AOC AOC Ocular Motility and Strabismus 2 — Questions and Answers
Question 1: Brown syndrome is characterized by limited elevation in which gaze direction?
- Elevation in abduction
- Elevation in adduction (Correct answer)
- Depression in adduction
- Elevation in primary gaze
Correct answer: Elevation in adduction
Brown syndrome (superior oblique tendon sheath syndrome) restricts elevation of the eye in adduction due to tightness of the superior oblique tendon.
Question 2: The prism and alternate cover test measures which component of deviation?
- Manifest (tropia) only
- Latent (phoria) only
- Total deviation (tropia + phoria) (Correct answer)
- Cyclodeviation only
Correct answer: Total deviation (tropia + phoria)
The prism and alternate cover test dissociates fusion to measure the total deviation, including both the manifest and latent components.
Question 3: Duane retraction syndrome most commonly affects which eye movement?
- Elevation
- Abduction (Correct answer)
- Depression
- Incyclotorsion
Correct answer: Abduction
Duane retraction syndrome typically involves limitation of abduction with globe retraction and palpebral fissure narrowing on attempted adduction.
Question 4: Which measurement technique uses the deviation of a light reflex in one eye while the other fixates to estimate angle of deviation in non-cooperative patients?
- Krimsky test (Correct answer)
- 4-diopter base-out test
- Maddox rod test
- Bagolini striated lens test
Correct answer: Krimsky test
The Krimsky test places prisms before the deviating eye to center the corneal light reflex, estimating the angle of strabismus without requiring patient cooperation.
Question 5: In infantile esotropia, the typical angle of deviation at presentation is:
- Less than 10 PD
- 10–20 PD
- Greater than 30 PD (Correct answer)
- 10–15 PD
Correct answer: Greater than 30 PD
Infantile esotropia characteristically presents with a large, constant esotropia typically greater than 30 prism diopters.
Question 6: Which extraocular muscle is responsible for intorsion (incyclotorsion) of the eye?
- Inferior oblique
- Superior rectus
- Superior oblique (Correct answer)
- Medial rectus
Correct answer: Superior oblique
The superior oblique muscle is the primary intortor of the eye, rotating the top of the cornea toward the nose.
AOC AOC Ocular Motility and Strabismus 2
Brown syndrome is characterized by limited elevation in which gaze direction?