American Board of Ophthalmology Written Qualifying Examination (WQE) — Questions and Answers

Question 1: What is the most common cause of a relative afferent pupillary defect (RAPD)?

Optic neuritis (Correct answer)
Glaucoma
Conjunctivitis
Cataract

Correct answer: Optic neuritis

A relative afferent pupillary defect (RAPD), also known as a Marcus Gunn pupil, indicates a lesion in the afferent visual pathway anterior to the optic chiasm. Optic neuritis, an inflammation of the optic nerve, is a common cause, as it impairs the nerve's ability to transmit light signals effectively from the affected eye to the brain, leading to a diminished pupillary constriction response.

Question 2: A 65-year-old patient with a history of hypertension is diagnosed with a central retinal vein occlusion (CRVO). What is the most common cause of vision loss in this condition?

Vitreous hemorrhage
Macular edema (Correct answer)
Tractional retinal detachment
Neovascular glaucoma

Correct answer: Macular edema

Macular edema is the most frequent cause of vision loss in both central and branch retinal vein occlusions. The venous obstruction leads to increased back pressure in the capillaries, causing fluid to leak into the macula.

Question 3: During gonioscopy, what is the most posterior structure visible in a normal, open angle?

Ciliary body band (Correct answer)
Scleral spur
Trabecular meshwork
Schwalbe's line

Correct answer: Ciliary body band

The structures of the angle from posterior to anterior are: Ciliary body band, Scleral spur, Trabecular meshwork, and Schwalbe's line. Therefore, the ciliary body band is the most posterior structure.

Question 4: A 70-year-old patient with pseudoexfoliation glaucoma has an intraocular pressure of 28 mmHg in the right eye despite maximal tolerated medical therapy with a prostaglandin analog, a beta-blocker, and a carbonic anhydrase inhibitor. Which of the following is the most appropriate next step in management?

Perform selective laser trabeculoplasty (SLT). (Correct answer)
Switch the prostaglandin analog to a different brand.
Continue to monitor the patient on the current regimen.
Add a fourth medication, such as a miotic.

Correct answer: Perform selective laser trabeculoplasty (SLT).

This patient has inadequately controlled IOP on maximal medical therapy. Selective laser trabeculoplasty (SLT) is a well-established and effective option to further lower IOP when medications are insufficient or not tolerated. Adding a fourth medication often has limited additional effect and increases the complexity and potential for side effects. Switching between prostaglandin analogs may offer a small benefit but is less likely to achieve the required pressure reduction than SLT. Continuing to monitor without intervention is inappropriate given the high IOP and risk of progression.

Question 5: A 25-year-old patient with progressive myopic astigmatism is examined. On downgaze, the lower eyelid is pushed forward into a 'V' shape by the conical cornea. What is this clinical sign called?

Fleischer's ring
Rizzuti's sign
Munson's sign (Correct answer)
Vogt's striae

Correct answer: Munson's sign

Munson's sign is the V-shaped indentation of the lower eyelid on downgaze, caused by an advanced conical cornea in keratoconus. It is a classic clinical sign indicating significant corneal ectasia.

Question 6: A 65-year-old man presents to the emergency department with a 2-hour history of sudden, profound, and painless vision loss in his left eye. His visual acuity is hand motion. Fundus examination reveals diffuse retinal whitening, arteriolar attenuation, and a prominent 'cherry-red spot' in the macula. What is the most critical immediate step in this patient's management?

Scheduling for urgent vitrectomy.
Anterior chamber paracentesis.
Immediate referral for a comprehensive stroke workup. (Correct answer)
Initiation of high-dose oral corticosteroids.

Correct answer: Immediate referral for a comprehensive stroke workup.

The patient's presentation is classic for a central retinal artery occlusion (CRAO), which is considered an ocular emergency analogous to an acute ischemic stroke. Immediate referral to a stroke center for evaluation is critical to identify the embolic source and reduce the high risk of a subsequent, potentially fatal, cerebral or myocardial infarction. While treatments like paracentesis or ocular massage exist to dislodge the embolus, their efficacy is debated and secondary to the systemic evaluation. Steroids are for arteritic causes (like GCA), which must be evaluated but the stroke workup is the priority for all patients. Vitrectomy has no role in acute CRAO management.

Question 7: Which B-scan ultrasonography finding is most characteristic of choroidal melanoma?

Low-to-medium internal reflectivity with acoustic hollowing and choroidal excavation (Correct answer)
Cystic spaces with septations
Dense calcification
High internal reflectivity

Correct answer: Low-to-medium internal reflectivity with acoustic hollowing and choroidal excavation

Choroidal melanoma characteristically shows low-to-medium internal reflectivity with acoustic hollowing (angle kappa) and choroidal excavation on standardized A/B-scan ultrasonography.

Question 8: Which of the following cycloplegic/mydriatic agents has the longest duration of action, often lasting for one to two weeks?

Tropicamide
Cyclopentolate
Phenylephrine
Atropine (Correct answer)

Correct answer: Atropine

Atropine is the most potent and longest-acting cycloplegic agent available. Its effects on accommodation and pupillary dilation can last for 7 to 14 days, making it useful for treating severe uveitis and for amblyopia therapy but less ideal for routine dilated fundus exams.

Question 9: A 72-year-old patient with symptomatic vitreomacular traction is treated with an intravitreal injection of ocriplasmin. What is the primary mechanism of action of this drug?

Inhibition of vascular endothelial growth factor (VEGF).
Enzymatic cleavage of proteins at the vitreoretinal interface. (Correct answer)
Reduction of intraocular inflammation via corticosteroid action.
Osmotic dehydration of the vitreous gel.

Correct answer: Enzymatic cleavage of proteins at the vitreoretinal interface.

Ocriplasmin is a recombinant form of the human enzyme plasmin. Its mechanism of action is to enzymatically cleave structural proteins, such as fibronectin and laminin, which are key components of the vitreoretinal interface. This proteolysis dissolves the adhesion between the vitreous and the macula, releasing the traction. Anti-VEGF agents (A) are used for neovascular diseases, corticosteroids (B) reduce inflammation, and osmotic agents (D) are not used in this context.

Question 10: What is the primary mechanism by which phacoemulsification removes the crystalline lens?

Laser photodisruption
Mechanical cutting with a blade
Chemical dissolution
High-frequency ultrasonic vibration (Correct answer)

Correct answer: High-frequency ultrasonic vibration

Phacoemulsification utilizes a hollow titanium needle that vibrates at ultrasonic frequencies (typically 20,000 to 60,000 Hz). This high-frequency vibration creates mechanical energy that emulsifies, or breaks up, the lens material, which is then aspirated through the hollow tip.

Question 11: When calculating intraocular lens (IOL) power for a patient with a very short axial length (<22.0 mm), which of the following formulas is generally considered more accurate?

SRK/T
Holladay 1
Hoffer Q (Correct answer)
SRK II

Correct answer: Hoffer Q

The Hoffer Q formula is a third-generation formula that is specifically optimized for eyes with short axial lengths. It tends to provide more predictable and accurate refractive outcomes in hyperopic eyes, reducing the risk of a postoperative hyperopic surprise that can occur with other formulas in this group.

Question 12: A 5-year-old is diagnosed with intermittent exotropia. The parents report the child's left eye drifts outward primarily when tired or looking in the distance. Which of the following findings is a primary indication for considering surgical intervention?

The near stereoacuity is 200 seconds of arc.
The child frequently closes one eye in bright sunlight.
The deviation measures 15 prism diopters at distance.
The deviation is manifest for more than 50% of waking hours. (Correct answer)

Correct answer: The deviation is manifest for more than 50% of waking hours.

The decision to operate on intermittent exotropia is multifactorial, but a primary indication is deteriorating fusional control. A deviation that is manifest (tropic) for more than 50% of waking hours is a widely accepted guideline indicating poor control and is a strong indication for surgery to preserve or restore binocular function. Closing one eye in the sun is a common symptom but not a sole indication for surgery. The size of the deviation and stereoacuity are important factors, but the frequency of the manifest deviation is a more direct measure of control.

Question 13: Which funduscopic feature best distinguishes choroidal melanoma from choroidal metastasis?

Posterior pole location
Orange lipofuscin pigment overlying the tumor (Correct answer)
Bilateral presentation
Subretinal fluid

Correct answer: Orange lipofuscin pigment overlying the tumor

Orange lipofuscin pigment (lipofuscin deposits on the tumor surface seen by fluorescein angiography) is a classic feature of choroidal melanoma and is rarely seen overlying choroidal metastases.

Question 14: Which test is most appropriate to confirm papilledema?

Fluorescein angiography
Fundus photography
Lumbar puncture (Correct answer)
Tonometry

Correct answer: Lumbar puncture

Papilledema is swelling of the optic disc due to increased intracranial pressure (ICP). While fundus photography can document the appearance, a lumbar puncture is the definitive test to measure cerebrospinal fluid (CSF) pressure and confirm elevated ICP, which is the underlying cause of papilledema. This helps differentiate true papilledema from pseudopapilledema or other optic disc anomalies.

