis, caused by mechanical trauma from giant papillae and inflammatory mediators on the superior corneal epithelium.

Question 43: Which symptom is associated with vitreous hemorrhage?

Sudden appearance of floaters (Correct answer)
Itching
Eye redness
Painful eye

Correct answer: Sudden appearance of floaters

Sudden vision loss with floaters is a key sign of vitreous hemorrhage, often related to diabetic eye disease or trauma.

Question 44: A patient presents with recurrent episodes of markedly elevated intraocular pressure (40–60 mmHg) with minimal anterior chamber cells or flare, and unilateral corneal edema. What is the most likely diagnosis?

Fuchs heterochromic iridocyclitis
Ankylosing spondylitis–associated uveitis
Behçet disease
Posner-Schlossman syndrome (glaucomatocyclitic crisis) (Correct answer)

Correct answer: Posner-Schlossman syndrome (glaucomatocyclitic crisis)

Posner-Schlossman syndrome presents with recurrent unilateral episodes of markedly elevated IOP with minimal anterior chamber inflammation, often with mild corneal edema.

Question 45: What is the primary symptom of dry eye disease?

Itchy scalp
Sudden vision loss
Double vision
Gritty or burning sensation (Correct answer)

Correct answer: Gritty or burning sensation

Pseudomonas aeruginosa is a highly aggressive bacterium frequently implicated in severe contact lens-related keratitis. This microorganism can rapidly cause corneal ulcers and significant vision loss due to its ability to adhere to contact lenses and produce damaging toxins. Prompt diagnosis and treatment are crucial to prevent serious complications.

Question 46: Which aberration causes a point source of light to appear as a comet-shaped blur when imaged through the peripheral portion of a spherical lens?

Coma (Correct answer)
Chromatic aberration
Distortion
Spherical aberration

Correct answer: Coma

Coma produces an asymmetric, comet-shaped blur pattern for off-axis point sources passing through different lens zones.

Question 47: What is the most common cause of vitreous hemorrhage in adults in the United States?

Retinal tear
Trauma
Proliferative diabetic retinopathy (Correct answer)
Posterior vitreous detachment

Correct answer: Proliferative diabetic retinopathy

Proliferative diabetic retinopathy is the leading cause of vitreous hemorrhage in US adults due to bleeding from fragile neovascular vessels.

Question 48: The remarkable transparency and high refractive index of the human crystalline lens are primarily maintained by a high concentration of which family of water-soluble structural proteins?

Collagens
Crystallins (Correct answer)
Albumins
Globulins

Correct answer: Crystallins

The crystalline lens is composed of approximately 60% protein, and 90% of these water-soluble proteins are crystallins (alpha, beta, and gamma). These proteins are arranged in a highly ordered, short-range structure that minimizes light scatter, thereby ensuring lens transparency.

Question 49: How is the transmission axis of polarized sunglasses oriented to reduce glare from horizontal surfaces such as water?

Circularly polarized
Horizontally
At 45 degrees
Vertically (Correct answer)

Correct answer: Vertically

Light reflected from horizontal surfaces is mainly horizontally polarized, so a vertical transmission axis blocks it.

Question 50: A patient with thyroid eye disease presents with restricted upgaze and elevated intraocular pressure on upgaze. Which extraocular muscle is most commonly affected in this condition?

Medial rectus
Lateral rectus
Superior rectus
Inferior rectus (Correct answer)

Correct answer: Inferior rectus

The inferior rectus is the most commonly affected extraocular muscle in thyroid eye disease, and its fibrotic enlargement restricts upgaze and increases IOP in that gaze position.

Question 51: A 5-year-old undergoes surgery for inferior oblique overaction. Which procedure is most commonly performed?

Superior oblique tuck
Inferior rectus recession
Inferior oblique recession or myectomy (Correct answer)
Inferior oblique resection

Correct answer: Inferior oblique recession or myectomy

Inferior oblique weakening via recession or myectomy is the standard procedure for symptomatic inferior oblique overaction.

Question 52: Which condition is most commonly associated with dissociated vertical deviation (DVD)?

Intermittent exotropia
Brown syndrome
Duane retraction syndrome
Infantile esotropia (Correct answer)

Correct answer: Infantile esotropia

DVD is strongly associated with infantile esotropia and occurs in up to 90% of cases over time.

Question 53: What is the hallmark finding on slit-lamp examination in lattice corneal dystrophy type I?

Dense white granular deposits in Bowman layer
Refractile branching lines in the anterior stroma (Correct answer)
Central geographic iron deposits
Diffuse posterior stromal haze

Correct answer: Refractile branching lines in the anterior stroma

Lattice dystrophy type I (TGFBI mutation) is characterized by refractile branching amyloid deposits in the anterior and mid-stroma.

Question 54: Which corneal dystrophy is characterized by bilateral, progressive, asymmetric corneal ectasia with iron deposition in the epithelium forming a Fleischer ring?

Granular corneal dystrophy
Posterior polymorphous corneal dystrophy
Fuchs endothelial corneal dystrophy
Keratoconus (Correct answer)

Correct answer: Keratoconus

Keratoconus is defined by progressive corneal thinning and ectasia with classic signs including Vogt striae, Fleischer ring (hemosiderin deposits), and Munson sign.

Question 55: Which unit measures the refractive power of a lens?

Diopter (Correct answer)
Lumen
Lux
Candela

Correct answer: Diopter

The diopter is the standard unit used to measure the refractive power of a lens. It is defined as the reciprocal of the focal length in meters. A higher diopter value indicates a stronger lens that bends light more significantly, making it crucial for prescribing corrective eyewear.

Question 56: What is the critical period for amblyopia treatment in most children?

Birth to 7-8 years (Correct answer)
Birth to 2 years
Birth to 18 years
Birth to 12 years

Correct answer: Birth to 7-8 years

The visual system remains plastic and responsive to amblyopia treatment until approximately age 7-8 years, though some benefit may extend beyond this.

Question 57: Which of the following is the LEAST established independent risk factor for the development of age-related cataracts?

Systemic hypertension (Correct answer)
Myopia
Diabetes mellitus
Chronic ultraviolet light exposure

Correct answer: Systemic hypertension

While diabetes, chronic UV exposure, and myopia are all well-established independent risk factors for cataract formation, the association with systemic hypertension is less direct and not as strongly supported as an independent risk factor in many large-scale studies. Often, its association is confounded by other co-existing conditions like diabetes.

Question 58: A patient looks through a -4.00 D lens at a point 5 mm from its optical center. How much prism is induced?

20 prism diopters
0.8 prism diopters
1.25 prism diopters
2 prism diopters (Correct answer)

Correct answer: 2 prism diopters

Prentice's rule gives prism = decentration in cm x power in diopters, so 0.5 x 4 = 2 prism diopters.

Question 59: A patient with a cycloplegic refraction of +5.00 D requires a spectacle lens at a vertex distance of 12 mm. What is the effective power at the corneal plane?

+5.00 D
+4.72 D
+4.50 D
+5.31 D (Correct answer)

Correct answer: +5.31 D

Using the effectivity formula, the effective power at a shorter vertex distance increases for plus lenses: +5.00 / (1 - 0.012 x 5.00) = +5.31 D.

Question 60: What is the recommended first-line treatment for herpes simplex virus epithelial (dendritic) keratitis?

Oral doxycycline
Topical corticosteroids alone
Topical natamycin
Topical ganciclovir or oral valacyclovir (Correct answer)

Correct answer: Topical ganciclovir or oral valacyclovir

HSV epithelial keratitis is treated with topical antivirals (ganciclovir gel) or oral antivirals (valacyclovir/acyclovir) to reduce viral replication.

Question 61: A Galilean telescope uses a +5.00 D objective and a -20.00 D eyepiece. What is the separation between the lenses?

20 cm
5 cm
25 cm
15 cm (Correct answer)

Correct answer: 15 cm

The tube length equals the sum of focal lengths: 20 cm + (-5 cm) = 15 cm.

Question 62: In a patient with pseudoexfoliation glaucoma, which characteristic finding is seen on slit-lamp examination?

Posterior synechiae without prior inflammation
Pigment dispersion on the corneal endothelium in a Krukenberg spindle pattern
Neovascularization of the iris
White flaky material on the anterior lens capsule (Correct answer)

Correct answer: White flaky material on the anterior lens capsule

Pseudoexfoliation glaucoma is characterized by white, dandruff-like fibrillar material deposited on the anterior lens capsule and pupillary margin.

Question 63: A patient presents with bilateral internuclear ophthalmoplegia (INO). In a young adult, what is the most common etiology?

Brainstem glioma
Myasthenia gravis
Multiple sclerosis (Correct answer)
Brainstem stroke

Correct answer: Multiple sclerosis

Bilateral INO in a young adult is highly suggestive of multiple sclerosis due to demyelinating lesions in the medial longitudinal fasciculus.

Question 64: Which type of intraocular lens (IOL) is most appropriate for a patient with significant corneal astigmatism undergoing cataract surgery?

Monofocal IOL
Multifocal IOL
Toric IOL (Correct answer)
Accommodating IOL

Correct answer: Toric IOL

Toric IOLs are specifically designed to correct pre-existing corneal astigmatism at the time of cataract surgery.

Question 65: A 58-year-old woman with newly diagnosed, mild primary open-angle glaucoma (POAG) and ocular hypertension is treatment-naïve. According to the 6-year results of the Laser in Glaucoma and Ocular Hypertension (LiGHT) trial, which of the following is the most appropriate initial treatment to offer this patient for better long-term disease control and a lower rate of progression?

A topical prostaglandin analog
A topical beta-blocker
Immediate trabeculectomy
Selective Laser Trabeculoplasty (SLT) (Correct answer)

Correct answer: Selective Laser Trabeculoplasty (SLT)

The LiGHT trial's 6-year results demonstrated that initial treatment with Selective Laser Trabeculoplasty (SLT) was associated with better long-term disease control, a slower rate of visual field progression, and a reduced need for subsequent incisional surgery compared to initial treatment with IOP-lowering eye drops. For a treatment-naïve patient, SLT is therefore recommended as a first-line intervention.

Question 66: What is the Parks-Bielschowsky three-step test used to diagnose?

Horizontal rectus muscle palsies
Convergence insufficiency
Cyclovertical muscle palsies (Correct answer)
Accommodative esotropia

Correct answer: Cyclovertical muscle palsies

The three-step test systematically isolates which cyclovertical muscle is paretic by evaluating hyperdeviation in different gaze positions and head tilts.

Question 67: What is the Prentice rule formula for calculating prismatic effect?

Prism (PD) = decentration (cm) x lens power (D) (Correct answer)
Prism (PD) = decentration (mm) x lens power (D)
Prism (PD) = decentration (cm) + lens power (D)
Prism (PD) = lens power (D) / decentration (cm)

Correct answer: Prism (PD) = decentration (cm) x lens power (D)

The Prentice rule states that prismatic effect in prism diopters equals the decentration in centimeters multiplied by the lens power in diopters.

Question 68: A patient with a history of herpes simplex keratitis develops a deep stromal infiltrate without epithelial defect. What is the recommended first-line treatment?

Oral valacyclovir alone
Topical corticosteroid with oral antiviral prophylaxis (Correct answer)
Topical acyclovir alone
Topical antiviral with cycloplegia only

Correct answer: Topical corticosteroid with oral antiviral prophylaxis

Herpetic stromal keratitis without epithelial involvement is treated with topical corticosteroids to suppress the immune-mediated inflammation, combined with oral antiviral prophylaxis to prevent viral reactivation.

Question 69: Which finding on OCT is most characteristic of central serous chorioretinopathy?

Intraretinal cystoid spaces with hard exudates
Epiretinal membrane with retinal folds
Full-thickness macular hole with operculum
Neurosensory retinal detachment with subretinal fluid (Correct answer)

Correct answer: Neurosensory retinal detachment with subretinal fluid

Central serous chorioretinopathy classically presents on OCT as a dome-shaped neurosensory retinal detachment with an optically clear space of subretinal fluid.

Question 70: A patient with high myopia presents with a gradually progressive visual field defect. Fundoscopy reveals a peripapillary crescent and posterior staphyloma. What retinal complication is this patient most at risk for?

Central serous chorioretinopathy
Macular hole from epiretinal membrane
Proliferative vitreoretinopathy
Myopic macular schisis and foveal detachment (Correct answer)

Correct answer: Myopic macular schisis and foveal detachment

High myopia with posterior staphyloma predisposes to myopic traction maculopathy including macular schisis and foveal detachment due to mechanical stretching forces.

Question 71: Which minimally invasive glaucoma surgery (MIGS) device is placed in Schlemm's canal to enhance conventional aqueous outflow?

Ahmed glaucoma valve
Xen gel stent
Ex-PRESS shunt
iStent (Correct answer)

Correct answer: iStent

The iStent is a trabecular micro-bypass stent placed into Schlemm's canal to improve physiologic aqueous outflow.

Question 72: What is the target IOP reduction generally recommended as an initial goal for newly diagnosed primary open-angle glaucoma?

20-30% from baseline (Correct answer)
Reduction to single digits regardless of baseline
40-50% from baseline
10-15% from baseline

Correct answer: 20-30% from baseline

A 20-30% reduction from baseline IOP is the standard initial target recommended by major glaucoma trials including the OHTS and EMGT.

Question 73: Which corneal dystrophy is associated with mutations in the TGFBI gene on chromosome 5q31 and presents with granular opacities in the anterior stroma?

Macular corneal dystrophy
Posterior polymorphous corneal dystrophy
Granular corneal dystrophy type I (classic) (Correct answer)
Congenital hereditary endothelial dystrophy

Correct answer: Granular corneal dystrophy type I (classic)

Granular dystrophy type I is caused by TGFBI mutations and features discrete, crumb-like hyaline deposits in the anterior central stroma with clear intervening spaces.

Question 74: In a patient receiving long-term systemic corticosteroids for uveitis, which ocular complication is most characteristic of steroid use?

Anterior subcapsular cataract
Nuclear sclerotic cataract
Cortical cataract
Posterior subcapsular cataract (Correct answer)

Correct answer: Posterior subcapsular cataract

Posterior subcapsular cataracts (PSC) are the classic ocular complication of both systemic and topical corticosteroid use, developing in a dose- and duration-dependent manner.

Question 75: When using a Jackson cross cylinder to refine the cylinder axis, how should the cross cylinder be placed?

Its minus axis is aligned with the trial cylinder axis
Its plus axis is aligned with the trial cylinder axis
Its handle is perpendicular to the trial cylinder axis
Its principal meridians straddle the trial cylinder axis at 45 degrees (Correct answer)

Correct answer: Its principal meridians straddle the trial cylinder axis at 45 degrees

For axis refinement, the handle lines up with the cylinder axis, which puts the cross cylinder's principal meridians 45 degrees on either side of it.

Question 76: A patient presents with bilateral granulomatous panuveitis, sunset glow fundus, vitiligo, poliosis, and alopecia. What is the most likely diagnosis?

Sympathetic ophthalmia
Vogt-Koyanagi-Harada syndrome (Correct answer)
Sarcoidosis
Behçet disease

Correct answer: Vogt-Koyanagi-Harada syndrome

VKH syndrome is characterized by bilateral granulomatous uveitis, sunset glow fundus from choroidal depigmentation, and extraocular findings including vitiligo, poliosis, and alopecia.

Question 77: What is the most common organism causing bacterial keratitis in contact lens wearers in the United States?

Staphylococcus aureus
Moraxella catarrhalis
Pseudomonas aeruginosa (Correct answer)
Streptococcus pneumoniae

Correct answer: Pseudomonas aeruginosa

Pseudomonas aeruginosa is the most common cause of contact lens-related bacterial keratitis, producing a rapidly progressive suppurative ulcer.

Question 78: A patient wearing a +10.00 D aphakic spectacle correction at a vertex distance of 12 mm requires what equivalent contact lens power?

+11.40 D (Correct answer)
+8.93 D
+10.00 D
+12.50 D

Correct answer: +11.40 D

Using the vertex distance formula, moving a plus lens closer to the eye requires increasing its power, yielding approximately +11.40 D.

Question 79: What is the primary advantage of femtosecond laser-assisted cataract surgery (FLACS) compared to conventional phacoemulsification?

Significantly shorter operative time
Elimination of all surgical complications
Lower overall cost per procedure
More precise and reproducible capsulotomy (Correct answer)

Correct answer: More precise and reproducible capsulotomy

Femtosecond laser creates a more precise, centered, and reproducible capsulotomy compared to manual continuous curvilinear capsulorhexis.

Question 80: A patient with a keratometry reading of 44.00 D in one meridian and 46.00 D in the perpendicular meridian has what type and amount of corneal astigmatism?

2.00 D against-the-rule astigmatism
2.00 D with-the-rule astigmatism (Correct answer)
4.00 D irregular astigmatism
2.00 D oblique astigmatism

Correct answer: 2.00 D with-the-rule astigmatism

The 2.00 D difference between meridians with the steeper curvature at 90 degrees indicates with-the-rule astigmatism.

Question 81: What is the conventional magnification of a +20.00 D simple hand magnifier?

2x
10x
5x (Correct answer)
20x

Correct answer: 5x

Conventional magnification of a simple magnifier is D/4, so 20/4 = 5x.

Question 82: A newborn is found to have bilateral white pupillary reflexes. After ruling out retinoblastoma, lens examination reveals dense bilateral cataracts. Which inherited metabolic disorder should be evaluated first?

Fabry disease
Wilson disease
Marfan syndrome
Galactosemia (Correct answer)

Correct answer: Galactosemia

Galactosemia is a critical metabolic cause of bilateral congenital cataracts that requires urgent dietary intervention to prevent systemic complications.

Question 83: A myopic patient has a far point located 25 cm in front of the eye. What corrective lens power is needed at the spectacle plane (assuming negligible vertex distance)?

-6.00 D
-0.25 D
-2.50 D
-4.00 D (Correct answer)

Correct answer: -4.00 D

The corrective lens must have a focal length equal to the far point distance, so power = -1/0.25 m = -4.00 D.

Question 84: Which nerve is at greatest risk of injury during lower eyelid blepharoplasty?

Lacrimal nerve
Facial nerve (marginal mandibular branch)
Infraorbital nerve (Correct answer)
Supratrochlear nerve

Correct answer: Infraorbital nerve

The infraorbital nerve exits the infraorbital foramen just inferior to the orbital rim and is at risk of injury during lower eyelid or midface procedures.

Question 85: A 6-year-old child presents with a complaint of an abnormal head posture, specifically a chin-up position. On examination, there is a marked limitation of elevation of the left eye when it is in the adducted position (looking up and to the right). Elevation in abduction is normal. What is the most likely diagnosis?

Duane retraction syndrome Type 2
Brown syndrome (Correct answer)
Inferior oblique palsy
Superior rectus palsy

Correct answer: Brown syndrome

Brown syndrome is characterized by a restrictive strabismus due to a tight or inelastic superior oblique tendon. The hallmark clinical sign is a limitation of elevation in adduction. Patients are often orthotropic in primary position but may adopt a chin-up head posture to maintain binocularity and avoid the field of restriction.

Question 86: A 72-year-old patient with a mature white cataract undergoes phacoemulsification. During surgery, the capsular bag is noted to have significant zonular weakness. Which device is most appropriate to stabilize the capsular bag?

Capsular tension ring (Correct answer)
Anterior vitrectomy cutter
Ahmed glaucoma valve
Iris retractor hooks

Correct answer: Capsular tension ring

A capsular tension ring redistributes zonular stress and stabilizes the capsular bag during phacoemulsification in eyes with zonular weakness.

Question 87: Which of the following corneal dystrophies is NOT associated with a mutation in the Transforming Growth Factor Beta Induced (TGFB1) gene?

Reis-Bücklers Corneal Dystrophy
Granular Corneal Dystrophy, Type I
Macular Corneal Dystrophy (Correct answer)
Lattice Corneal Dystrophy, Type I

Correct answer: Macular Corneal Dystrophy

Macular Corneal Dystrophy is an autosomal recessive disorder caused by mutations in the Carbohydrate Sulfotransferase 6 (CHST6) gene, which leads to abnormal synthesis of keratan sulfate. [6, 7, 9, 13] In contrast, Granular, Lattice, Reis-Bücklers, and Avellino dystrophies are all autosomal dominant conditions associated with various mutations in the TGFB1 gene on chromosome 5q31. [25, 27, 35]

Question 88: During the duochrome (red-green) test, a patient reports the letters on the red side are clearer. What is the appropriate adjustment?

Rotate the cylinder axis
Add minus sphere (Correct answer)
Add plus sphere
Increase cylinder power

Correct answer: Add minus sphere

Red clearer means the focal points lie anterior to the retina (relative myopia), so more minus power is needed.

Question 89: A child with intermittent exotropia who maintains alignment most of the day but deviates when tired or daydreaming is best classified as having which subtype?

Divergence excess type
Simulated divergence excess type
Convergence insufficiency type
Basic type (Correct answer)

Correct answer: Basic type

Basic intermittent exotropia shows a similar deviation at distance and near and is the most common subtype.

Question 90: A 68-year-old patient with non-exudative age-related macular degeneration (AMD) asks about nutritional supplements. According to the AREDS2 study, which formulation is most appropriate to recommend for reducing the risk of progression to advanced AMD?

Vitamin C, Vitamin E, lutein, zeaxanthin, zinc, and copper. (Correct answer)
High-dose Vitamin E, beta-carotene, and omega-3 fatty acids.
Vitamin C, Vitamin E, beta-carotene, zinc, and copper.
Lutein, zeaxanthin, omega-3 fatty acids, zinc, and copper.

Correct answer: Vitamin C, Vitamin E, lutein, zeaxanthin, zinc, and copper.

The AREDS2 study found that a formulation containing Vitamin C (500 mg), Vitamin E (400 IU), lutein (10 mg), zeaxanthin (2 mg), zinc (80 mg), and copper (2 mg) reduced the risk of progression to advanced AMD. The study recommended replacing beta-carotene with lutein and zeaxanthin because beta-carotene was linked to an increased risk of lung cancer in smokers and the new combination provided an additional reduction in risk. Omega-3 fatty acids were studied but did not show a significant additional benefit.

Question 91: Which condition is characterized by a triad of ophthalmoplegia, ataxia, and confusion and is caused by thiamine deficiency?

Miller Fisher syndrome
Myasthenia gravis
Tolosa-Hunt syndrome
Wernicke encephalopathy (Correct answer)

Correct answer: Wernicke encephalopathy

Wernicke encephalopathy presents with the classic triad of ophthalmoplegia, ataxia, and confusion due to thiamine (vitamin B1) deficiency, commonly seen in chronic alcoholism.

Question 92: A 62-year-old patient with poorly controlled diabetes and hypertension presents with the sudden onset of a droopy right eyelid and double vision. Examination reveals a complete ptosis and an eye that is deviated 'down and out.' The right pupil is 4mm and briskly reactive, identical to the left. Which of the following is the most likely etiology?

Cavernous sinus thrombosis
Giant cell arteritis
Microvascular ischemia (Correct answer)
Posterior communicating artery aneurysm

Correct answer: Microvascular ischemia

The patient presents with a classic pupil-sparing third nerve palsy. The oculomotor nerve (CN III) has pupillomotor fibers running on its periphery, which are susceptible to compression, while the main motor fibers are in the core. Microvascular ischemia, commonly due to diabetes or hypertension, affects the central, vasa nervorum-supplied part of the nerve, sparing the peripheral pupillary fibers. An aneurysm would typically compress the nerve from the outside, involving the pupil early. Cavernous sinus thrombosis would likely involve other cranial nerves (IV, V1, V2, VI). Giant cell arteritis is a less common cause and would usually present with other systemic symptoms.

Question 93: Which class of medication is commonly used as a first-line therapy in open-angle glaucoma?

Prostaglandin analogs (Correct answer)
Antibiotics
Antihistamines
Mydriatics

Correct answer: Prostaglandin analogs

A visual field test is an essential diagnostic tool for monitoring optic nerve damage in glaucoma. It assesses the patient's peripheral and central vision, detecting characteristic patterns of vision loss that indicate nerve damage. This test helps track the progression of the disease and guide treatment decisions.

Question 94: Which muscle is most commonly entrapped in a blowout fracture of the orbital floor?

Inferior oblique
Superior oblique
Medial rectus
Inferior rectus (Correct answer)

Correct answer: Inferior rectus

The inferior rectus muscle and its surrounding connective tissue are most commonly entrapped in orbital floor blowout fractures, causing restricted upgaze.

Question 95: Which type of retinal detachment is most commonly associated with intraocular tumors such as choroidal melanoma?

Exudative retinal detachment (Correct answer)
Combined tractional-rhegmatogenous detachment
Tractional retinal detachment
Rhegmatogenous retinal detachment

Correct answer: Exudative retinal detachment

Intraocular tumors cause exudative (serous) retinal detachment by disrupting the blood-retinal barrier and producing subretinal fluid without a retinal break.

Question 96: Which type of glaucoma is most commonly associated with elevated episcleral venous pressure?

Sturge-Weber syndrome-associated glaucoma (Correct answer)
Steroid-induced glaucoma
Normal-tension glaucoma
Pigmentary glaucoma

Correct answer: Sturge-Weber syndrome-associated glaucoma

Sturge-Weber syndrome causes elevated episcleral venous pressure from arteriovenous malformations, which impedes aqueous outflow and leads to secondary glaucoma.

Question 97: A 72-year-old patient on maximum tolerated medical therapy still shows progressive optic nerve cupping. Which surgical intervention has the highest long-term success rate for primary open-angle glaucoma?

Anterior chamber paracentesis
Cyclophotocoagulation
Argon laser trabeculoplasty
Trabeculectomy with mitomycin C (Correct answer)

Correct answer: Trabeculectomy with mitomycin C

Trabeculectomy with mitomycin C remains the gold standard surgical intervention for medically uncontrolled primary open-angle glaucoma with the best long-term IOP reduction.

Question 98: In a patient with neovascular glaucoma secondary to proliferative diabetic retinopathy, what is the most critical initial treatment step?

Topical prostaglandin analog monotherapy
Panretinal photocoagulation and/or intravitreal anti-VEGF injection (Correct answer)
Observation with serial IOP monitoring
Selective laser trabeculoplasty

Correct answer: Panretinal photocoagulation and/or intravitreal anti-VEGF injection

Treating the underlying retinal ischemia with panretinal photocoagulation and anti-VEGF therapy is essential to halt the neovascular drive before addressing IOP surgically.

Question 99: A +10.00 D spectacle lens worn at a 10 mm vertex distance is converted to a contact lens. What contact lens power is approximately needed?

+9.00 D
+11.00 D (Correct answer)
+10.00 D
+12.50 D

Correct answer: +11.00 D

Effective power is 10 / (1 - 0.01 x 10) ≈ +11.1 D, since plus lenses moved closer to the eye need more power.

Question 100: What is the typical treatment for wet age-related macular degeneration?

Anti-VEGF injections (Correct answer)
Laser photocoagulation
Steroid eye drops
Oral antibiotics

Correct answer: Anti-VEGF injections

Wet age-related macular degeneration (AMD) involves the growth of abnormal, leaky blood vessels under the macula, causing vision loss. Anti-VEGF (vascular endothelial growth factor) injections work by blocking a protein that promotes this abnormal vessel growth. This treatment helps to reduce fluid leakage, prevent further damage to the macula, and often stabilizes or improves vision.

Question 101: Weeks after penetrating trauma to the right eye, a patient develops inflammation in the uninjured left eye. What is the diagnosis?

Phacoanaphylactic uveitis
Posner-Schlossman syndrome
Bacterial endophthalmitis
Sympathetic ophthalmia (Correct answer)

Correct answer: Sympathetic ophthalmia

Sympathetic ophthalmia is a bilateral granulomatous panuveitis arising after penetrating trauma or surgery to one eye (the exciting eye), affecting the fellow sympathizing eye via autoimmune sensitization to uveal antigens.

Question 102: A patient presents with a new-onset vertical diplopia and a compensatory right head tilt. Examination reveals a left hypertropia that worsens in right gaze and with a right head tilt. Using the Parks-Bielschowsky three-step test, which muscle is paretic?

Right superior rectus
Left inferior rectus
Left superior oblique (Correct answer)
Right inferior oblique

Correct answer: Left superior oblique

Step 1: A left hypertropia implicates weakness in a left eye depressor (inferior rectus, superior oblique) or a right eye elevator (superior rectus, inferior oblique). Step 2: The hypertropia worsens in right gaze, which isolates muscles with primary vertical action in adduction (left superior oblique) or abduction (right superior rectus). Step 3: The hypertropia worsens with a head tilt to the right (ipsilateral to the hypertropic eye's paretic intorter). During a right head tilt, the right eye intorts (RSR, RSO) and the left eye extorts (LIO, LIR). A weak left superior oblique (an intorter) would cause the left superior rectus to be unopposed, worsening the hypertropia. All three steps point to a left superior oblique palsy.

Question 103: Which diagnostic finding on optical coherence tomography (OCT) is most characteristic of early glaucomatous damage?

Epiretinal membrane formation
Thickening of the central macular region
Thinning of the retinal nerve fiber layer in the inferior temporal sector (Correct answer)
Subretinal fluid accumulation

Correct answer: Thinning of the retinal nerve fiber layer in the inferior temporal sector

Early glaucomatous damage typically manifests as RNFL thinning, most commonly in the inferior temporal sector corresponding to the arcuate nerve fiber bundles.

Question 104: Which of the following is the most common primary malignant orbital tumor in adults?

Capillary hemangioma
Optic nerve glioma
Rhabdomyosarcoma
Lymphoma (Correct answer)

Correct answer: Lymphoma

Orbital lymphoma (most often B-cell non-Hodgkin) is the most common primary malignant orbital tumor in adults.

Question 105: A prism with an apical angle of 10 degrees and refractive index of 1.5 produces what amount of deviation?

10 prism diopters
7.5 prism diopters
5 prism diopters (Correct answer)
15 prism diopters

Correct answer: 5 prism diopters

Using the thin prism approximation, deviation = (n-1) x apical angle = (1.5-1) x 10 = 5 prism diopters.

