AOC Clinical Procedures and Protocols 2

Question 1

During the cover-uncover test, the examiner observes the uncovered eye to detect which type of deviation?

Accepted Answer

Heterotropia

Answer

The cover-uncover test reveals heterotropia (manifest strabismus) by observing movement of the uncovered eye when the fellow eye is covered.

Question 2

What is the primary purpose of performing the alternate cover test (ACT)?

Accepted Answer

Detect total deviation including phoria and tropia

Answer

The alternate cover test dissociates fusion and reveals the total deviation, which includes both the phoric and tropic components.

Question 3

When using prism bars to measure a strabismic deviation, the prism is placed before which eye?

Accepted Answer

Either eye, as results are equivalent by Prentice's rule

Answer

By the principle of equivalence (Prentice's rule), placing prisms before either eye yields the same measurement of the deviation.

Question 4

A patient with a left esotropia of 30 PD is being measured with prism and alternate cover test. Where is the apex of the neutralizing prism directed?

Accepted Answer

Temporally (base in)

Answer

To neutralize an esotropia, a base-in prism (apex temporal) is used, as the eye is deviated inward and the prism must redirect the visual axis.

Question 5

The Hirschberg test estimates the angle of strabismus based on the position of which clinical finding?

Accepted Answer

The 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.

(AOC) American Orthoptic Council Practice Test