Question 15: Which of the following optical principles correctly describes the correction for hyperopia?

A converging (convex) lens is used to move the focal point forward onto the retina. (Correct answer)
A prism is used to realign the image onto the fovea.
A cylindrical lens is used to correct the two different focal points.
A diverging (concave) lens is used to move the focal point backward onto the retina.

Correct answer: A converging (convex) lens is used to move the focal point forward onto the retina.

In hyperopia (farsightedness), light entering the eye focuses at a point behind the retina. To correct this, a converging lens (convex or 'plus' lens) is used. This lens adds focusing power, bending the light rays more strongly to move the focal point forward so that it lands directly on the retina.

Question 16: According to the Pediatric Eye Disease Investigator Group (PEDIG) Amblyopia Treatment Studies, which of the following is true regarding the treatment of moderate amblyopia (20/40 to 20/80) in children aged 3 to <7 years?

Patching for 2 hours daily was found to be as effective as patching for 6 hours daily. (Correct answer)
Patching for 6 hours daily is significantly more effective than patching for 2 hours daily.
Daily atropine 1% was found to be superior to patching.
Optical correction alone is ineffective and patching must be started immediately.

Correct answer: Patching for 2 hours daily was found to be as effective as patching for 6 hours daily.

A landmark PEDIG study (ATS1) demonstrated that for children aged 3 to <7 years with moderate amblyopia (visual acuity 20/40 to 20/80), patching the sound eye for 2 hours per day was as effective as patching for 6 hours per day. This finding changed clinical practice, allowing for reduced treatment burden with similar efficacy. Subsequent studies showed atropine to be a comparable alternative to patching, not superior. Other studies have also shown that a significant number of children improve with optical correction alone, which should be tried first.

Question 17: What is the most common site of distant metastasis from uveal melanoma?

Brain
Liver (Correct answer)
Lung
Bone

Correct answer: Liver

The liver is the predominant site of metastasis in uveal melanoma, with over 90% of patients with metastatic disease having hepatic involvement due to hematogenous spread.

Question 18: A glaucoma patient is started on oral acetazolamide. Which of the following is a common systemic side effect that the patient should be warned about?

Bronchodilation
Paresthesias of fingers and toes (Correct answer)
Hyperkalemia
Hypertension

Correct answer: Paresthesias of fingers and toes

Oral carbonic anhydrase inhibitors like acetazolamide frequently cause systemic side effects. Among the most common are paresthesias (a tingling or "pins and needles" sensation) in the extremities, a metallic taste, fatigue, and metabolic acidosis.

Question 19: Which of the following is the most common benign orbital tumor in adults?

Capillary hemangioma
Lymphangioma
Dermoid cyst
Cavernous hemangioma (Correct answer)

Correct answer: Cavernous hemangioma

The cavernous hemangioma is recognized as the most common benign orbital tumor in adults. This slow-growing vascular lesion typically presents with gradual, painless proptosis (bulging of the eye) and can cause visual disturbances if it compresses the optic nerve. Its characteristic appearance on imaging helps differentiate it from other orbital masses.

Question 20: What is the first-line treatment approach for bilateral retinoblastoma in modern practice?

Observation with serial fundus examination
External beam radiation therapy
Bilateral enucleation
Systemic chemoreduction followed by focal consolidation (Correct answer)

Correct answer: Systemic chemoreduction followed by focal consolidation

Modern treatment for bilateral retinoblastoma uses systemic chemoreduction (carboplatin, vincristine, etoposide) followed by focal consolidation (laser, cryotherapy) to achieve globe salvage while avoiding radiation-related secondary malignancies.

Question 21: Which of the following is characteristic of Duane Retraction Syndrome?

Globe retraction (Correct answer)
Increased intraocular pressure
Optic nerve pallor
Proptosis

Correct answer: Globe retraction

Duane Retraction Syndrome is a congenital eye movement disorder characterized by abnormal innervation of the extraocular muscles. Its hallmark features include limited abduction (outward movement) and/or adduction (inward movement), and a paradoxical retraction of the globe into the orbit upon attempted adduction, often accompanied by narrowing of the palpebral fissure.

Question 22: Which of the following is a hallmark sign of anterior uveitis?

Optic disc cupping
Retinal detachment
Cell and flare (Correct answer)
Papilledema

Correct answer: Cell and flare

Anterior uveitis is characterized by inflammation within the anterior chamber of the eye. The hallmark signs, 'cell and flare,' refer to the presence of inflammatory cells (cells) and protein exudates (flare) suspended in the aqueous humor. These are visible upon slit-lamp examination and indicate a breakdown of the blood-aqueous barrier due to inflammation.

Question 23: A patient who underwent a trabeculectomy 2 months ago presents with a low IOP of 4 mmHg, a shallow anterior chamber, and choroidal folds on fundus examination. What is the most likely diagnosis?

Hypotony maculopathy (Correct answer)
Encapsulated bleb
Malignant glaucoma
Blebitis

Correct answer: Hypotony maculopathy

Hypotony maculopathy is a condition characterized by low IOP leading to chorioretinal folds, optic disc swelling, and decreased vision. It is a known complication of glaucoma filtration surgery, often resulting from over-filtration or a bleb leak.

Question 24: What is the most appropriate initial treatment for amblyopia in a 5-year-old?

Systemic antibiotics
Surgical correction
Eye patching (Correct answer)
Contact lenses

Correct answer: Eye patching

Amblyopia is a developmental disorder where vision in one eye is reduced because the eye and brain are not working together properly. The most appropriate initial treatment for amblyopia in a child is eye patching of the stronger eye. This forces the weaker, amblyopic eye to work harder, stimulating its visual development and improving acuity.

Question 25: The Collaborative Ocular Melanoma Study (COMS) demonstrated equivalence between enucleation and which treatment for medium-sized choroidal melanoma?

Proton beam radiation
External beam radiation
Transpupillary thermotherapy
I-125 episcleral plaque brachytherapy (Correct answer)

Correct answer: I-125 episcleral plaque brachytherapy

COMS demonstrated that I-125 episcleral plaque brachytherapy provides equivalent 5-year overall survival to enucleation for medium-sized choroidal melanomas.

Question 26: Which test is most useful for evaluating posterior uveitis?

Pachymetry
Tonometry
Visual field test
Fluorescein angiography (Correct answer)

Correct answer: Fluorescein angiography

Fluorescein angiography is a highly useful diagnostic tool for evaluating posterior uveitis. This test involves injecting a fluorescent dye into the bloodstream and taking rapid photographs of the retina. It helps visualize the retinal and choroidal vasculature, detect leakage from inflamed vessels, identify areas of ischemia, and assess macular edema, all of which are crucial for diagnosing and managing posterior segment inflammation.

Question 27: What is the most common primary intraocular malignancy in adults?

Metastatic carcinoma
Uveal melanoma (Correct answer)
Primary intraocular lymphoma
Retinoblastoma

Correct answer: Uveal melanoma

Uveal melanoma is the most common primary intraocular malignancy in adults, arising from melanocytes in the uveal tract (iris, ciliary body, choroid).

Question 28: A 75-year-old patient reports sudden, painless, distorted central vision in one eye. OCT reveals subretinal fluid and intraretinal cysts. What is the most appropriate initial treatment?

Photodynamic therapy
Intravitreal anti-VEGF injection (Correct answer)
Laser photocoagulation
Observation with an Amsler grid

Correct answer: Intravitreal anti-VEGF injection

The findings are classic for neovascular or 'wet' age-related macular degeneration (AMD). The standard of care and first-line treatment is intravitreal injection of an anti-vascular endothelial growth factor (anti-VEGF) agent to inhibit the growth of abnormal choroidal vessels and reduce fluid leakage.

Question 29: Which genetic mutation is most commonly associated with uveal melanoma?

GNAQ/GNA11 (Correct answer)
RB1
BRAF V600E
KRAS

Correct answer: GNAQ/GNA11

GNAQ and GNA11 mutations are found in approximately 80-90% of uveal melanomas, constitutively activating the MAPK signaling pathway.

Question 30: Which finding is most characteristic of granulomatous uveitis?

Macular hole
Fine keratic precipitates
Optic disc hemorrhages
Mutton-fat keratic precipitates (Correct answer)

Correct answer: Mutton-fat keratic precipitates

Granulomatous uveitis is characterized by a specific type of inflammatory response. The most characteristic finding is the presence of 'mutton-fat' keratic precipitates (KPs) on the corneal endothelium. These KPs are large, greasy-looking, yellowish-white deposits composed of macrophages and epithelioid cells, indicative of a granulomatous inflammatory process.

Question 31: Which of the following is considered the strongest predisposing risk factor for the development of a rhegmatogenous retinal detachment (RRD)?

Posterior vitreous detachment (PVD). (Correct answer)
Lattice degeneration.
High myopia.
Blunt ocular trauma.

Correct answer: Posterior vitreous detachment (PVD).

While high myopia, lattice degeneration, and trauma are all significant risk factors for RRD, the inciting event for the vast majority of RRDs is a posterior vitreous detachment (PVD). The dynamic vitreoretinal traction created during a PVD is what causes the retinal break (the 'rhegma'), allowing liquefied vitreous to enter the subretinal space. The other factors increase the likelihood that a PVD will result in a retinal break and subsequent detachment.

Question 32: A 68-year-old male with a history of poorly controlled type 2 diabetes presents with a sudden, painless floater in his right eye. Fundus examination reveals neovascularization of the disc (NVD) greater than 1/3 disc area and a mild vitreous hemorrhage. According to the Diabetic Retinopathy Study (DRS), what is the most appropriate next step in management?

Observation with strict glucose control.
Intravitreal anti-VEGF injection alone.
Prompt panretinal photocoagulation (PRP). (Correct answer)
Focal laser photocoagulation to the macula.

Correct answer: Prompt panretinal photocoagulation (PRP).

The patient presents with high-risk characteristics (HRCs) of proliferative diabetic retinopathy (PDR), specifically NVD greater than 1/3 disc area and an associated vitreous hemorrhage. The landmark Diabetic Retinopathy Study (DRS) demonstrated that prompt panretinal photocoagulation (PRP) reduces the risk of severe vision loss by over 50% in eyes with HRCs. While anti-VEGF is also a treatment for PDR, PRP is the established gold standard based on the DRS findings for high-risk disease. Observation is inappropriate given the high risk of progression, and focal laser is for macular edema, not PDR.

Question 33: A patient presents with a sudden onset of numerous floaters and flashes of light, followed by a 'curtain' coming down over their vision. This presentation is most classic for which type of retinal detachment?

Exudative
Tractional
Rhegmatogenous (Correct answer)
Serous

Correct answer: Rhegmatogenous

Rhegmatogenous retinal detachment is caused by a tear or break in the retina, allowing vitreous fluid to seep underneath and separate the retina from the underlying retinal pigment epithelium. The initial tear often causes symptoms of flashes (photopsia) and floaters.

Question 34: Which chromosomal abnormality in uveal melanoma is most strongly associated with metastatic risk?

Monosomy 3 (Correct answer)
Trisomy 8q
Loss of 1p
Gain of 6p

Correct answer: Monosomy 3

Monosomy 3 (loss of one copy of chromosome 3) is the single most significant prognostic cytogenetic marker in uveal melanoma, strongly associated with high metastatic risk.

Question 35: A 28-year-old female presents with a 5-day history of progressively worsening, painful vision loss in her right eye. Her visual acuity is 20/200 OD. Examination reveals a right relative afferent pupillary defect (RAPD) and profound loss of color vision. The optic disc appears normal. What is the most likely diagnosis?

Compressive optic neuropathy
Retrobulbar optic neuritis (Correct answer)
Non-arteritic anterior ischemic optic neuropathy (NAION)
Leber hereditary optic neuropathy (LHON)

Correct answer: Retrobulbar optic neuritis

This presentation—subacute, painful monocular vision loss with an RAPD and dyschromatopsia in a young adult—is classic for optic neuritis. [19, 25] When the optic disc appears normal, it is termed retrobulbar optic neuritis, as the inflammation is behind the globe. [17, 21] This condition has a strong association with multiple sclerosis. NAION is typically sudden, painless, and occurs in older patients. LHON is painless, and compressive neuropathy is typically gradual and painless.

Question 36: A young adult complains of progressive night blindness and peripheral vision loss. Fundus examination reveals mid-peripheral bone-spicule pigmentation, attenuated retinal arterioles, and waxy pallor of the optic disc. This triad of findings is classic for which condition?

Cone-rod dystrophy
Gyrate atrophy
Retinitis pigmentosa (Correct answer)
Choroideremia

Correct answer: Retinitis pigmentosa

The classic triad of bone-spicule pigmentation, attenuated vessels, and waxy optic disc pallor is pathognomonic for retinitis pigmentosa. This group of inherited retinal dystrophies primarily affects the rod photoreceptors, leading to nyctalopia (night blindness) and progressive peripheral visual field loss.

Question 37: Which of the following visual field defects is most characteristic of a lesion, such as a pituitary adenoma, compressing the optic chiasm from below?

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

Correct answer: Bitemporal hemianopia

A lesion compressing the optic chiasm, where the nasal retinal fibers from each eye cross, characteristically damages these crossing fibers first. [7] Since the nasal retinal fibers perceive the temporal visual field, this damage results in a bitemporal hemianopia (loss of vision in the temporal half of the visual field for both eyes). [6, 7] This pattern is a classic sign of chiasmal compression. [6]

Question 38: A Jackson Cross Cylinder (JCC) is used during subjective refraction to:

Neutralize the retinoscopy reflex.
Refine the axis and power of the astigmatic correction. (Correct answer)
Determine the spherical equivalent.
Measure the accommodative amplitude.

Correct answer: Refine the axis and power of the astigmatic correction.

The Jackson Cross Cylinder is a lens that combines an equal-power plus and minus cylinder with axes 90 degrees apart. It is used to refine both the axis of the correcting cylinder by straddling the estimated axis and the power of the cylinder by aligning its axes with the cylinder's axis.

Question 39: A 68-year-old male with long-standing hypertension and diabetes presents with the acute onset of painless, horizontal diplopia. Examination reveals an isolated abduction deficit of the left eye. The remainder of his ocular and neurological exam is normal. What is the most likely diagnosis?

Giant cell arteritis
Microvascular sixth nerve palsy (Correct answer)
Cavernous sinus thrombosis
Myasthenia gravis

Correct answer: Microvascular sixth nerve palsy

The most common cause of an isolated, non-traumatic sixth nerve palsy in an older patient with vasculopathic risk factors like diabetes and hypertension is a microvascular ischemic event. [8, 27] Cavernous sinus thrombosis would typically present with multiple cranial nerve palsies and proptosis. Myasthenia gravis often presents with ptosis and variable diplopia. Giant cell arteritis is a consideration but is less likely without associated symptoms like headache, jaw claudication, or scalp tenderness.

Question 40: A patient's prescription is -2.00 -1.00 x 180. What is the total power of this lens in the 90-degree meridian?

-2.00 D
-2.50 D
-3.00 D (Correct answer)
-1.00 D

Correct answer: -3.00 D

The power in the principal meridians of a spherocylindrical lens can be determined by analyzing the prescription. The sphere power (-2.00 D) is present in all meridians. The cylinder power (-1.00 D) is at its maximum at 90 degrees away from its axis. The axis is 180, so 90 degrees away is the 90-degree meridian. Therefore, the total power in the 90th meridian is the sum of the sphere and cylinder powers: -2.00 D + (-1.00 D) = -3.00 D.

Question 41: Conjunctival melanoma most frequently arises from which precursor lesion?

Conjunctival papilloma
Primary acquired melanosis (PAM) with atypia (Correct answer)
Pinguecula
Conjunctival compound nevus

Correct answer: Primary acquired melanosis (PAM) with atypia

Conjunctival melanoma most commonly (75%) arises from primary acquired melanosis with atypia, which carries a significant risk of malignant transformation proportional to the degree of cytologic atypia.

Question 42: A 68-year-old patient with newly diagnosed primary open-angle glaucoma (POAG) has an IOP of 28 mmHg in both eyes and early glaucomatous optic neuropathy. What is the most appropriate initial medical therapy?

Timolol
Dorzolamide
Latanoprost (Correct answer)
Brimonidine

Correct answer: Latanoprost

Prostaglandin analogs are the first-line treatment for POAG due to their potent IOP-lowering effect, once-daily dosing, and favorable side-effect profile. They work by increasing uveoscleral outflow of aqueous humor.

Question 43: Which ocular tumor is associated with von Hippel-Lindau (VHL) disease?

Choroidal melanoma
Retinal capillary hemangioma (hemangioblastoma) (Correct answer)
Choroidal osteoma
Retinoblastoma

Correct answer: Retinal capillary hemangioma (hemangioblastoma)

VHL disease (caused by VHL gene mutations) is associated with retinal capillary hemangiomas (hemangioblastomas) that can cause exudative retinal detachment and vision loss if untreated.

Question 44: A 72-year-old patient presents with severe pain, redness, and rapidly decreasing vision 3 days after uncomplicated cataract surgery. Examination reveals a significant anterior chamber reaction with a hypopyon. What is the most urgent diagnosis to consider?

Uveitis-glaucoma-hyphema (UGH) syndrome
Retained lens fragment
Toxic anterior segment syndrome (TASS)
Acute post-operative endophthalmitis (Correct answer)

Correct answer: Acute post-operative endophthalmitis

Acute post-operative endophthalmitis is a devastating intraocular infection that can occur after any intraocular surgery. It typically presents within the first week with severe pain, vision loss, and signs of intense inflammation like a hypopyon. It is an ophthalmologic emergency requiring immediate intervention.