Question 106: Which finding on examination is pathognomonic for Duane retraction syndrome Type I?

Inability to depress the eye in adduction
Limitation of elevation in adduction
Globe retraction with narrowing of the palpebral fissure on adduction (Correct answer)
Exotropia worse at near

Correct answer: Globe retraction with narrowing of the palpebral fissure on adduction

Globe retraction with palpebral fissure narrowing on attempted adduction is the hallmark of Duane syndrome, caused by co-contraction of the horizontal rectus muscles.

Question 107: A 70-year-old woman presents with new-onset diplopia, jaw claudication, and an ESR of 95 mm/hr. What is the most critical next step to prevent permanent vision loss?

Immediate high-dose systemic corticosteroids (Correct answer)
Temporal artery biopsy before any treatment
MRI of the orbits
Observation with serial visual fields

Correct answer: Immediate high-dose systemic corticosteroids

Giant cell arteritis requires immediate high-dose corticosteroids to prevent irreversible bilateral vision loss; biopsy can be performed after treatment initiation without affecting results for up to two weeks.

Question 108: Using the SRK regression formula, an axial length error of 1 mm results in approximately what IOL power error?

5.0 D
0.5 D
1.0 D
2.5 D (Correct answer)

Correct answer: 2.5 D

In the SRK formula (P = A - 2.5L - 0.9K), the axial length coefficient is 2.5 D per mm.

Question 109: What wavelength does the argon fluoride excimer laser used in refractive surgery emit?

248 nm
532 nm
193 nm (Correct answer)
1064 nm

Correct answer: 193 nm

The ArF excimer laser emits ultraviolet light at 193 nm, which ablates corneal tissue by photodecomposition.

Question 110: What is the critical angle for total internal reflection at a crown glass-air interface if the refractive index of crown glass is 1.52?

56.4 degrees
33.3 degrees
41.1 degrees (Correct answer)
48.8 degrees

Correct answer: 41.1 degrees

The critical angle is calculated as arcsin(1/1.52), which equals approximately 41.1 degrees.

Question 111: A 45-year-old woman presents with sudden painless vision loss and fundoscopy reveals a cherry-red spot at the macula with surrounding retinal whitening. Which condition is most likely?

Optic neuritis
Anterior ischemic optic neuropathy
Central retinal vein occlusion
Central retinal artery occlusion (Correct answer)

Correct answer: Central retinal artery occlusion

A cherry-red spot with surrounding pale, edematous retina is the hallmark fundoscopic finding of central retinal artery occlusion due to inner retinal ischemia.

Question 112: When interpreting a Humphrey Visual Field (HVF) 24-2 test for glaucoma, which of the following indices is most useful for identifying localized, focal defects characteristic of early glaucomatous damage?

Visual Field Index (VFI)
Mean Deviation (MD)
Fixation Losses
Pattern Standard Deviation (PSD) (Correct answer)

Correct answer: Pattern Standard Deviation (PSD)

The Pattern Standard Deviation (PSD) reflects the degree to which the shape of the patient's measured visual field departs from the normal, age-corrected hill of vision. A high PSD value indicates focal or localized loss, which is typical for early to moderate glaucoma, rather than a generalized depression of the entire field. The Mean Deviation (MD) represents the overall, average deviation from the norm and is more affected by diffuse loss, such as from a cataract. The Visual Field Index (VFI) is a staging index that expresses the amount of visual field loss as a percentage of a normal field. Fixation losses are a reliability index.

Question 113: A patient presents with recurrent hypopyon uveitis, painful oral ulcers, and genital ulcers. What is the most likely diagnosis?

Behçet disease (Correct answer)
Crohn's disease
Reactive arthritis (Reiter syndrome)
Ankylosing spondylitis

Correct answer: Behçet disease

Behçet disease classically presents with the triad of recurrent oral ulcers, genital ulcers, and uveitis (often with hypopyon), and is more severe in patients of Middle Eastern or Asian descent.

Question 114: Why can the anterior chamber angle not be seen directly at the slit lamp without a gonioscopy lens?

Absorption of light by the corneal stroma
Total internal reflection at the tear film-air interface (Correct answer)
Diffraction at the limbus
Chromatic aberration of the crystalline lens

Correct answer: Total internal reflection at the tear film-air interface

Light from the angle strikes the cornea-air interface beyond the critical angle and is totally internally reflected; a goniolens replaces the air interface to overcome this.

Question 115: Which optic nerve head finding on OCT is most useful for detecting early structural glaucomatous damage before visual field changes appear?

Peripapillary atrophy
Retinal nerve fiber layer thinning (Correct answer)
Disc hemorrhage
Increased cup-to-disc ratio

Correct answer: Retinal nerve fiber layer thinning

RNFL thinning on OCT can detect structural glaucomatous damage before functional visual field loss becomes measurable.

Question 116: A patient with sickle cell disease develops proliferative retinopathy. In which retinal location do sea-fan neovascular lesions most commonly arise?

Peripheral retina at the border of perfused and non-perfused zones (Correct answer)
Along the major vascular arcades
Peripapillary region
Posterior pole near the macula

Correct answer: Peripheral retina at the border of perfused and non-perfused zones

Sea-fan neovascularization in sickle cell retinopathy characteristically develops at the junction between perfused and non-perfused peripheral retina.

Question 117: Which finding on confocal microscopy is pathognomonic for Acanthamoeba keratitis?

Intracellular gram-negative diplococci
Branching dendritic lesions
Filamentary structures in the stroma
Hyper-reflective round double-walled cysts (Correct answer)

Correct answer: Hyper-reflective round double-walled cysts

Confocal microscopy reveals characteristic hyper-reflective, double-walled round cysts of Acanthamoeba in the corneal stroma, allowing rapid noninvasive diagnosis.

Question 118: According to the American Academy of Pediatrics and American Academy of Ophthalmology screening guidelines, which of the following infants requires screening examinations for retinopathy of prematurity (ROP)?

An infant born at 31 weeks gestation with a birth weight of 1600 grams.
An infant born at 32 weeks gestation with a birth weight of 1550 grams.
An infant born at 29 weeks gestation with a birth weight of 1200 grams. (Correct answer)
An infant born at 33 weeks gestation with a birth weight of 1800 grams.

Correct answer: An infant born at 29 weeks gestation with a birth weight of 1200 grams.

Current ROP screening guidelines recommend examinations for all infants with a birth weight of less than 1500 grams or a gestational age of 30 weeks or less. An infant born at 29 weeks with a birth weight of 1200 grams meets both of these criteria and definitively requires screening. The other infants listed fall outside these primary screening parameters.

Question 119: Which glaucoma medication is contraindicated in a patient with a history of severe reactive airway disease?

Dorzolamide
Latanoprost
Brimonidine
Timolol (Correct answer)

Correct answer: Timolol

Timolol is a nonselective beta-blocker that can cause bronchospasm and is contraindicated in severe asthma or COPD.

Question 120: A 72-year-old patient with moderate primary open-angle glaucoma is being monitored for progression. Which combination of tests provides the most comprehensive information to assess for glaucomatous progression?

Corneal pachymetry and fundus photography
Stereoscopic optic disc photography/OCT and automated perimetry (Correct answer)
Tonometry and gonioscopy
Serial tonometry and family history review

Correct answer: Stereoscopic optic disc photography/OCT and automated perimetry

Monitoring glaucoma progression requires assessing both structural (optic nerve and RNFL) and functional (visual field) changes over time. Stereoscopic optic disc photography or, more commonly now, Optical Coherence Tomography (OCT) provides objective, quantitative data on structural changes. Standard automated perimetry (visual field testing) assesses functional loss. Using both tests together provides complementary information, as structural changes can sometimes precede functional loss and vice versa, especially in different stages of the disease. The other options are important for initial diagnosis or risk assessment but are not the primary methods for monitoring progression.

Question 121: Which of the following systemic autoimmune diseases is most frequently associated with the development of necrotizing scleritis?

Sarcoidosis
Inflammatory Bowel Disease
Rheumatoid Arthritis (Correct answer)
Systemic Lupus Erythematosus

Correct answer: Rheumatoid Arthritis

Rheumatoid arthritis is the most common systemic autoimmune disease associated with scleritis, particularly the most severe form, necrotizing scleritis. While other conditions like granulomatosis with polyangiitis (GPA), systemic lupus erythematosus, and inflammatory bowel disease can also be associated with scleritis, rheumatoid arthritis is the most prevalent link found in large patient cohorts.

Question 122: What is the dioptric power of a thin lens with a focal length of 25 cm?

+2.50 D
+0.25 D
+40.00 D
+4.00 D (Correct answer)

Correct answer: +4.00 D

Power in diopters equals the reciprocal of the focal length in meters: 1/0.25 = 4.00 D.

Question 123: Which finding on optical coherence tomography (OCT) is most characteristic of central serous chorioretinopathy (CSC)?

Hyperreflective foci within the outer nuclear layer
Subretinal fluid with a neurosensory detachment and possible pigment epithelial detachment (Correct answer)
Disruption of the ellipsoid zone with subretinal fibrosis
Intraretinal cystic spaces with petaloid pattern

Correct answer: Subretinal fluid with a neurosensory detachment and possible pigment epithelial detachment

CSC classically demonstrates a dome-shaped neurosensory detachment with subretinal fluid accumulation, often accompanied by a pigment epithelial detachment on OCT.

Question 124: Which visual field test pattern is most specific for moderate glaucomatous progression beyond early disease?

Bitemporal hemianopia
Generalized constriction without focal defects
Arcuate scotoma connecting to the blind spot (Correct answer)
Central scotoma sparing the periphery

Correct answer: Arcuate scotoma connecting to the blind spot

An arcuate scotoma that connects to the physiologic blind spot follows the retinal nerve fiber layer pattern and is highly characteristic of moderate glaucomatous damage.

Question 125: A patient with rheumatoid arthritis develops progressive corneal thinning with an overlying epithelial defect in the peripheral cornea. What is the most likely diagnosis?

