AOA Vision Therapy and Rehabilitation 2 — Questions and Answers
Question 1: Low vision rehabilitation is indicated when a patient's best-corrected visual acuity is:
- 20/70 or worse in the better eye with reduced functional ability (Correct answer)
- 20/40 in both eyes with night blindness
- 20/20 with significant contrast sensitivity loss only
- 20/200 or worse in the worse eye only
Correct answer: 20/70 or worse in the better eye with reduced functional ability
Low vision rehabilitation is appropriate for patients with best-corrected VA of 20/70 or worse that limits daily functioning and cannot be further improved by optical correction or treatment.
Question 2: Vergence therapy typically uses which primary instrument to improve fusional vergence ranges?
- Prism bar or Brock string (Correct answer)
- Trial lens set
- Corneal topographer
- Worth 4-dot test
Correct answer: Prism bar or Brock string
Prism bars and the Brock string are foundational tools for training vergence demand and improving the amplitude and facility of fusional vergence responses.
Question 3: Binasal occlusion in prism glasses is used to treat which binocular vision condition?
- Exophoria with convergence insufficiency (Correct answer)
- Esophoria with high AC/A ratio
- Alternating exotropia
- Accommodative esotropia
Correct answer: Exophoria with convergence insufficiency
Binasal occlusion reduces peripheral fusion disruption and enhances accommodative convergence in patients with exophoric tendencies and convergence insufficiency.
Question 4: The critical period for amblyopia treatment is generally considered to close around:
- 7–9 years of age (Correct answer)
- 2–3 years of age
- 12–14 years of age
- 18 years of age
Correct answer: 7–9 years of age
The visual cortex retains neuroplasticity for amblyopia treatment most effectively up to age 7–9, though some response is possible into adolescence with intensive treatment.
Question 5: Eccentric viewing training in low vision rehabilitation teaches a patient to:
- Use a preferred retinal locus outside the damaged macula (Correct answer)
- Increase fixation stability in the fovea
- Expand the peripheral visual field artificially
- Improve contrast sensitivity with optical aids
Correct answer: Use a preferred retinal locus outside the damaged macula
Eccentric viewing trains patients with central scotomas to consistently fixate using a healthy para-central preferred retinal locus (PRL) to maximize functional vision.
Question 6: Which test specifically measures stereoacuity and is commonly used in vision therapy assessment?
- Randot stereotest (Correct answer)
- Cover-uncover test
- Maddox rod test
- Hirschberg corneal reflex test
Correct answer: Randot stereotest
The Randot stereotest uses polarized vectographic targets to measure global and local stereopsis in arc seconds, quantifying binocular depth perception.
AOA Vision Therapy and Rehabilitation 2
Low vision rehabilitation is indicated when a patient's best-corrected visual acuity is: