American Orthoptic Council (AOC) Certification Examination — Questions and Answers

Question 1: Which instrument is used in orthoptics to measure and treat strabismus by presenting different images to each eye simultaneously?

Fundus camera
Synoptophore (major amblyoscope) (Correct answer)
Slit lamp
Perimeter

Correct answer: Synoptophore (major amblyoscope)

The synoptophore (major amblyoscope) projects separate targets to each eye, allowing measurement of strabismus angles and assessment of binocular vision.

Question 2: Rose bengal dye is used in ophthalmic practice to stain which specific tissue type?

Corneal stroma
Healthy corneal epithelium
Conjunctival vessels
Dead or devitalized epithelial cells and mucus (Correct answer)

Correct answer: Dead or devitalized epithelial cells and mucus

Rose bengal stains dead and devitalized epithelial cells and mucus strands, making it useful for evaluating dry eye disease and herpetic dendrites.

Question 3: When a Certified Orthoptist identifies a finding that suggests a systemic neurological condition, what is the appropriate action?

Treat the condition independently
Dismiss the finding as outside orthoptic scope
Document and immediately communicate findings to the supervising ophthalmologist (Correct answer)
Refer the patient to a neurologist without notifying the ophthalmologist

Correct answer: Document and immediately communicate findings to the supervising ophthalmologist

COs must communicate unexpected or significant findings to the supervising ophthalmologist who is responsible for medical management.

Question 4: In the Hess screen test, a contracted field pattern on the affected side indicates which finding?

Normal ocular motility bilaterally
Bilateral symmetric palsy
Overacting muscle ipsilateral to the small field
Underacting muscle ipsilateral to the small field (Correct answer)

Correct answer: Underacting muscle ipsilateral to the small field

A small (contracted) field on the Hess screen indicates underaction of the muscles on that side, corresponding to a paresis or restriction.

Question 5: When a patient experiences anaphylaxis after topical eye drop administration, what is the first-line emergency medication?

Inhaled albuterol
Oral diphenhydramine
Intravenous corticosteroids
Intramuscular epinephrine (Correct answer)

Correct answer: Intramuscular epinephrine

Intramuscular epinephrine (typically to the lateral thigh) is the first-line treatment for anaphylaxis and must be administered before antihistamines or steroids.

Question 6: Torsional diplopia is a key complaint associated with which type of strabismus?

Intermittent exotropia
Superior oblique palsy (Correct answer)
Accommodative esotropia
Duane syndrome type I

Correct answer: Superior oblique palsy

Superior oblique palsy causes excyclotorsion of the affected eye, producing subjective torsional (tilted) diplopia that patients may describe as one image appearing rotated.

Question 7: When using a red lens dissociation test in a patient with diplopia, the red image is seen to the patient's right. This indicates the right image is from which eye?

The right eye, indicating crossed diplopia
The right eye, indicating uncrossed diplopia
The left eye, indicating crossed diplopia
The left eye, indicating uncrossed diplopia (Correct answer)

Correct answer: The left eye, indicating uncrossed diplopia

With a red lens over the right eye, a red image perceived on the patient's right indicates the image originates from the right eye, constituting uncrossed (homonymous) diplopia.

Question 8: Which statement best reflects current evidence regarding amblyopia treatment initiated beyond the traditional critical period?

Only surgical interventions can improve acuity after the critical period has closed
Treatment efficacy in adults is equivalent to that in children under 7 years old
Meaningful improvement is still possible, though outcomes are generally more limited than in younger children (Correct answer)
Treatment is entirely ineffective once a patient reaches 9 years of age

Correct answer: Meaningful improvement is still possible, though outcomes are generally more limited than in younger children

Extended PEDIG trials and subsequent research have demonstrated that amblyopia treatment can yield clinically meaningful acuity improvements in older children and even adults, although the magnitude and speed of response are typically less than in younger patients.

Question 9: In amblyopia evaluation, the neutral density filter (NDF) test primarily helps differentiate:

Central fixation from eccentric fixation
Deprivation amblyopia from refractive amblyopia
Organic (structural) vision loss from functional amblyopia (Correct answer)
Strabismic amblyopia from anisometropic amblyopia

Correct answer: Organic (structural) vision loss from functional amblyopia

Adding a neutral density filter reduces acuity proportionally in organic pathology but has little additional effect on functional amblyopia, allowing the examiner to distinguish the two conditions.

Question 10: A patient is prescribed prednisolone acetate 1% for anterior uveitis. Which long-term risk must be monitored with ongoing topical corticosteroid use?

Retinal detachment
Corneal neovascularization
Optic neuritis
Posterior subcapsular cataract and steroid-induced glaucoma (Correct answer)

Correct answer: Posterior subcapsular cataract and steroid-induced glaucoma

Long-term topical corticosteroid use can cause posterior subcapsular cataracts and raise IOP (steroid-response glaucoma), requiring regular monitoring.