Question 45: A contact lens wearer presents with severe eye pain out of proportion to clinical signs and a ring infiltrate. Acanthamoeba keratitis is suspected. Effective treatment typically requires:

Intensive topical corticosteroids.
Oral antifungal agents like fluconazole.
Combination therapy with a biguanide and a diamidine. (Correct answer)
Monotherapy with a topical fourth-generation fluoroquinolone.

Correct answer: Combination therapy with a biguanide and a diamidine.

Treatment of Acanthamoeba keratitis is challenging and requires long-term therapy targeting both the active trophozoite and the dormant cyst forms. The standard of care involves combination therapy with a biguanide (e.g., PHMB) and a diamidine (e.g., propamidine), often administered hourly initially.

Question 46: Which ocular tumor is the most common primary intraocular malignancy in children?

Uveal melanoma
Retinoblastoma (Correct answer)
Choroidal osteoma
Primary intraocular lymphoma

Correct answer: Retinoblastoma

Retinoblastoma is the most common primary intraocular malignancy in children, occurring in approximately 1 in 15,000-20,000 live births and arising from primitive retinal precursor cells.

Question 47: What is the primary physiological cause of presbyopia?

Flattening of the corneal curvature.
Decreased elasticity and hardening of the crystalline lens. (Correct answer)
Elongation of the axial length of the eye.
Weakening of the ciliary muscle.

Correct answer: Decreased elasticity and hardening of the crystalline lens.

Presbyopia is the age-related loss of accommodation. The primary cause is the progressive hardening (sclerosis) and loss of elasticity of the crystalline lens, which prevents it from changing shape sufficiently to focus on near objects, even with normal ciliary muscle contraction.

Question 48: A pediatrician performing a red reflex test on a 6-month-old infant notes a white pupillary reflex (leukocoria) in the right eye. While retinoblastoma is the most life-threatening cause, what is the most common overall cause of leukocoria in children?

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

Correct answer: Congenital cataract

While retinoblastoma is the most feared and life-threatening cause of leukocoria, congenital cataract is statistically the most common cause. It is critical to refer any child with leukocoria for an urgent, dilated ophthalmologic examination to differentiate the cause. Coats' disease, persistent fetal vasculature, and retinoblastoma are other important causes in the differential diagnosis but are less common than congenital cataracts.

Question 49: A patient has been using topical prednisolone acetate 1% four times daily for several months for chronic uveitis. Which of the following is the most common and significant ocular side effect associated with long-term use?

Optic nerve atrophy
Corneal melt
Elevated intraocular pressure and cataract formation. (Correct answer)
Miosis

Correct answer: Elevated intraocular pressure and cataract formation.

The two most common and clinically significant side effects of long-term topical corticosteroid use are the development of steroid-induced glaucoma (elevated IOP) and posterior subcapsular cataracts. Regular monitoring of IOP and lens status is crucial for any patient on chronic topical steroid therapy.

Question 50: Retinoblastoma results from biallelic inactivation of which tumor suppressor gene?

TP53
BRCA1
RB1 (Correct answer)
NF1

Correct answer: RB1

Retinoblastoma results from biallelic inactivation of the RB1 tumor suppressor gene, illustrating Knudson's classic 'two-hit' model of carcinogenesis.

Question 51: A 55-year-old female presents with sudden, severe right eye pain, blurred vision, and nausea. On examination, her intraocular pressure (IOP) is 58 mmHg, the cornea is hazy, and the pupil is mid-dilated and nonreactive. Gonioscopy of the left eye reveals a narrow, occludable angle. What is the most appropriate definitive initial treatment for the affected right eye after the acute attack is medically controlled?

Laser peripheral iridotomy (LPI) (Correct answer)
Topical prostaglandin analog therapy
Selective laser trabeculoplasty (SLT)
Trabeculectomy

Correct answer: Laser peripheral iridotomy (LPI)

This patient is experiencing an acute angle-closure glaucoma attack. The definitive treatment to relieve pupillary block and prevent recurrence is a laser peripheral iridotomy (LPI). This procedure creates a new channel for aqueous humor to flow from the posterior to the anterior chamber. Prostaglandin analogs are generally used for open-angle glaucoma. SLT is used for open-angle glaucoma and is not effective for angle-closure. Trabeculectomy is a surgical option for more advanced or uncontrolled glaucoma, not the initial definitive procedure for acute angle-closure.

Question 52: A patient with Fuchs' dystrophy and significant corneal edema but a clear stroma is a candidate for a corneal transplant. Which procedure would be most appropriate to selectively replace the diseased tissue?

Descemet's Membrane Endothelial Keratoplasty (DMEK) (Correct answer)
Penetrating Keratoplasty (PKP)
Deep Anterior Lamellar Keratoplasty (DALK)
Phototherapeutic Keratectomy (PTK)

Correct answer: Descemet's Membrane Endothelial Keratoplasty (DMEK)

Descemet's Membrane Endothelial Keratoplasty (DMEK) is a type of partial-thickness corneal transplant that replaces only the patient's diseased endothelium and Descemet's membrane. It is the preferred procedure for isolated endothelial dysfunction like Fuchs' dystrophy as it offers faster visual recovery and lower rejection rates compared to full-thickness transplants.

Question 53: During subjective refraction to refine astigmatism, a Jackson Cross Cylinder (JCC) is used. What is the primary function of this instrument?

To determine the spherical equivalent of the prescription.
To assess the patient's binocular balance.
To measure the intraocular pressure.
To refine the cylinder axis and power. (Correct answer)

Correct answer: To refine the cylinder axis and power.

The Jackson Cross Cylinder is a specialized lens used to fine-tune the correction for astigmatism. It helps the practitioner to accurately determine both the correct axis of the cylinder and the precise amount of cylindrical power needed by presenting the patient with two choices to determine which is clearer.

Question 54: Intra-arterial chemotherapy (IAC) for retinoblastoma is delivered directly into which artery?

Lacrimal artery
Posterior ciliary artery
Ophthalmic artery (Correct answer)
Central retinal artery

Correct answer: Ophthalmic artery

IAC involves superselective catheterization of the ophthalmic artery via femoral artery approach to deliver high local chemotherapy concentrations (melphalan, topotecan) while minimizing systemic toxicity.

Question 55: Which systemic disease is most commonly associated with HLA-B27 positive uveitis?

Rheumatoid arthritis
Multiple sclerosis
Ankylosing spondylitis (Correct answer)
Systemic lupus erythematosus

Correct answer: Ankylosing spondylitis

HLA-B27 positive uveitis is strongly associated with a group of systemic inflammatory diseases known as spondyloarthropathies. Among these, ankylosing spondylitis is the most common systemic condition linked to acute anterior uveitis in individuals positive for the HLA-B27 gene. This genetic marker indicates a predisposition to both the ocular and systemic inflammatory processes.

Question 56: A 50-year-old outdoor worker presents with a fleshy, triangular growth extending from the nasal conjunctiva onto the cornea. What is the most likely diagnosis?

Pterygium (Correct answer)
Conjunctival nevus
Squamous cell carcinoma
Pinguecula

Correct answer: Pterygium

A pterygium is a fibrovascular growth of the conjunctiva that crosses the limbus and encroaches onto the cornea, often in a triangular shape. It is strongly associated with chronic ultraviolet light exposure. A pinguecula, in contrast, is a degenerative lesion that is confined to the conjunctiva and does not cross onto the cornea.

Question 57: A 9-month-old infant presents with a history of persistent tearing and mild mattering in the left eye since birth. The eye is not red, and the cornea is clear. The mother reports that symptoms are worse in the cold or wind. What is the most appropriate initial management for this patient?

Prescription of a topical antibiotic-steroid combination.
Observation and instruction on digital lacrimal sac massage. (Correct answer)
Immediate surgical probing of the nasolacrimal duct.
Referral for a dacryocystorhinostomy (DCR).

Correct answer: Observation and instruction on digital lacrimal sac massage.

This presentation is classic for congenital nasolacrimal duct obstruction (NLDO). The vast majority of cases (>90%) resolve spontaneously within the first year of life. Therefore, the most appropriate initial management is conservative, consisting of observation and teaching the parent how to perform Crigler (digital lacrimal sac) massage to increase hydrostatic pressure and open the membranous obstruction at the valve of Hasner. Surgical probing is typically deferred until after 12 months of age if the condition persists. Antibiotics are only for active infection (dacryocystitis), and steroids are not indicated. DCR is a much more invasive surgery reserved for complex cases or failures of less invasive procedures.

Question 58: A 75-year-old female reports gradual blurring of her central vision and difficulty reading. Optical coherence tomography (OCT) reveals large, soft drusen and retinal pigment epithelium (RPE) atrophy. A fluorescein angiogram (FA) is performed. Which of the following FA findings would be most consistent with a diagnosis of neovascular (wet) age-related macular degeneration (AMD) rather than the non-neovascular (dry) form?

Window defects corresponding to areas of RPE atrophy.
Slow, late staining of drusen.
Early hyperfluorescence with late leakage from an undefined source. (Correct answer)
Blocking of fluorescence due to pigment clumping.