Peripheral ulcerative keratitis (Correct answer)
Terrien marginal degeneration
Mooren ulcer
Pellucid marginal degeneration

Correct answer: Peripheral ulcerative keratitis

Peripheral ulcerative keratitis (PUK) is strongly associated with systemic collagen vascular diseases, especially rheumatoid arthritis, and presents with peripheral stromal thinning and an overlying epithelial defect.

Question 126: Which minimally invasive glaucoma surgery (MIGS) device works by enhancing trabecular outflow through Schlemm's canal?

Ex-PRESS shunt
Ahmed glaucoma valve
iStent (Correct answer)
Xen Gel Stent

Correct answer: iStent

The iStent is a trabecular micro-bypass device that creates a direct pathway from the anterior chamber into Schlemm's canal.

Question 127: A patient looks through a point 4 mm away from the optical center of a -5.00 D spherical lens. How much prism is induced?

2 prism diopters (Correct answer)
0.8 prism diopters
1 prism diopter
20 prism diopters

Correct answer: 2 prism diopters

By Prentice's rule, prism equals decentration in cm times lens power: 0.4 x 5 = 2 prism diopters.

Question 128: Which of the following findings is most characteristic of Normal-Tension Glaucoma (NTG)?

Peripheral anterior synechiae on gonioscopy.
A deep, centrally located visual field defect.
Optic disc hemorrhages. (Correct answer)
Intraocular pressures consistently above 25 mmHg.

Correct answer: Optic disc hemorrhages.

Normal-Tension Glaucoma (NTG) is characterized by glaucomatous optic neuropathy in the setting of statistically normal intraocular pressures. While many features overlap with POAG, optic disc hemorrhages (Drance hemorrhages) are found more frequently in patients with NTG and are often a sign of disease progression. Visual field defects in NTG are often closer to fixation than in POAG. High IOP is contrary to the definition of NTG. Peripheral anterior synechiae are a sign of angle-closure glaucoma.

Question 129: Which class of glaucoma medications works by decreasing aqueous humor production through inhibition of carbonic anhydrase?

Latanoprost
Pilocarpine
Brimonidine
Dorzolamide (Correct answer)

Correct answer: Dorzolamide

Dorzolamide is a topical carbonic anhydrase inhibitor that reduces aqueous humor production.

Question 130: What is the most appropriate initial management for a moderate chemical alkali burn to the eye with limbal ischemia involving 4 clock hours?

Emergent penetrating keratoplasty
Copious irrigation followed by topical steroids and ascorbate (Correct answer)
Topical antibiotics and observation
Immediate surgical debridement

Correct answer: Copious irrigation followed by topical steroids and ascorbate

Immediate copious irrigation is the critical first step in chemical burns, followed by topical steroids to reduce inflammation and ascorbate to promote collagen synthesis and prevent corneal melting.

Question 131: A 4-month-old infant presents with nystagmus and profoundly poor vision. Parents report the infant frequently pokes and presses on their eyes with their fists. This behavior, known as the oculodigital sign, is a pathognomonic feature of which of the following conditions?

Leber congenital amaurosis (LCA) (Correct answer)
Infantile nystagmus syndrome
Congenital stationary night blindness
Achromatopsia

Correct answer: Leber congenital amaurosis (LCA)

The Franceschetti oculodigital sign, which involves eye poking, pressing, and rubbing, is a characteristic and pathognomonic finding in infants with Leber congenital amaurosis (LCA). This behavior is thought to create phosphenes (mechanical stimulation of the retina causing a sensation of light), which may be the only visual stimulation these severely visually impaired infants can experience. While nystagmus is present in the other conditions, the oculodigital sign is most strongly associated with LCA.

Question 132: Which class of glaucoma medication is contraindicated in patients with a history of cystoid macular edema following cataract surgery?

Alpha-2 agonists
Carbonic anhydrase inhibitors
Prostaglandin analogs (Correct answer)
Beta-blockers

Correct answer: Prostaglandin analogs

Prostaglandin analogs can exacerbate or trigger cystoid macular edema, particularly in pseudophakic eyes with disrupted posterior capsule.

Question 133: A 29-year-old obese female with a BMI of 38 presents with a six-month history of daily, pulsatile headaches, transient visual obscurations, and a 'whooshing' sound in her ears. Fundus examination reveals bilateral grade 2 papilledema. According to the modified Dandy criteria, which of the following is required to confirm a diagnosis of idiopathic intracranial hypertension (IIH)?

Focal neurological signs other than a sixth nerve palsy
Enlarged ventricles on MRI
Lumbar puncture opening pressure > 25 cm H2O (Correct answer)
Abnormal CSF composition

Correct answer: Lumbar puncture opening pressure > 25 cm H2O

The diagnosis of idiopathic intracranial hypertension (IIH) is guided by the modified Dandy criteria. These criteria require signs and symptoms of increased intracranial pressure, no other localizing neurologic signs (except for a possible 6th nerve palsy), normal neuroimaging (no mass, and typically normal to small ventricles), and normal CSF composition. A key diagnostic criterion is a lumbar puncture opening pressure greater than 25 cm H2O in an adult.

Question 134: A corneal transplant patient develops a Khodadoust line 14 months postoperatively. What does this finding indicate?

Epithelial rejection
Subepithelial rejection
Stromal rejection
Endothelial rejection (Correct answer)

Correct answer: Endothelial rejection

A Khodadoust line is a linear endothelial precipitate that represents endothelial graft rejection, the most sight-threatening form of corneal transplant rejection.

Question 135: A patient with multiple sclerosis develops bilateral sequential optic neuritis. MRI of the brain shows periventricular white matter lesions. What visual field defect is most characteristic of optic neuritis?

Altitudinal field defect
Bitemporal hemianopia
Central scotoma (Correct answer)
Homonymous hemianopia

Correct answer: Central scotoma

Central scotoma is the most common visual field defect in optic neuritis, resulting from inflammation of the central fibers of the optic nerve.

Question 136: A pediatrician refers a 2-month-old infant for evaluation of bilateral leukocoria. Examination under anesthesia confirms the presence of bilateral, dense, visually significant cataracts. Based on morphology, which type of congenital cataract is most commonly associated with the need for early surgical intervention?

Anterior polar
Sutural
Cerulean (blue-dot)
Lamellar (zonular) (Correct answer)

Correct answer: Lamellar (zonular)

While many morphologies exist, lamellar (or zonular) cataracts, which affect a specific layer of lens fibers surrounding the fetal nucleus, are a common form of visually significant congenital cataract that often requires early surgical removal to prevent amblyopia. Sutural and cerulean cataracts are often not visually significant, and small anterior polar cataracts may also be observed without intervention.

Question 137: Which condition is characterized by neovascularization in the retina?

Central serous retinopathy
Epiretinal membrane
Macular hole
Proliferative diabetic retinopathy (Correct answer)

Correct answer: Proliferative diabetic retinopathy

Optical Coherence Tomography (OCT) is a non-invasive imaging technique that provides high-resolution cross-sectional images of the retina, including the macula. It is the primary diagnostic tool for evaluating macular degeneration, enabling ophthalmologists to detect fluid, drusen, and other structural changes indicative of the condition. OCT helps monitor disease progression and treatment effectiveness.

Question 138: What is the mechanism of action of cyclosporine when used as a steroid-sparing agent in uveitis?

Inhibits TNF-alpha production by macrophages
Inhibits dihydrofolate reductase and lymphocyte proliferation
Blocks calcineurin, preventing IL-2 transcription and T-cell activation (Correct answer)
Depletes peripheral B lymphocytes via CD20 targeting

Correct answer: Blocks calcineurin, preventing IL-2 transcription and T-cell activation

Cyclosporine inhibits calcineurin, thereby blocking IL-2 gene transcription and T-cell activation, which is effective in immune-mediated uveitis requiring steroid-sparing therapy.

Question 139: A corneal transplant patient develops an epithelial rejection line (Khodadoust line) 8 months postoperatively. What is the appropriate initial management?

Observation without treatment
Immediate re-grafting
Topical antibiotics only
Intensive topical corticosteroids (prednisolone acetate 1% every hour) (Correct answer)

Correct answer: Intensive topical corticosteroids (prednisolone acetate 1% every hour)

Endothelial graft rejection presenting with a Khodadoust line requires aggressive topical corticosteroids initiated immediately to prevent irreversible endothelial cell loss.

Question 140: A 6-month-old has a constant large-angle esotropia with cross-fixation. What is the recommended initial management?

Observation until age 2
Prism adaptation followed by surgery
Bilateral medial rectus recession (Correct answer)
Full-time occlusion therapy

Correct answer: Bilateral medial rectus recession

Infantile esotropia with large constant angles is best treated with early bilateral medial rectus recession to achieve alignment before cortical maturation.

Question 141: A 74-year-old female presents with an acute, profound, and painless loss of vision in her right eye. She also reports several weeks of new-onset headaches, scalp tenderness, and pain in her jaw when chewing. Examination reveals a pale, swollen optic disc in the right eye. What is the most critical immediate step in management?

Order an urgent temporal artery biopsy
Schedule an MRI of the brain and orbits
Obtain a stat erythrocyte sedimentation rate (ESR) and C-reactive protein (CRP)
Administer high-dose systemic corticosteroids immediately (Correct answer)

Correct answer: Administer high-dose systemic corticosteroids immediately

The clinical presentation is highly suggestive of giant cell arteritis (GCA) causing an arteritic anterior ischemic optic neuropathy (A-AION). This is a neuro-ophthalmic emergency. The most critical step is to immediately start high-dose systemic corticosteroids to prevent catastrophic, irreversible vision loss in the fellow eye. While labs and a temporal artery biopsy are necessary for diagnosis, treatment should not be delayed while awaiting these results.

Question 142: A 68-year-old glaucoma suspect is being monitored with annual spectral-domain OCT of the retinal nerve fiber layer (RNFL). According to glaucoma progression analysis software and established research, which of the following changes in average RNFL thickness would be most suspicious for true glaucomatous progression, exceeding expected age-related thinning?

An increase of 3 µm over one year
A decrease of 2 µm over five years
A decrease of 5 µm over two years (Correct answer)
A decrease of 0.5 µm over one year

Correct answer: A decrease of 5 µm over two years

While age-related RNFL thinning occurs at a rate of approximately -0.5 µm/year, glaucomatous progression is marked by a faster rate of loss. An event-based change of 5 µm or more is considered suspicious for progression. A decrease of 5 µm over two years (-2.5 µm/year) is significantly faster than age-related loss and highly indicative of true glaucomatous progression, warranting consideration for treatment initiation.