Question 11: During an orthoptic evaluation for accommodative esotropia, which test best determines the AC/A ratio?

Red glass test
Bagolini striated lens test
Gradient method using lenses (Correct answer)
Synoptophore test

Correct answer: Gradient method using lenses

The gradient method measures deviation at distance with and without added lenses to calculate the accommodative convergence to accommodation ratio.

Question 12: When performing visual acuity testing in young children unable to read letters, which test is most commonly used?

Lea symbols or Teller acuity cards (Correct answer)
LogMAR chart
Snellen chart
Color plate testing

Correct answer: Lea symbols or Teller acuity cards

Lea symbols and Teller acuity cards are developmentally appropriate tools for assessing visual acuity in preverbal or young children.

Question 13: Which cycloplegic agent has the longest duration of action and is used primarily for therapeutic cycloplegia in amblyopia treatment?

Cyclopentolate
Atropine (Correct answer)
Tropicamide
Phenylephrine

Correct answer: Atropine

Atropine has the longest duration (up to 2 weeks) among cycloplegics and is used in penalization therapy for amblyopia by blurring the fellow eye.

Question 14: Under AOC guidelines, which task is NOT within the scope of practice for an orthoptist?

Assessing eye movement abnormalities
Conducting vision therapy exercises
Measuring and testing binocular vision
Performing comprehensive eye surgeries (Correct answer)

Correct answer: Performing comprehensive eye surgeries

Under AOC guidelines, performing comprehensive eye surgeries is NOT within the scope of practice for an orthoptist. Orthoptists are highly trained in the non-surgical diagnosis and management of binocular vision disorders, utilizing methods like vision therapy and specialized diagnostic tests. Surgical procedures are exclusively performed by ophthalmologists, who are medical doctors specializing in eye surgery.

Question 15: Pinhole testing improves visual acuity primarily in patients with which condition?

Cataracts (dense)
Optic nerve disease
Refractive error (Correct answer)
Macular degeneration

Correct answer: Refractive error

A pinhole reduces the blur circle caused by refractive error; improvement with pinhole testing suggests the vision loss is primarily refractive in nature.

Question 16: The Snellen chart tests which aspect of visual function?

Color vision
Visual field
Distance visual acuity (Correct answer)
Contrast sensitivity

Correct answer: Distance visual acuity

The Snellen chart is the standard tool for measuring distance visual acuity, expressed as a fraction (e.g., 20/20).

Question 17: Which of the following tests would a Certified Orthoptist be expected to perform as part of a standard sensorimotor evaluation?

Corneal topography
Laser refractive measurement
Fundus fluorescein angiography
Stereoacuity testing with the Randot or TNO stereotest (Correct answer)

Correct answer: Stereoacuity testing with the Randot or TNO stereotest

Stereoacuity testing is a core orthoptic evaluation tool used to assess binocular vision function.

Question 18: Which test is commonly used in orthoptic practice to quantify stereoacuity at near?

Maddox rod test
Bagolini striated lens test
Titmus fly stereotest (Correct answer)
Worth 4-dot test

Correct answer: Titmus fly stereotest

The Titmus fly stereotest (Wirt circles) is a widely used polarized stereoacuity test that quantifies near stereopsis from 3,000 to 40 seconds of arc.

Question 19: PEDIG research found that patching combined with near visual activities outperformed patching alone primarily because:

Combining near activities with patching reduces the risk of reverse amblyopia
Active near tasks require sustained foveal engagement of the amblyopic eye, enhancing the treatment effect (Correct answer)
Near activities activate entirely different cortical regions not stimulated by distance patching
Near activities prevent children from removing the patch during school hours

Correct answer: Active near tasks require sustained foveal engagement of the amblyopic eye, enhancing the treatment effect

PEDIG studies showed that engaging in near visual tasks (reading, coloring, video games) during prescribed patching hours requires active foveal use of the amblyopic eye, amplifying the therapeutic benefit beyond passive occlusion alone.

Question 20: How does atropine penalization of the fellow eye treat amblyopia in a hyperopic child?

It relaxes the ciliary muscle of the amblyopic eye to sharpen its retinal image
It dilates the pupil of the amblyopic eye to increase retinal illumination
It directly stimulates visual cortex cells corresponding to the amblyopic eye
It paralyzes accommodation in the fellow eye, blurring near vision and forcing use of the amblyopic eye (Correct answer)

Correct answer: It paralyzes accommodation in the fellow eye, blurring near vision and forcing use of the amblyopic eye

Atropine instilled in the better-seeing eye inhibits accommodation, blurring near vision in that eye and compelling the child to rely on the amblyopic eye for near visual tasks, thereby stimulating its development.

Question 21: During an initial assessment, what should be documented first?

