AOC AOC Binocular Vision and Strabismus

Question 1

Which term describes a manifest deviation of the eyes that is present without any occlusion?

Accepted Answer

Heterotropia

Answer

A heterotropia is a manifest, constant or intermittent strabismus visible without covering either eye.

Question 2

The Hirschberg test estimates angle of strabismus by observing the position of which structure?

Accepted Answer

Corneal light reflex

Answer

The Hirschberg test uses the position of the corneal light reflex relative to the pupil center to estimate the angle of deviation.

Question 3

In the cover-uncover test, movement of the uncovered eye upon covering the other eye indicates which condition?

Accepted Answer

Tropia

Answer

Movement of the uncovered eye during a cover-uncover test reveals a tropia (manifest strabismus).

Question 4

An esotropia where the angle is larger for near fixation than for distance is called which type?

Accepted Answer

Convergence excess esotropia

Answer

Convergence excess esotropia presents with a significantly larger angle at near compared to distance fixation.

Question 5

Which prism test measures the full magnitude of a strabismic deviation including the motor fusion component?

Accepted Answer

Prism cover test

Answer

The prism cover test dissociates fusion and measures the total deviation, including both manifest and latent components.

(AOC) American Orthoptic Council Practice Test