Question 143: A 10-month-old infant presents with persistent tearing and mattering of the right eye since birth, consistent with congenital nasolacrimal duct obstruction (CNLDO). Conservative management with massage and topical antibiotics has failed to resolve the symptoms. According to current evidence, what is the most appropriate next step in management?

Perform nasolacrimal duct probing under general anesthesia. (Correct answer)
Continue conservative management and re-evaluate at 18 months.
Perform a dacryocystorhinostomy (DCR).
Place a Crawford tube without initial probing.

Correct answer: Perform nasolacrimal duct probing under general anesthesia.

Spontaneous resolution of CNLDO is high in the first year of life, but the rate plateaus after 9-10 months. Probing is a highly successful first-line surgical intervention, with success rates declining after 12-15 months. Therefore, for a 10-month-old who has failed conservative therapy, probing is the most appropriate next step. DCR is reserved for failed probings or complex cases, and placing a tube without probing is not the standard initial procedure.

Question 144: Which pupillary finding is characteristic of a dorsal midbrain (Parinaud) syndrome?

Horner syndrome
Marcus Gunn pupil
Argyll Robertson pupils
Light-near dissociation with large pupils (Correct answer)

Correct answer: Light-near dissociation with large pupils

Dorsal midbrain syndrome classically presents with light-near dissociation where pupils react poorly to light but constrict with convergence, along with large, irregular pupils.

Question 145: Which layer of the cornea is most affected in Fuchs endothelial corneal dystrophy?

Bowman layer
Epithelial basement membrane
Descemet membrane and endothelium (Correct answer)
Stroma

Correct answer: Descemet membrane and endothelium

Fuchs dystrophy is characterized by progressive loss of endothelial cells and thickening of Descemet membrane with guttae formation.

Question 146: A patient presents with a small, round, white opacity on the anterior lens capsule following a resolved episode of acute angle-closure glaucoma. What is this finding called?

Mittendorf dot
Vossius ring
Glaukomflecken (Correct answer)
Elschnig pearls

Correct answer: Glaukomflecken

Glaukomflecken are small anterior subcapsular lens opacities caused by focal ischemic necrosis of the lens epithelium during an acute angle-closure attack.

Question 147: A neonate presents with bilateral upper eyelid ptosis, inability to elevate either eye, and chin-up head posture. What is the most likely diagnosis?

Congenital fibrosis of the extraocular muscles (Correct answer)
Double elevator palsy with Marcus Gunn jaw-winking
Myasthenia gravis
Bilateral third nerve palsy

Correct answer: Congenital fibrosis of the extraocular muscles

Congenital fibrosis of the extraocular muscles (CFEOM) presents with restrictive ophthalmoplegia, ptosis, and characteristic infraducted eye positions from birth.

Question 148: What is the characteristic OCT finding in central serous chorioretinopathy?

Vitreomacular traction with foveal distortion
Epiretinal membrane with retinal surface wrinkling
Intraretinal cystic spaces in the outer nuclear layer
Neurosensory retinal detachment with subretinal fluid (Correct answer)

Correct answer: Neurosensory retinal detachment with subretinal fluid

Central serous chorioretinopathy classically shows a dome-shaped neurosensory retinal detachment with optically clear subretinal fluid on OCT.

Question 149: A presbyopic hyperope slides plus-power reading glasses farther down the nose. What happens to the effective lens power?

Effective power is unchanged
Effective plus power increases (Correct answer)
Effective plus power decreases
Lens becomes effectively minus

Correct answer: Effective plus power increases

Moving a plus lens away from the eye increases its effective plus power at the eye.

Question 150: During evaluation of a corneal laceration, a dark tissue is noted plugging the wound. The anterior chamber is shallow compared to the fellow eye. What is the most critical next step?

Protect the eye with a rigid shield and arrange emergent surgical repair (Correct answer)
Perform gonioscopy to evaluate the anterior chamber angle
Apply topical antibiotics and patch the eye for 24 hours
Attempt to reposit the tissue at the slit lamp

Correct answer: Protect the eye with a rigid shield and arrange emergent surgical repair

Prolapsed uveal tissue plugging a corneal laceration with a shallow anterior chamber indicates an open globe requiring emergent surgical repair with a protective shield placed immediately.

Question 151: A 45-year-old contact lens wearer presents with a ring-shaped corneal infiltrate and severe pain. Culture reveals Acanthamoeba. What is the most appropriate initial treatment?

Polyhexamethylene biguanide (PHMB) with propamidine (Correct answer)
Topical fluoroquinolone monotherapy
Topical natamycin alone
Oral acyclovir

Correct answer: Polyhexamethylene biguanide (PHMB) with propamidine

Acanthamoeba keratitis is treated with dual therapy using a biguanide (PHMB or chlorhexidine) combined with a diamidine (propamidine) to target both trophozoites and cysts.

Question 152: A 62-year-old phakic patient presents with an uncomplicated rhegmatogenous retinal detachment involving a single horseshoe tear at the 11 o'clock position with subretinal fluid extending just posterior to the equator but not involving the macula. Which of the following surgical options is generally considered the LEAST invasive procedure with a reasonable success rate for this specific presentation?

Laser retinopexy alone.
Pneumatic retinopexy. (Correct answer)
Pars plana vitrectomy with gas tamponade.
Scleral buckle.

Correct answer: Pneumatic retinopexy.

Pneumatic retinopexy is a minimally invasive procedure best suited for uncomplicated retinal detachments with retinal breaks located in the superior portion of the retina (typically between 8 and 4 o'clock). It involves injecting a gas bubble into the vitreous cavity to tamponade the retinal break, followed by cryotherapy or laser to create a permanent adhesion. While vitrectomy and scleral buckling are also effective, they are more invasive procedures. Laser alone is insufficient to reattach the retina.

Question 153: What is the hallmark visual field defect seen in a patient with a lesion at the optic chiasm caused by a pituitary adenoma?

Binasal hemianopia
Homonymous hemianopia
Bitemporal hemianopia (Correct answer)
Central scotoma

Correct answer: Bitemporal hemianopia

Bitemporal hemianopia results from compression of the crossing nasal retinal fibers at the optic chiasm, classically caused by pituitary adenomas growing superiorly.

Question 154: A 68-year-old male with a history of primary open-angle glaucoma (POAG) presents for a follow-up visit. His intraocular pressure (IOP) is 18 mmHg in both eyes on a prostaglandin analog. Optical Coherence Tomography (OCT) of the retinal nerve fiber layer (RNFL) shows progressive thinning in the inferotemporal quadrant of the right eye compared to the previous year. Visual field testing remains reliable and full. What is the most appropriate next step in management?

Discontinue the prostaglandin analog and switch to a beta-blocker.
Continue current therapy and repeat testing in one year.
Add a second IOP-lowering agent. (Correct answer)
Perform a laser peripheral iridotomy.

Correct answer: Add a second IOP-lowering agent.

The presence of documented structural progression (RNFL thinning on OCT) despite an IOP within the 'normal' range indicates that the current therapy is insufficient to halt the disease. Lowering the IOP further is the primary goal to slow progression. Adding a second medication is the standard approach in this scenario. Continuing the current therapy would be inappropriate given the evidence of progression. Switching to a beta-blocker alone may not provide sufficient additional IOP lowering. A laser peripheral iridotomy is indicated for angle-closure glaucoma, not POAG.

Question 155: In a patient with wet age-related macular degeneration, which OCT finding most strongly indicates active choroidal neovascularization requiring treatment?

Geographic atrophy of the RPE
Subretinal and intraretinal fluid with pigment epithelial detachment (Correct answer)
Drusen without subretinal fluid
Vitreomacular traction without fluid

Correct answer: Subretinal and intraretinal fluid with pigment epithelial detachment

The presence of subretinal fluid, intraretinal fluid, or pigment epithelial detachment on OCT indicates active exudation from choroidal neovascularization requiring anti-VEGF therapy.

Question 156: Which surgical procedure selectively replaces the posterior corneal layers while preserving the patient's anterior stroma?

Descemet membrane endothelial keratoplasty (DMEK) (Correct answer)
Penetrating keratoplasty (PKP)
Deep anterior lamellar keratoplasty (DALK)
Phototherapeutic keratectomy (PTK)

Correct answer: Descemet membrane endothelial keratoplasty (DMEK)

DMEK transplants only the donor Descemet membrane and endothelium, providing faster visual recovery and lower rejection rates than full-thickness grafts.

Question 157: Which finding on cycloplegic refraction most strongly suggests accommodative esotropia in a 3-year-old?

Astigmatism greater than 2.00 D
Hyperopia of +4.00 D or greater (Correct answer)
Emmetropia with normal AC/A ratio
Myopia of -3.00 D

Correct answer: Hyperopia of +4.00 D or greater

Significant hyperopia drives excessive accommodative convergence, which is the hallmark mechanism of accommodative esotropia.

Question 158: During penetrating keratoplasty, the surgeon notes a positive Seidel test at one of the suture sites on the first postoperative day. The anterior chamber is well-formed. What is the most appropriate initial management?

Immediate return to operating room for resuturing
Cyanoacrylate tissue adhesive application
Application of a bandage contact lens (Correct answer)
Observation without intervention

Correct answer: Application of a bandage contact lens

A small wound leak with a well-formed anterior chamber can be managed conservatively with a bandage contact lens, which tamponades the leak and promotes epithelial healing over the suture track.

Question 159: An uncorrected -2.00 D myope has a near point of 10 cm. What is the amplitude of accommodation?

8.00 D (Correct answer)
2.00 D
10.00 D
12.00 D

Correct answer: 8.00 D

Near point vergence is 10 D and far point vergence is 2 D, so accommodation amplitude is 10 - 2 = 8 D.

Question 160: Which condition involves inflammation of the eyelid margins?

Episcleritis
Uveitis
Blepharitis (Correct answer)
Keratitis

Correct answer: Blepharitis

The Schirmer test is a common diagnostic procedure used to evaluate the quantity of tear production. It involves placing a small strip of filter paper inside the lower eyelid for a few minutes to measure the amount of moisture absorbed. This test helps in diagnosing dry eye conditions and assessing tear film function.

Question 161: Which type of astigmatism is present when one focal line falls in front of the retina and the other falls behind it?

Compound hyperopic astigmatism
Mixed astigmatism (Correct answer)
Simple hyperopic astigmatism
Simple myopic astigmatism

Correct answer: Mixed astigmatism

Mixed astigmatism occurs when the two principal meridians focus on opposite sides of the retina.

Question 162: Which IOL material has the lowest rate of posterior capsule opacification (PCO)?

Hydrophilic acrylic
Silicone
PMMA
Hydrophobic acrylic (Correct answer)

Correct answer: Hydrophobic acrylic

Hydrophobic acrylic IOLs have a sharp square edge design and material properties that create a strong barrier effect against lens epithelial cell migration, resulting in the lowest PCO rates.

Question 163: A patient with intermediate uveitis shows 'snowballs' in the vitreous and 'snowbanking' over the pars plana. Which condition is most likely?

Sympathetic ophthalmia
Pars planitis (Correct answer)
Vogt-Koyanagi-Harada syndrome
Behçet disease

Correct answer: Pars planitis

Pars planitis is a form of idiopathic intermediate uveitis characterized by vitreous snowballs and snowbank (exudate) formation overlying the pars plana.

Question 164: Which type of esotropia is characterized by a high accommodative convergence to accommodation (AC/A) ratio?

Sensory esotropia
Infantile esotropia
Partially accommodative esotropia with high AC/A ratio (Correct answer)
Duane syndrome

Correct answer: Partially accommodative esotropia with high AC/A ratio

A high AC/A ratio esotropia shows significantly more deviation at near than at distance, often requiring bifocal correction.

Question 165: Which layer of the cornea is most responsible for maintaining corneal transparency through its deturgescence function?

Stroma
Bowman's layer
Endothelium (Correct answer)
Epithelium

Correct answer: Endothelium

The corneal endothelium maintains stromal deturgescence through active Na+/K+-ATPase pump function, which is critical for corneal transparency.

Question 166: Which test is commonly used to evaluate tear production?

Amsler grid test
Tonometry
Schirmer test (Correct answer)
Fluorescein angiography

Correct answer: Schirmer test

Glaucoma is a group of eye conditions that damage the optic nerve, often linked to elevated intraocular pressure (IOP). The primary objective of glaucoma treatment is to lower and maintain a healthy IOP. This crucial step helps to prevent further damage to the optic nerve and preserve the patient's remaining vision.

Question 167: What is the definition of one prism diopter?

Displacement of 1 mm at a distance of 1 m
Displacement of 1 cm at a distance of 10 cm
Deviation of 1 degree of arc
Displacement of 1 cm at a distance of 1 m (Correct answer)

Correct answer: Displacement of 1 cm at a distance of 1 m

One prism diopter deviates light 1 cm at 1 m, which is roughly 0.57 degrees for small angles.

Question 168: Which spectacle lens material has the highest Abbe value and therefore the least chromatic aberration?

Trivex
CR-39 plastic (Correct answer)
Polycarbonate
1.74 high-index plastic

Correct answer: CR-39 plastic

CR-39 has an Abbe value of about 58, much higher than polycarbonate (about 30) or 1.74 high-index (about 33).

Question 169: A Galilean telescope uses a +5.00 D objective and a -20.00 D eyepiece. What is its magnification?

4x, upright image (Correct answer)
0.25x, upright image
4x, inverted image
25x, upright image

Correct answer: 4x, upright image

Telescope magnification is -Feyepiece/Fobjective = 20/5 = 4x, and the minus eyepiece of a Galilean design gives an upright image.

Question 170: A 5-year-old child undergoes vision screening and is found to have visual acuity of 20/80 in the right eye and 20/20 in the left eye. The child has no manifest strabismus. Cycloplegic refraction is +6.00 D sphere in the right eye and +1.50 D sphere in the left eye. What is the most likely cause of the decreased vision in the right eye?

Meridional amblyopia
Deprivation amblyopia
Anisometropic amblyopia (Correct answer)
Strabismic amblyopia

Correct answer: Anisometropic amblyopia

Anisometropic amblyopia occurs when there is a significant difference in refractive error between the two eyes (anisometropia). The brain favors the eye with the clearer image (the left eye in this case) and suppresses the input from the eye with the blurred image (the highly hyperopic right eye), leading to amblyopia. The +4.50 D difference between the eyes is a classic setup for this condition.

Question 171: A patient undergoes trabeculectomy and develops a shallow anterior chamber with low IOP on postoperative day one. What is the most likely cause?

Malignant glaucoma
Endophthalmitis
Overfiltration through the bleb (Correct answer)
Suprachoroidal hemorrhage

Correct answer: Overfiltration through the bleb

Early postoperative hypotony with a shallow chamber after trabeculectomy most commonly results from overfiltration through the surgical site.

Question 172: A 30-year-old male presents with recurrent episodes of unilateral stromal keratitis with decreased corneal sensation. Examination reveals ghost vessels and stromal scarring. Which pathogen is most likely responsible?

Varicella-zoster virus
Epstein-Barr virus
Acanthamoeba species
Herpes simplex virus type 1 (Correct answer)

Correct answer: Herpes simplex virus type 1

HSV-1 stromal keratitis classically presents with recurrent unilateral inflammation, corneal hypoesthesia, ghost vessels, and progressive stromal scarring.

Question 173: Which prism orientation is used in spectacles to relieve symptomatic exophoria at near?

Base-down
Base-in (Correct answer)
Base-up
Base-out

Correct answer: Base-in

Base-in prism shifts the image outward, reducing the convergence demand for an exodeviation.

Question 174: Which bifocal segment design minimizes image jump?

Ultex A segment
Flat-top segment (Correct answer)
Blended invisible segment
Round-top segment

Correct answer: Flat-top segment

The flat-top segment's optical center lies near its top edge, so little prism is introduced as the eye enters the segment.

Question 175: Which aberration causes a point source of light to appear as a comet-shaped blur when imaged through a spherical lens peripherally?

Chromatic aberration
Spherical aberration
Coma (Correct answer)
Distortion

Correct answer: Coma

Coma produces an asymmetric, comet-shaped image of off-axis point sources due to varying magnification across the lens aperture.

Question 176: An A-pattern esotropia is characterized by a horizontal deviation that is:

Associated with overaction of the inferior oblique muscles.
Greater in upgaze than in downgaze. (Correct answer)
Equal in upgaze and downgaze but greater than in primary position.
Greater in downgaze than in upgaze.

Correct answer: Greater in upgaze than in downgaze.

Alphabetical patterns describe a change in the horizontal deviation in vertical gaze. In an A-pattern, the eyes converge more in upgaze and diverge more in downgaze, resembling the shape of the letter 'A'. Therefore, an A-pattern esotropia will have a larger esotropia measurement in upgaze compared to downgaze.

Question 177: What is the hallmark finding on CT that distinguishes thyroid eye disease (Graves' orbitopathy) from orbital lymphoma?

Enhancement of the lacrimal gland
Irregular soft tissue mass with bone destruction
Diffuse orbital fat stranding
Fusiform enlargement of extraocular muscles sparing the tendons (Correct answer)

Correct answer: Fusiform enlargement of extraocular muscles sparing the tendons

Thyroid eye disease characteristically causes fusiform enlargement of extraocular muscle bellies while sparing the tendons, unlike most other orbital masses.

Question 178: A patient with acute retinal necrosis syndrome should be treated initially with which antiviral agent?

Oral valacyclovir alone
Intravenous acyclovir (Correct answer)
Intravitreal foscarnet alone
Topical ganciclovir

Correct answer: Intravenous acyclovir

Acute retinal necrosis requires aggressive treatment with intravenous acyclovir to control the viral infection and prevent fellow eye involvement.

Question 179: A 55-year-old patient presents with progressive painless vision loss and examination reveals a sunflower cataract. Which systemic condition is most commonly associated with this finding?

Atopic dermatitis
Diabetes mellitus
Wilson disease (Correct answer)
Myotonic dystrophy

Correct answer: Wilson disease

A sunflower cataract with multicolored anterior subcapsular deposits is pathognomonic for Wilson disease due to copper deposition in the lens.

Question 180: Light passes from air into the cornea at an oblique angle. What happens to the ray?

It bends away from the normal
It bends toward the normal (Correct answer)
It is totally internally reflected
It goes straight through without bending

Correct answer: It bends toward the normal

By Snell's law, light entering a medium with a higher refractive index slows down and bends toward the normal.

Question 181: What is the preferred initial treatment for a 3-year-old with unilateral amblyopia and visual acuity of 20/80 in the amblyopic eye?

Full-time occlusion of the sound eye
Atropine penalization daily in both eyes
2 hours per day of patching the sound eye (Correct answer)
Immediate strabismus surgery

Correct answer: 2 hours per day of patching the sound eye

For moderate amblyopia (20/40 to 20/100), the PEDIG studies demonstrated that 2 hours of daily patching is as effective as 6 hours.

Question 182: According to Knapp's rule, where should a spectacle lens sit so that an eye with axial ametropia has a retinal image the same size as an emmetropic eye's?

At the corneal plane
At the eye's center of rotation
At the anterior focal point of the eye (Correct answer)
At the nodal point of the eye

Correct answer: At the anterior focal point of the eye

A correcting lens at the anterior focal point (about 15-17 mm in front of the cornea) gives an image the same size as in an emmetropic eye when the ametropia is axial.

Question 183: What is the function of the macula?

Peripheral vision
Central vision and color perception (Correct answer)
Night vision
Light regulation

Correct answer: Central vision and color perception

The macula is a small, highly sensitive area in the center of the retina, densely packed with cone photoreceptors. These specialized cells are responsible for our sharpest, most detailed vision, enabling us to see fine details and perceive colors. Therefore, the macula is crucial for central vision and tasks like reading and recognizing faces.

Question 184: Which visual field defect is classically associated with a branch retinal artery occlusion affecting the superior temporal arcade?

Inferior nasal scotoma (Correct answer)
Central scotoma
Superior altitudinal defect
Homonymous hemianopia

Correct answer: Inferior nasal scotoma

A branch retinal artery occlusion of the superior temporal arcade causes ischemia to the corresponding retinal area, resulting in an inferior nasal visual field defect.

Question 185: A biconvex lens made of crown glass (n=1.52) has a power of +5.00 D in air (n=1.00). If this same lens is fully submerged in water (n=1.33), what is its new approximate power?

+1.83 D (Correct answer)
+7.80 D
It becomes a minus-powered lens.
+5.00 D

Correct answer: +1.83 D

The power of a lens depends on the difference between the refractive index of the lens material and the surrounding medium. The simplified Lensmaker's equation is Power ∝ (n_lens - n_medium). In air, the power is proportional to (1.52 - 1.00) = 0.52. In water, the power is proportional to (1.52 - 1.33) = 0.19. The new power can be found by the ratio: P_water / P_air = (0.19 / 0.52). So, P_water = +5.00 D * (0.19 / 0.52) ≈ +1.83 D. Submerging the lens in a medium with a higher refractive index reduces the refractive power of the lens. [2, 17, 25]

Question 186: Which surgical procedure is preferred for correction of ptosis with poor levator function (less than 4 mm)?

Fasanella-Servat procedure
Frontalis suspension (Correct answer)
Levator aponeurosis advancement
Müller muscle-conjunctival resection

Correct answer: Frontalis suspension

Frontalis suspension is used for severe ptosis with poor levator function (<4 mm) because it harnesses the frontalis muscle to elevate the lid.

Question 187: A 55-year-old male presents with a one-week history of painless, progressive central vision loss in his right eye. Fundus examination reveals a localized serous detachment of the neurosensory retina in the macula. Optical coherence tomography (OCT) confirms subretinal fluid. Fluorescein angiography shows a focal point of leakage. What is the most appropriate initial management for this patient with acute central serous chorioretinopathy (CSC)?

Half-dose photodynamic therapy (PDT).
Observation for 3-4 months with lifestyle modification advice. (Correct answer)
Focal laser photocoagulation to the leakage point.
Immediate intravitreal anti-VEGF injection.

Correct answer: Observation for 3-4 months with lifestyle modification advice.

For most cases of acute central serous chorioretinopathy, the standard initial management is observation, as many cases resolve spontaneously within 3 to 4 months. Patients are often counseled on modifying risk factors such as stress. Active interventions like laser photocoagulation or PDT are typically reserved for chronic or persistent cases, or in specific situations where a patient has occupational needs for rapid vision recovery.

Question 188: What is the critical period for treating amblyopia to achieve the best visual outcome?

Before age 3 years only
Before age 7-8 years (Correct answer)
Any age up to 18 years
Before age 12-14 years

Correct answer: Before age 7-8 years

The visual system retains significant plasticity until approximately age 7-8, making this the critical window for effective amblyopia treatment.

Question 189: Which fundus finding is most characteristic of active toxoplasmic retinochoroiditis?

Epiretinal membrane over the macula
Dalen-Fuchs nodules at the level of the RPE
White fluffy lesion adjacent to an old pigmented scar ('headlight in fog') (Correct answer)
Perivascular candle-wax dripping exudates

Correct answer: White fluffy lesion adjacent to an old pigmented scar ('headlight in fog')

Active toxoplasmic retinochoroiditis characteristically shows a white, fluffy active lesion adjacent to an old pigmented chorioretinal scar, producing the classic 'headlight in fog' appearance.

Question 190: What is the mechanism of action of netarsudil, a newer glaucoma medication?

Selective alpha-2 agonism reducing aqueous production
Rho kinase inhibition leading to decreased trabecular meshwork resistance and reduced episcleral venous pressure (Correct answer)
Cholinergic stimulation causing ciliary muscle contraction
Carbonic anhydrase inhibition in the ciliary body

Correct answer: Rho kinase inhibition leading to decreased trabecular meshwork resistance and reduced episcleral venous pressure

Netarsudil is a rho kinase inhibitor that lowers IOP by decreasing trabecular meshwork outflow resistance and reducing episcleral venous pressure.

Question 191: A patient who underwent uneventful cataract surgery 3 weeks ago presents with decreased vision and a hypopyon. What is the most likely diagnosis?

Iris prolapse
Acute postoperative endophthalmitis (Correct answer)
Toxic anterior segment syndrome
Retained lens fragment

Correct answer: Acute postoperative endophthalmitis

Acute postoperative endophthalmitis typically presents within 1-6 weeks after surgery with pain, decreased vision, and hypopyon.

Question 192: Which test is most useful for detecting suppression in a child with strabismus?

Hirschberg test
Bruckner test
Cover-uncover test
Worth 4-dot test (Correct answer)

Correct answer: Worth 4-dot test

The Worth 4-dot test evaluates fusional status and readily identifies suppression by the absence of dots seen by one eye.

Question 193: A 58-year-old man presents with sudden, painless, severe vision loss in his left eye upon waking. His vision is counting fingers. Examination shows a relative afferent pupillary defect and a swollen, hyperemic optic disc. The contralateral eye has a small cup-to-disc ratio ('disc at risk'). Which of the following is the most likely diagnosis?

Central retinal artery occlusion (CRAO)
Non-arteritic anterior ischemic optic neuropathy (NAION) (Correct answer)
Arteritic anterior ischemic optic neuropathy (A-AION)
Optic neuritis

Correct answer: Non-arteritic anterior ischemic optic neuropathy (NAION)

This is a classic presentation for Non-Arteritic Anterior Ischemic Optic Neuropathy (NAION), which typically causes sudden, painless, monocular vision loss, often noticed upon awakening. Key signs include optic disc edema and a contralateral 'disc at risk' (a small, crowded optic disc with little or no cupping). A-AION is less common, usually affects older patients, and is associated with systemic symptoms of giant cell arteritis. Optic neuritis typically presents with pain on eye movement and affects a younger demographic. A CRAO presents with a 'cherry-red spot' on fundus exam and optic disc swelling is not an initial feature.

Question 194: According to the Diabetic Retinopathy Clinical Research Network (DRCR.net) Protocol S, for patients with proliferative diabetic retinopathy (PDR), how did visual acuity outcomes at 2 years for treatment with intravitreal ranibizumab compare to panretinal photocoagulation (PRP)?

The study was inconclusive regarding visual acuity.
PRP was superior to ranibizumab.
Ranibizumab was superior to PRP.
Ranibizumab was non-inferior to PRP. (Correct answer)

Correct answer: Ranibizumab was non-inferior to PRP.

The DRCR.net Protocol S demonstrated that intravitreal ranibizumab was non-inferior to panretinal photocoagulation (PRP) for treating proliferative diabetic retinopathy with respect to visual acuity outcomes at 2 years. While the mean visual acuity was slightly better in the ranibizumab group, the primary outcome was non-inferiority. The ranibizumab group also experienced less peripheral visual field loss and had a lower rate of developing diabetic macular edema.

Question 195: A 55-year-old presents with acute angle-closure glaucoma. After initial medical management lowers the IOP, what definitive treatment should be performed?

Laser peripheral iridotomy (Correct answer)
Selective laser trabeculoplasty
Trabeculectomy
Goniotomy

Correct answer: Laser peripheral iridotomy

Laser peripheral iridotomy is the definitive treatment for acute angle-closure glaucoma to prevent recurrence.

Question 196: Which of the following is the primary mechanism of action for intravitreal anti-VEGF agents in the treatment of macular edema secondary to a central retinal vein occlusion (CRVO)?

Inducing posterior vitreous detachment.
Decreasing vascular permeability and leakage. (Correct answer)
Dissolving the thrombus at the optic nerve head.
Reducing intraocular pressure.

Correct answer: Decreasing vascular permeability and leakage.

In retinal vein occlusion, ischemia leads to the upregulation of Vascular Endothelial Growth Factor (VEGF), which increases vascular permeability, causing macular edema. Anti-VEGF agents work by binding to and inhibiting VEGF, thereby reducing the leakage from retinal capillaries and decreasing the macular edema, which is the primary cause of vision loss.

Question 197: A prism with an apical angle of 10 degrees and refractive index of 1.5 produces approximately how many prism diopters of deviation?

7.5 prism diopters
15 prism diopters
5 prism diopters (Correct answer)
10 prism diopters

Correct answer: 5 prism diopters

Using the thin prism approximation, deviation = (n-1) × apical angle = (1.5-1) × 10 = 5 prism diopters.

Question 198: A 2-year-old has an abduction deficit of the left eye with narrowing of the palpebral fissure on attempted adduction. What is the diagnosis?

Left sixth nerve palsy
Left medial rectus restriction
Left Duane retraction syndrome type I (Correct answer)
Left Mobius syndrome

Correct answer: Left Duane retraction syndrome type I

Duane retraction syndrome type I features limited abduction with globe retraction and palpebral fissure narrowing on adduction due to co-innervation of the lateral rectus.

Question 199: At a 67 cm working distance, a retinoscopist neutralizes the reflex with +3.00 D. What is the patient's net refractive error?

+2.00 D
+3.00 D
+1.50 D (Correct answer)
+4.50 D

Correct answer: +1.50 D

A 67 cm working distance adds about 1.50 D, which is subtracted from the gross finding: +3.00 - 1.50 = +1.50 D.

Question 200: A 62-year-old diabetic patient presents with neovascularization of the disc (NVD) covering more than one-third of the disc area. According to the Early Treatment Diabetic Retinopathy Study (ETDRS), what is the most appropriate next step?

Observation with follow-up in 3 months
Pars plana vitrectomy
Prompt panretinal photocoagulation (Correct answer)
Intravitreal anti-VEGF monotherapy

Correct answer: Prompt panretinal photocoagulation

The ETDRS established that high-risk proliferative diabetic retinopathy with NVD exceeding one-third disc area warrants prompt panretinal photocoagulation to reduce the risk of severe vision loss.

Board Certified Ophthalmologist Exam

The Board Certified Ophthalmologist Exam exam validates essential knowledge and skills required for certification or licensure in this field.

200

Questions

240 min

Time Limit

70%

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Sources & references

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