Correct answer: Early hyperfluorescence with late leakage from an undefined source.

Early hyperfluorescence that increases in intensity and spreads into the surrounding tissue (leakage) in the late phases of the angiogram is the hallmark of choroidal neovascularization (CNV), the defining feature of wet AMD. Window defects, blocking, and drusen staining are characteristic findings of dry AMD, representing RPE atrophy, pigment, and altered Bruch's membrane, respectively, but not active leakage from new vessels.

Question 59: What is the primary mechanism of action by which prostaglandin analogs, such as latanoprost, lower intraocular pressure (IOP)?

Decreasing aqueous humor production by the ciliary body.
Increasing aqueous humor outflow through the uveoscleral pathway. (Correct answer)
Constricting the pupil to increase outflow (miosis).
Increasing aqueous humor outflow through the trabecular meshwork.

Correct answer: Increasing aqueous humor outflow through the uveoscleral pathway.

Prostaglandin analogs are first-line therapy for open-angle glaucoma. Their primary mechanism is to increase the outflow of aqueous humor through the uveoscleral (or unconventional) pathway by remodeling the extracellular matrix in the ciliary muscle.

Question 60: When interpreting a Humphrey Visual Field (HVF) 24-2 test for a glaucoma suspect, which of the following patterns is most characteristic of early glaucomatous damage?

A bitemporal hemianopsia
An enlarged blind spot
A nasal step respecting the horizontal midline (Correct answer)
A central scotoma

Correct answer: A nasal step respecting the horizontal midline

Early glaucomatous visual field defects typically correspond to the pattern of nerve fiber layer loss. A nasal step, which is a scotoma just above or below the horizontal midline in the nasal field, is a classic early sign. This occurs due to damage to the arcuate nerve fibers. A central scotoma is more typical of macular disease or advanced glaucoma. Bitemporal hemianopsia suggests a chiasmal lesion. An enlarged blind spot can be seen in glaucoma but is less specific than a nasal step.

Question 61: What is the most common visual field defect in pituitary adenoma?

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

Correct answer: Bitemporal hemianopia

A pituitary adenoma typically grows superiorly from the sella turcica, compressing the optic chiasm. The optic chiasm is where nasal retinal fibers from both eyes cross, carrying information from the temporal visual fields. Compression of these crossing fibers leads to a characteristic bitemporal hemianopia, meaning loss of vision in the outer half of both visual fields.

Question 62: Which condition presents with a white pupillary reflex in a child?

Retinoblastoma (Correct answer)
Strabismus
Astigmatism
Nystagmus

Correct answer: Retinoblastoma

Retinoblastoma is the most common primary intraocular malignancy in children, and its classic presenting sign is leukocoria, or a white pupillary reflex. This 'cat's eye reflex' occurs when light reflects off the tumor mass within the eye. Early detection is critical for successful treatment and preservation of vision and life.

Question 63: Which cranial nerve palsy most commonly causes vertical diplopia?

Oculomotor nerve (CN III)
Trochlear nerve (CN IV) (Correct answer)
Abducens nerve (CN VI)
Optic nerve (CN II)

Correct answer: Trochlear nerve (CN IV)

The trochlear nerve (CN IV) innervates the superior oblique muscle, which primarily depresses and intorts the eye. A palsy of this nerve weakens the superior oblique, leading to an inability to depress the eye, especially when adducted. This results in vertical diplopia, often worse when looking down or reading, and patients may adopt a head tilt to compensate.

Question 64: What is the hallmark CT finding of retinoblastoma in children?

Homogeneous enhancement after contrast
Hypodense mass with ring enhancement
Isodense mass with cystic change
Calcification within the intraocular mass (Correct answer)

Correct answer: Calcification within the intraocular mass

Calcification within the intraocular tumor is the hallmark CT finding of retinoblastoma, present in approximately 90-95% of cases and helpful in distinguishing it from other leukocoric conditions.

Question 65: A patient's Humphrey visual field test shows a dense scotoma that begins at the blind spot, arches over the macula, and ends at the horizontal raphe. What is this classic glaucomatous defect called?

Arcuate scotoma (Correct answer)
Altitudinal defect
Central scotoma
Nasal step

Correct answer: Arcuate scotoma

An arcuate scotoma, also known as a Bjerrum scotoma, is a classic visual field defect in glaucoma. It corresponds to damage to a bundle of retinal nerve fibers that arch from the optic disc around the macula.

Question 66: A patient develops acute, painful vision loss, hypopyon, and severe intraocular inflammation three days after uncomplicated cataract surgery. What is the most common causative organism for acute postoperative endophthalmitis?

Candida albicans
Pseudomonas aeruginosa
Streptococcus pneumoniae
Staphylococcus epidermidis (Correct answer)

Correct answer: Staphylococcus epidermidis

The most common organisms causing acute postoperative endophthalmitis are coagulase-negative staphylococci, with Staphylococcus epidermidis being the most frequent isolate. These bacteria are part of the normal flora of the patient's own ocular surface and can be introduced into the eye during surgery.

Question 67: Which cranial nerve is commonly affected in a blowout fracture of the orbit?

Optic nerve
Olfactory nerve
Trochlear nerve
Infraorbital nerve (Correct answer)

Correct answer: Infraorbital nerve

A blowout fracture of the orbit typically involves the floor or medial wall, which are thin and prone to fracture from blunt trauma. The infraorbital nerve, a branch of the trigeminal nerve (CN V), runs through the orbital floor. Damage to this nerve during a blowout fracture commonly results in numbness or altered sensation in the cheek, upper lip, and upper teeth on the affected side.

Question 68: A 68-year-old male with primary open-angle glaucoma is being monitored for progression. His intraocular pressure is stable on a prostaglandin analog. Which finding on spectral-domain optical coherence tomography (SD-OCT) of the retinal nerve fiber layer (RNFL) is most indicative of early glaucomatous progression?

Localized thinning of the inferotemporal or superotemporal quadrant that respects the horizontal midline (Correct answer)
An increase in the overall signal strength of the scan
Focal thinning of the inferotemporal quadrant that crosses the horizontal midline
Diffuse thinning of the entire RNFL

Correct answer: Localized thinning of the inferotemporal or superotemporal quadrant that respects the horizontal midline

Early glaucomatous damage typically manifests as localized thinning of the retinal nerve fiber layer, most commonly in the inferotemporal and superotemporal arcuate bundles. This damage respects the horizontal raphe. Diffuse thinning is less specific and can be seen in other conditions or advanced disease. Crossing the midline is not a typical pattern for early glaucoma. Increased signal strength is a measure of scan quality, not a sign of pathology.

Question 69: According to Snell's Law, when a ray of light passes from a medium of lower refractive index (like air) to a medium of higher refractive index (like the cornea) at an oblique angle, the ray of light will:

Be completely reflected.
Bend away from the normal.
Bend toward the normal. (Correct answer)
Continue in a straight line without deviation.

Correct answer: Bend toward the normal.

Snell's Law (n1 * sin(θ1) = n2 * sin(θ2)) describes how light refracts at the interface of two different media. When light enters a denser medium (higher refractive index n2 > n1), its speed decreases, causing it to bend toward the normal, which is an imaginary line perpendicular to the surface at the point of incidence.

Question 70: A patient presents 12 hours after cataract surgery with diffuse limbus-to-limbus corneal edema, mild anterior chamber reaction, and no vitritis. The symptoms are improving with topical steroids. This presentation is most consistent with:

Uveitis-Glaucoma-Hyphema (UGH) Syndrome
Toxic Anterior Segment Syndrome (TASS) (Correct answer)
Retained lens fragment
Acute postoperative endophthalmitis

Correct answer: Toxic Anterior Segment Syndrome (TASS)

TASS is a sterile, non-infectious inflammatory reaction typically occurring within 12-48 hours of anterior segment surgery. It is caused by a toxic substance introduced into the eye, leading to characteristic diffuse corneal edema and a rapid response to intensive topical corticosteroids, distinguishing it from infectious endophthalmitis which has a later onset and involves the vitreous.

Question 71: Which test is best to evaluate binocularity in young children?

Retinoscopy
Tonometry
Ophthalmoscopy
Worth 4-dot test (Correct answer)

Correct answer: Worth 4-dot test

The Worth 4-dot test is a simple and effective clinical tool used to assess a patient's binocularity, specifically the presence and degree of fusion, suppression, or diplopia. It presents four colored lights (two green, one red, one white) to each eye through red/green glasses, allowing the examiner to determine if the patient is using both eyes together or suppressing one image.

Question 72: What is the most common form of intraocular malignancy overall, including secondary tumors?

Iris melanoma
Choroidal metastases (Correct answer)
Uveal melanoma
Primary intraocular lymphoma

Correct answer: Choroidal metastases

Choroidal metastases are the most common intraocular malignancy overall, with breast and lung cancer being the most frequent primary sources, reflecting hematogenous spread to the highly vascular choroid.

Question 73: Which finding is most consistent with Horner's syndrome?

Exophthalmos
Ptosis and miosis (Correct answer)
Strabismus
Mydriasis

Correct answer: Ptosis and miosis

Horner's syndrome results from a disruption of the sympathetic nerve pathway to the eye and face. The classic triad includes ptosis (drooping of the upper eyelid due to denervation of Müller's muscle), miosis (constricted pupil due to denervation of the dilator pupillae muscle), and anhidrosis (decreased sweating on the affected side of the face). These signs collectively indicate sympathetic dysfunction.

Question 74: What is the primary cause of ectropion in elderly patients?

Trauma
Cicatricial scarring
Involutional changes (Correct answer)
Paralysis

Correct answer: Involutional changes

Involutional ectropion, common in elderly patients, is primarily caused by age-related weakening and laxity of the lower eyelid tissues. This includes horizontal laxity of the tarsal plate and canthal tendons, as well as weakening of the orbicularis oculi muscle. These changes lead to the outward turning of the eyelid margin, exposing the conjunctiva.

Question 75: A 55-year-old patient on long-term systemic prednisone for rheumatoid arthritis presents with a gradual, painless decrease in vision, particularly complaining of glare at night. Which type of cataract is most commonly associated with this clinical history?

Cortical
Traumatic rosette
Nuclear sclerotic
Posterior subcapsular (Correct answer)

Correct answer: Posterior subcapsular

Long-term corticosteroid use, both systemic and topical, is a well-established risk factor for the development of posterior subcapsular cataracts (PSC). These opacities form on the posterior surface of the lens, directly in the nodal point of the eye's optics, leading to significant glare and difficulty with reading vision.

Question 76: Which of the following classes of topical glaucoma medications primarily works by increasing the uveoscleral outflow of aqueous humor?

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

Correct answer: Prostaglandin analogs

Prostaglandin analogs (e.g., latanoprost, travoprost, bimatoprost) are a first-line treatment for open-angle glaucoma and lower intraocular pressure primarily by increasing the outflow of aqueous humor through the uveoscleral pathway. Beta-blockers and carbonic anhydrase inhibitors decrease aqueous production, while alpha-adrenergic agonists both decrease production and increase trabecular outflow.

Question 77: Snell's Law (n1 * sin(θ1) = n2 * sin(θ2)) is a fundamental principle in optics that describes:

The refraction of light as it passes between two different media. (Correct answer)
The diffraction of light as it passes through a small aperture.
The reflection of light from a smooth surface.
The relationship between focal length and lens power.

Correct answer: The refraction of light as it passes between two different media.

Snell's Law describes the relationship between the angles of incidence (θ1) and refraction (θ2) and the refractive indices (n1, n2) of two different isotropic media. It governs how much a light ray bends when it crosses the boundary from one medium to another, which is the fundamental basis for how lenses work.

Question 78: A 2-month-old infant presents with excessive tearing, light sensitivity, and eyelid squeezing. Examination reveals corneal clouding and an enlarged corneal diameter. This classic triad is most indicative of which condition?

Congenital cataract
Congenital glaucoma (Correct answer)
Nasolacrimal duct obstruction
Retinoblastoma

Correct answer: Congenital glaucoma

The classic triad of epiphora (tearing), photophobia (light sensitivity), and blepharospasm (eyelid squeezing) is highly suggestive of congenital glaucoma. The elevated IOP causes corneal edema (clouding) and stretching of the globe (buphthalmos).

Question 79: Which of the following findings is the defining feature that differentiates proliferative diabetic retinopathy (PDR) from severe non-proliferative diabetic retinopathy (NPDR)?

Cotton wool spots
Venous beading in 2 quadrants
Neovascularization of the disc (NVD) (Correct answer)
Severe retinal hemorrhages in 4 quadrants

Correct answer: Neovascularization of the disc (NVD)

The hallmark of proliferative diabetic retinopathy is neovascularization, which is the growth of new, abnormal blood vessels. These can occur on the optic disc (NVD) or elsewhere on the retina (NVE) and are a response to widespread retinal ischemia.

Question 80: Which condition is characterized by transient visual loss in one eye described as a 'curtain' descending?

Retinal detachment
Papilledema
Amaurosis fugax (Correct answer)
Macular degeneration

Correct answer: Amaurosis fugax

Amaurosis fugax describes a transient, monocular (one eye) visual loss, often characterized by a 'curtain' descending or ascending over the field of vision. It is typically caused by temporary ischemia to the retina or optic nerve, often due to an embolus from carotid artery disease or cardiac sources. This symptom warrants urgent investigation as it can be a warning sign of an impending stroke.

Question 81: A patient presents with a classic dendritic ulcer on the cornea, which is pathognomonic for herpes simplex virus (HSV) keratitis. What is the standard-of-care first-line treatment?

Topical corticosteroids
Intravenous ceftriaxone
Oral acyclovir
Topical ganciclovir or trifluridine (Correct answer)

Correct answer: Topical ganciclovir or trifluridine

For active epithelial HSV keratitis (dendritic or geographic ulcers), the standard of care is to use a topical antiviral agent like ganciclovir gel or trifluridine solution. Oral antivirals (acyclovir, valacyclovir) are also highly effective and are often used as an alternative or adjunct.

Question 82: Which of the following is the most common benign intraocular tumor in adults?

Choroidal hemangioma
Melanocytoma
Choroidal nevus (Correct answer)
Iris cyst

Correct answer: Choroidal nevus

Choroidal nevi are the most common benign intraocular tumors, found in approximately 6-7% of the adult Caucasian population, analogous to cutaneous nevi.

Question 83: The classic triad of signs for Horner's syndrome consists of ptosis, miosis, and which of the following?

Anhidrosis (Correct answer)
Lagophthalmos
Proptosis
Lid retraction

Correct answer: Anhidrosis

Horner's syndrome is caused by a disruption of the oculosympathetic pathway. This results in the characteristic triad of ipsilateral ptosis (mild drooping of the upper eyelid due to paralysis of Müller's muscle), miosis (a constricted pupil due to unopposed action of the parasympathetic system), and anhidrosis (decreased sweating on the affected side of the face). [9, 10, 12]

Question 84: A patient is evaluated for a suspected orbital floor "blowout" fracture after blunt trauma. Entrapment of which extraocular muscle is most commonly associated with restricted upgaze and vertical diplopia?

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

Correct answer: Inferior rectus

The orbital floor is the most common site for a blowout fracture. The inferior rectus muscle and adjacent orbital fat lie directly on the floor and are most susceptible to becoming entrapped within the fracture site in the maxillary sinus. [20, 22] This entrapment mechanically restricts the muscle's ability to relax during upgaze, leading to a limitation of elevation and vertical diplopia. [22]

Question 85: The bactericidal action of fourth-generation fluoroquinolones, such as moxifloxacin, is achieved by inhibiting which two bacterial enzymes?

RNA polymerase and reverse transcriptase
Beta-lactamase and penicillin-binding protein
Dihydropteroate synthase and dihydrofolate reductase
DNA gyrase and topoisomerase IV (Correct answer)

Correct answer: DNA gyrase and topoisomerase IV

Fluoroquinolones exert their bactericidal effect by inhibiting two essential bacterial enzymes involved in DNA synthesis: DNA gyrase (topoisomerase II) and topoisomerase IV. This dual-target mechanism is a key feature of later-generation fluoroquinolones, providing a broad spectrum of activity.

Question 86: What is the most common cause of amblyopia in children?

Nystagmus
Cataract
Refractive error
Strabismus (Correct answer)

Correct answer: Strabismus

Amblyopia, or 'lazy eye,' is reduced vision in an eye that did not develop normal sight during childhood. Strabismus, a misalignment of the eyes, is the most common cause because the brain suppresses the image from the misaligned eye to avoid double vision, leading to a lack of visual stimulation and development in that eye. Early detection and treatment are crucial for improving visual outcomes.

Question 87: A patient presents with a red, painful eye and foreign body sensation. Slit-lamp examination after fluorescein staining reveals a linear, branching epithelial lesion. This finding is pathognomonic for which condition?

Fungal keratitis
Herpes simplex keratitis (Correct answer)
Acanthamoeba keratitis
Corneal abrasion

Correct answer: Herpes simplex keratitis

A dendritic ulcer, which appears as a branching, tree-like lesion with terminal bulbs that stain with fluorescein, is the classic presentation of epithelial herpes simplex keratitis. It represents active viral replication within the corneal epithelium.

Question 88: Which of the following statements best describes the anatomical and physiological state of the lens nucleus in an elderly patient?

It is composed of the youngest lens fibers.
It is the primary site of metabolic activity in the lens.
It has the highest concentration of insoluble proteins and is dehydrated. (Correct answer)
It has the highest water content and lowest protein concentration.

Correct answer: It has the highest concentration of insoluble proteins and is dehydrated.

The lens nucleus is formed from the oldest, most compacted lens fibers. With age, these central fibers undergo sclerosis, losing water content and accumulating insoluble proteins, which contributes to the development of nuclear sclerotic cataracts and a decrease in accommodative amplitude.

