CO CO Pediatric Vision Development & Screening 1 — Questions and Answers
Question 1: The critical period for visual development, during which amblyopia can be most easily induced or treated, extends approximately until what age?
- 2 years
- 5–7 years (Correct answer)
- 10–12 years
- 18 years
Correct answer: 5–7 years
The critical period for visual development typically extends to approximately 7–8 years, though some plasticity persists into the early teens.
Question 2: Which visual acuity testing method is most appropriate for a pre-verbal infant at 6 months of age?
- Snellen chart
- HOTV matching
- Preferential looking (Teller Acuity Cards) (Correct answer)
- Lea symbols chart
Correct answer: Preferential looking (Teller Acuity Cards)
Preferential looking techniques such as Teller Acuity Cards use an infant's natural preference for patterned stimuli to estimate grating visual acuity.
Question 3: Refractive amblyopia due to high bilateral hyperopia typically leads to which type of amblyopia?
- Anisometropic amblyopia
- Ametropic amblyopia (Correct answer)
- Strabismic amblyopia
- Deprivation amblyopia
Correct answer: Ametropic amblyopia
Bilateral high hyperopia causes ametropic amblyopia, where both eyes receive chronically blurred images due to uncorrected refractive error without strabismus.
Question 4: Occlusion therapy (patching) for amblyopia in a child is MOST effective when applied to which eye?
- The amblyopic eye
- The fellow (non-amblyopic) eye (Correct answer)
- Alternating eyes daily
- Both eyes simultaneously
Correct answer: The fellow (non-amblyopic) eye
Patching the fellow (better-seeing) eye forces use of the amblyopic eye, stimulating visual cortex development and improving acuity in that eye.
Question 5: A child presents with a white pupillary reflex (leukocoria). Which condition is MOST important to rule out immediately?
- Convergence insufficiency
- Retinoblastoma (Correct answer)
- Accommodative esotropia
- Duane syndrome
Correct answer: Retinoblastoma
Leukocoria is a red flag sign that must prompt urgent evaluation to exclude retinoblastoma, a life-threatening intraocular malignancy in children.
Question 6: Photo-screening instruments used in pediatric vision screening primarily detect amblyopia risk factors by analyzing which parameter?
- Visual acuity letter recognition
- Corneal light reflex symmetry and retinal reflexes (Correct answer)
- Stereoacuity thresholds
- Saccadic eye movement latency
Correct answer: Corneal light reflex symmetry and retinal reflexes
Photo-screeners analyze corneal light reflexes and the nature of the retinal (red) reflex to detect strabismus, significant refractive error, and media opacities.
CO CO Pediatric Vision Development & Screening 1
The critical period for visual development, during which amblyopia can be most easily induced or treated, extends approximately until what age?