Family social history only
Insurance information
Discharge planning notes
Chief complaint and history of present illness (Correct answer)

Correct answer: Chief complaint and history of present illness

The chief complaint and history of present illness establish the reason for the visit and provide context for the examination.

Question 22: What does "PRN" mean in medication orders?

As needed (pro re nata) (Correct answer)
Patient requires notification
Pre-registered narcotics
Prescription renewal notice

Correct answer: As needed (pro re nata)

PRN (pro re nata) means medication is given as needed based on patient symptoms rather than on a fixed schedule.

Question 23: The Bielschowsky head tilt test is used to differentiate superior oblique palsy from which other condition?

Inferior rectus paresis
Sixth nerve palsy
Convergence insufficiency
Skew deviation (Correct answer)

Correct answer: Skew deviation

The Bielschowsky head tilt test helps distinguish superior oblique palsy (showing hypertropia that worsens on ipsilateral head tilt) from a skew deviation.

Question 24: Which continuing education requirement must COs fulfill to maintain AOC certification?

Complete 50 hours of continuing education annually
No continuing education is required after initial certification
Pass a written re-examination every 5 years
Complete 20 hours of continuing education every 2 years (Correct answer)

Correct answer: Complete 20 hours of continuing education every 2 years

AOC requires Certified Orthoptists to complete 20 continuing education hours per 2-year renewal cycle to maintain certification.

Question 25: Optical coherence tomography (OCT) in the context of neuro-ophthalmic care is most useful for assessing which structure?

Retinal nerve fiber layer thickness and optic disc (Correct answer)
Crystalline lens density
Corneal topography
Tear film stability

Correct answer: Retinal nerve fiber layer thickness and optic disc

OCT measures retinal nerve fiber layer (RNFL) thickness and optic disc morphology, aiding in the diagnosis of glaucoma and optic neuropathies.

Question 26: An orthoptist practicing in a clinical setting discovers a billing discrepancy that appears to involve fraud. According to professional standards, they should:

Continue practice without reporting
Report it through appropriate institutional and regulatory channels (Correct answer)
Ignore it as a billing department issue
Correct the billing records independently

Correct answer: Report it through appropriate institutional and regulatory channels

AOC ethical standards obligate COs to report suspected fraud or unethical conduct through proper channels to protect patients and professional integrity.

Question 27: The Jackson cross cylinder is used during subjective refraction to refine which components of a prescription?

Add power only
Pupillary distance
Sphere and prism
Cylinder power and axis (Correct answer)

Correct answer: Cylinder power and axis

The Jackson cross cylinder (JCC) is a ±0.25 or ±0.50 D crossed cylinder used to refine both the cylinder power and axis during subjective refraction.

Question 28: Visual field testing is performed in the orthoptic setting most commonly using which method to map peripheral function?

Confrontation field testing or automated perimetry (Correct answer)
OCT imaging
Fundoscopy
Electroretinography

Correct answer: Confrontation field testing or automated perimetry

Confrontation field testing and automated perimetry (e.g., Humphrey) are standard methods to map the peripheral and central visual fields.

Question 29: Which of the following assessment tools is commonly used to evaluate trainee competency during orthoptic training?

Standardized patient encounter with structured evaluation rubric (Correct answer)
Self-assessment questionnaire without faculty review
Random selection from a question bank
Ungraded peer observation only

Correct answer: Standardized patient encounter with structured evaluation rubric

Structured evaluation rubrics during standardized patient encounters provide objective, reproducible assessment of trainee clinical competency.

Question 30: Which type of lens is used to correct myopia (nearsightedness)?

Prism lens
Minus (concave) lens (Correct answer)
Plus (convex) lens
Plano lens

Correct answer: Minus (concave) lens

Myopia is corrected with minus (concave) lenses, which diverge light and shift the focal point back onto the retina.

Question 31: The Worth 4-dot test is used to assess:

Extraocular motility range
Accommodative amplitude
Binocular fusion status and suppression (Correct answer)
Refractive error magnitude

Correct answer: Binocular fusion status and suppression

The Worth 4-dot test uses red-green glasses and a 4-dot target to evaluate binocular fusion, suppression, and diplopia at distance and near.

American Orthoptic Council (AOC) Certification Examination

The AOC written board exam certifies orthoptists (C.O.) by testing knowledge of binocular vision disorders, strabismus, amblyopia, ocular anatomy, optics, and diagnostic instrumentation. It is taken electronically at a Pearson VUE Testing Center and must be passed before the oral and practical components.

Questions

35 min

Time Limit

70%

To Pass

Checking for saved progress...

Exam Rules

You can skip questions and return to them later
Flag questions for review before submitting
No feedback shown until you submit the entire exam
Unanswered questions count as wrong — answer everything
10 pretest questions are mixed in and don't affect your score
Timer auto-submits when time runs out
Your progress is auto-saved every 30 seconds