Question 89: A patient with a prescription of +6.00 D sphere is refracted at a vertex distance of 15 mm. If the patient's new glasses are fit with a vertex distance of 10 mm, what is the compensated lens power required to provide the same effective power at the new distance?

+5.50 D
+6.00 D
+5.82 D
+6.19 D (Correct answer)

Correct answer: +6.19 D

Moving a plus lens closer to the eye results in a loss of effective plus power. To compensate for this, the power of the lens must be increased. The formula for vertex distance compensation is Fc = F / (1 - xF), where Fc is the compensated power, F is the original power, and x is the change in vertex distance in meters. In this case, F = +6.00 D and x = (15 mm - 10 mm) = 5 mm = 0.005 m. Fc = 6.00 / (1 - 0.005 * 6.00) = 6.00 / (1 - 0.03) = 6.00 / 0.97 ≈ +6.19 D.

Question 90: A patient has a steep vertical corneal meridian and a flat horizontal meridian. This type of astigmatism is known as:

Oblique astigmatism
With-the-rule astigmatism (Correct answer)
Against-the-rule astigmatism
Irregular astigmatism

Correct answer: With-the-rule astigmatism

With-the-rule (WTR) astigmatism is the most common type, where the vertical corneal meridian is steeper (has more power) than the horizontal meridian. This is typically corrected with a minus cylinder lens at or near the 180-degree axis.

Question 91: A 45-year-old female with Graves' disease presents with proptosis and diplopia. Imaging studies confirm enlargement of the extraocular muscles. Which extraocular muscle is most commonly and prominently affected in thyroid eye disease?

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

Correct answer: Inferior rectus

In thyroid eye disease (Graves' orbitopathy), the extraocular muscles become inflamed and enlarged. The order of frequency of involvement is typically remembered by the mnemonic "IM SLO" (Inferior rectus, Medial rectus, Superior rectus, Lateral rectus, Obliques). Therefore, the inferior rectus is the most commonly affected muscle, often leading to restricted upgaze. [1, 2, 5]

Question 92: The DecisionDx-UM gene expression profiling (GEP) test classifies uveal melanoma into which prognostic classes?

Stage I through Stage IV
Low, intermediate, and high risk
Grade 1 and Grade 2
Class 1A, Class 1B, and Class 2 (Correct answer)

Correct answer: Class 1A, Class 1B, and Class 2

The DecisionDx-UM GEP test classifies uveal melanoma into Class 1A (lowest metastatic risk), Class 1B (low-to-intermediate risk), and Class 2 (highest metastatic risk, ~72% 5-year metastasis rate).

Question 93: A 3-year-old child presents with an intermittent inward turning of the right eye, first noticed six months ago. The deviation is more prominent when the child is looking at toys up close. Cycloplegic refraction reveals +5.00 D sphere in both eyes. What is the most appropriate initial treatment?

Bilateral medial rectus muscle recession.
Botulinum toxin injection into the medial rectus muscles.
Prescription of the full cycloplegic hyperopic correction. (Correct answer)
Patching of the left eye for 6 hours per day.

Correct answer: Prescription of the full cycloplegic hyperopic correction.

This is a classic presentation of refractive accommodative esotropia. The esotropia is caused by the excessive accommodative effort required to see clearly through the significant uncorrected hyperopia, which in turn drives excessive convergence. The cornerstone and initial treatment is to prescribe the full cycloplegic refractive error in spectacles. This relaxes accommodation, thereby reducing the convergence drive and straightening the eyes. Surgery is only considered if a significant esotropia persists even with full spectacle correction (partially accommodative esotropia). Patching is a treatment for amblyopia, not the strabismus itself, and botulinum toxin is not the primary therapy.

Question 94: A 60-year-old female complains of blurry vision that is worse in the morning. Slit-lamp examination reveals corneal guttae and stromal edema. The primary pathology in this condition involves which corneal layer?

Endothelium (Correct answer)
Stroma
Bowman's layer
Epithelium

Correct answer: Endothelium

Fuchs' endothelial dystrophy is characterized by the progressive loss of corneal endothelial cells. This leads to the formation of guttae (excrescences on Descemet's membrane) and a breakdown of the endothelial pump function, resulting in corneal stromal and epithelial edema.

Question 95: A 55-year-old female presents with sudden onset of severe eye pain, blurred vision, and a mid-dilated, non-reactive pupil. Gonioscopy of the fellow eye reveals a narrow, occludable angle. What is the most likely underlying mechanism?

Neovascularization of the angle
Plateau iris syndrome
Pupillary block (Correct answer)
Phacomorphic mechanism

Correct answer: Pupillary block

Pupillary block is the most common mechanism for primary angle-closure glaucoma. It occurs when aqueous humor is blocked from passing from the posterior to the anterior chamber at the level of the pupil, causing the iris to bow forward and occlude the trabecular meshwork.

Question 96: A 2-day-old infant is noted to have bilateral leukocoria. What is the most common cause of bilateral, non-traumatic congenital cataracts?

Lowe syndrome
Idiopathic (Correct answer)
Galactosemia
Rubella infection

Correct answer: Idiopathic

While numerous genetic syndromes, metabolic disorders (like galactosemia), and intrauterine infections (like TORCH infections) can cause congenital cataracts, the most common finding is that they are idiopathic, meaning no specific cause is identified. Genetic mutations are often presumed in these cases but may not be part of a known syndrome.

Question 97: A patient with dry eye disease has rapid tear break-up time but normal Schirmer's test results. Examination reveals inspissated meibomian glands. This presentation is most consistent with which type of dry eye?

Allergic conjunctivitis
Evaporative dry eye (Correct answer)
Neurotrophic keratopathy
Aqueous-deficient dry eye

Correct answer: Evaporative dry eye

This patient has evaporative dry eye, most commonly caused by meibomian gland dysfunction (MGD). The glands produce a deficient lipid layer for the tear film, leading to rapid evaporation and instability (short tear break-up time), even if the aqueous production (measured by Schirmer's) is normal.

Question 98: Which of the following is a typical treatment for non-infectious anterior uveitis?

Systemic antibiotics
Topical corticosteroids (Correct answer)
Intravitreal antifungals
Beta-blockers

Correct answer: Topical corticosteroids

For non-infectious anterior uveitis, the primary treatment involves topical corticosteroids, such as prednisolone acetate eye drops. These medications effectively reduce inflammation in the anterior segment of the eye, alleviating symptoms like pain, redness, and photophobia. Mydriatic-cycloplegic agents are also often used to prevent synechiae and reduce ciliary spasm.

Question 99: A 62-year-old patient is diagnosed with normal-tension glaucoma (NTG). Their intraocular pressures are consistently 15-17 mmHg in both eyes. Humphrey Visual Field testing shows a dense superior arcuate scotoma in the right eye. According to the Collaborative Normal Tension Glaucoma Study (CNTGS), what is the recommended management approach?

Observation without treatment, as the IOP is within the normal range.
Surgical intervention with trabeculectomy as the first-line treatment.
Lowering the intraocular pressure by at least 30% from baseline. (Correct answer)
Initiation of a topical beta-blocker to lower IOP by 10%.

Correct answer: Lowering the intraocular pressure by at least 30% from baseline.

The Collaborative Normal Tension Glaucoma Study (CNTGS) demonstrated that lowering the IOP by at least 30% significantly slowed the rate of visual field progression in patients with NTG. Even though the initial pressure is within the 'normal' range, reducing it further is the only proven treatment to slow disease progression. Observation is only appropriate if there is no evidence of progression. A 10% reduction is less than the target established by the CNTGS, and surgery is typically reserved for cases that progress despite medical or laser therapy.

Question 100: A 22-year-old who sleeps in their soft contact lenses presents with severe eye pain, discharge, and a corneal infiltrate with an overlying epithelial defect. Which organism is most notoriously associated with this clinical scenario?

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

Correct answer: Pseudomonas aeruginosa

Pseudomonas aeruginosa is a gram-negative bacterium commonly associated with contact lens-related infectious keratitis, particularly with overnight wear. It can be highly virulent, causing rapid corneal destruction and perforation if not treated aggressively.

Question 101: What is the most common orbital malignancy in adults?

Rhabdomyosarcoma
Pleomorphic adenoma
Lymphoma (Correct answer)
Cavernous hemangioma

Correct answer: Lymphoma

Lymphoma is the most common orbital malignancy in adults, typically presenting as a painless salmon-colored subconjunctival or orbital mass in older patients.

Question 102: Sebaceous gland carcinoma of the eyelid is associated with which hereditary syndrome?

Muir-Torre syndrome (Correct answer)
Neurofibromatosis type 1
Gardner syndrome
Von Hippel-Lindau disease

Correct answer: Muir-Torre syndrome

Muir-Torre syndrome, caused by germline mutations in DNA mismatch repair genes (MLH1, MSH2), is associated with sebaceous neoplasms of the eyelid and concurrent or subsequent internal visceral malignancies.

Question 103: Primary intraocular lymphoma (PIOL) most commonly involves which ocular structures?

Vitreous and subretinal space (Correct answer)
Iris and anterior chamber
Choroid and sclera
Ciliary body and zonules

Correct answer: Vitreous and subretinal space

PIOL is typically a diffuse large B-cell lymphoma that most commonly involves the vitreous and subretinal space, often associated with CNS lymphoma.

Question 104: Which muscle is primarily involved in esotropia correction surgery?

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

Correct answer: Medial rectus

Esotropia is a form of strabismus where one or both eyes turn inward (converge). Surgical correction often involves weakening the medial rectus muscles, which are responsible for adducting (turning inward) the eye. By recessing (moving back) these muscles, their pulling power is reduced, allowing the eye to straighten.

Question 105: A patient looks 5 mm below the optical center of a lens with a power of -4.00 D in the vertical meridian. According to Prentice's Rule, what is the amount and direction of the induced prism?

4.0Δ Base Up
4.0Δ Base Down
2.0Δ Base Down
2.0Δ Base Up (Correct answer)

Correct answer: 2.0Δ Base Up

Prentice's Rule states that the prismatic effect (P) in prism diopters (Δ) is equal to the lens power (D) in diopters multiplied by the decentration (c) in centimeters. P = D x c. Here, D = -4.00 D and c = 5 mm = 0.5 cm. P = -4.00 * 0.5 = -2.0Δ. For a minus lens, the base of the prism is in the same direction as the decentration. Since the patient is looking down, the induced prism is Base Up.

Question 106: A 45-year-old patient is diagnosed with retinitis pigmentosa (RP). Which of the following findings constitutes the classic clinical triad observed on funduscopic examination for this condition?

Arteriolar attenuation, waxy optic disc pallor, and bone-spicule pigmentation. (Correct answer)
Choroidal folds, serous detachments, and vitritis.
Cotton-wool spots, venous beading, and intraretinal microvascular abnormalities (IRMA).
Optic disc drusen, macular edema, and peripheral hemorrhages.

Correct answer: Arteriolar attenuation, waxy optic disc pallor, and bone-spicule pigmentation.

The classic funduscopic triad of retinitis pigmentosa (RP) consists of retinal arteriolar attenuation, a waxy appearance of the optic disc pallor, and characteristic mid-peripheral intraretinal pigment migration in a bone-spicule pattern. The other answer choices describe findings associated with different retinal pathologies: option A can be seen in various conditions, option B suggests uveitis or a choroidal mass, and option D is characteristic of diabetic retinopathy.

Question 107: The effect of vertex distance is most clinically significant when prescribing spectacles for which of the following refractive errors?

-12.00 D sphere (Correct answer)
+3.00 D sphere with +1.00 D cylinder
-1.50 D sphere
+2.00 D sphere

Correct answer: -12.00 D sphere

Vertex distance is the distance between the back surface of the spectacle lens and the front of the cornea. Its effect on the effective power of the lens is negligible for low powers but becomes clinically significant for powers greater than +/- 4.00 diopters. For a high myope (-12.00 D), a small change in vertex distance can significantly alter the power delivered to the eye.

Question 108: A 7-year-old child is examined for an abnormal head posture. On examination, there is a marked limitation of abduction in the left eye. When the child attempts to adduct the left eye (look to the right), you observe narrowing of the palpebral fissure and globe retraction. What is the most likely diagnosis?

Sixth (abducens) nerve palsy
Möbius syndrome
Duane retraction syndrome (Correct answer)
Brown syndrome

Correct answer: Duane retraction syndrome

The combination of limited abduction with globe retraction and palpebral fissure narrowing on adduction is the pathognomonic triad for Duane retraction syndrome. This condition is a congenital cranial dysinnervation disorder, where the lateral rectus muscle is aberrantly innervated by a branch of the oculomotor (third) nerve. An isolated sixth nerve palsy causes an abduction deficit but not retraction on adduction. Brown syndrome restricts elevation in adduction. Möbius syndrome involves bilateral sixth and seventh nerve palsies.

Question 109: A patient's refraction is -4.50 +1.00 x 090. To correct this refractive error, what type of lens is required?

A plano-convex lens
A biconvex lens
A sphero-cylindrical convex lens
A sphero-cylindrical concave lens (Correct answer)

Correct answer: A sphero-cylindrical concave lens

The spherical component of the refraction is -4.50 diopters, which indicates myopia. Myopia is corrected with a concave (minus power) lens. The "+1.00 x 090" component indicates astigmatism, requiring a cylindrical correction, making the overall lens a sphero-cylindrical concave lens.

Question 110: Which tumor is most commonly associated with painless proptosis in children?

Rhabdomyosarcoma (Correct answer)
Capillary hemangioma
Neuroblastoma
Lymphoma

Correct answer: Rhabdomyosarcoma

Rhabdomyosarcoma is the most common primary malignant orbital tumor in children, typically presenting with rapidly progressive, painless proptosis. It originates from undifferentiated mesenchymal cells and can cause significant displacement of the globe. Early diagnosis and aggressive treatment are crucial due to its rapid growth and potential for metastasis.

Question 111: An 80-year-old male with a history of atrial fibrillation presents with sudden, profound, painless vision loss in his right eye. Fundus exam reveals a pale retina and a 'cherry-red spot' in the macula. What is the most likely diagnosis?

Central retinal artery occlusion (CRAO) (Correct answer)
Central retinal vein occlusion (CRVO)
Vitreous hemorrhage
Ischemic optic neuropathy

Correct answer: Central retinal artery occlusion (CRAO)

A central retinal artery occlusion (CRAO) presents with acute, painless, severe vision loss. The cherry-red spot occurs because the macula receives its blood supply from the underlying choroid, so it remains red while the surrounding ischemic retina becomes pale and opaque.

Question 112: Which condition presents with sudden, painful proptosis and ophthalmoplegia?

Orbital cellulitis (Correct answer)
Orbital tumor
Preseptal cellulitis
Graves orbitopathy

Correct answer: Orbital cellulitis

Orbital cellulitis is a severe infection of the tissues behind the orbital septum. It presents with sudden, painful proptosis (forward displacement of the eyeball) and ophthalmoplegia (paralysis or weakness of eye muscles) due to inflammation and swelling within the confined orbital space. This condition is an ophthalmologic emergency requiring prompt diagnosis and treatment to prevent vision loss and intracranial spread.

Question 113: What is the most appropriate management for a chalazion?

Topical antiviral therapy
Enucleation
Cryotherapy
Warm compresses (Correct answer)

Correct answer: Warm compresses

A chalazion is a chronic, sterile lipogranulomatous inflammation of a meibomian gland, often presenting as a painless lump on the eyelid. The most appropriate initial management involves applying warm compresses multiple times a day. This helps to soften the hardened secretions, promote drainage of the blocked gland, and reduce inflammation, often leading to resolution without further intervention.

Question 114: What is a common complication of chronic uveitis?

Cataract (Correct answer)
Nystagmus
Hyperopia
Presbyopia

Correct answer: Cataract

Chronic uveitis, especially when involving the anterior segment, frequently leads to the development of cataracts. The persistent inflammation itself can contribute to lens opacification, and the long-term use of corticosteroids, a common treatment for uveitis, is also a significant risk factor for cataract formation. These cataracts can significantly impair vision and often require surgical intervention.

Question 115: Orbital rhabdomyosarcoma in children most commonly presents at which age range?

Under 2 years
15-20 years
5-10 years (Correct answer)
10-15 years

Correct answer: 5-10 years

Orbital rhabdomyosarcoma most commonly presents in children between ages 5-10 years (median age 7-8) with rapidly progressive unilateral proptosis.

Question 116: During retinoscopy on an uncorrected myopic eye, the examiner working at a standard distance will observe:

"With" motion when working outside the far point.
No reflex motion.
"Against" motion when working inside the far point.
"Against" motion when working outside the far point. (Correct answer)

Correct answer: "Against" motion when working outside the far point.

The far point of a myopic eye is a real point in space in front of the eye. When the retinoscope is positioned outside this far point (as is typical at a standard working distance), the light reflex will move in the opposite direction to the streak, which is termed "against" motion.

Question 117: A 45-year-old patient with chronic anterior uveitis develops elevated IOP. Which mechanism is most likely responsible for the IOP spike during an active inflammatory episode?

Steroid-induced IOP elevation
Angle neovascularization
Pupillary block from posterior synechiae
Trabeculitis (Correct answer)

Correct answer: Trabeculitis

During active uveitis, inflammatory cells and proteins can clog the trabecular meshwork, a condition known as trabeculitis. This obstruction of the aqueous outflow pathway leads to an increase in intraocular pressure.

American Board of Ophthalmology Written Qualifying Examination (WQE)

The ABO Written Qualifying Examination (WQE) is a 250-question, single-best-answer multiple-choice exam that evaluates the breadth and depth of basic science and clinical knowledge across all ophthalmology subspecialties required for board certification.

Questions

33 min

Time Limit

70%

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