COT Ocular Motility Testing 2

Question 1

During the alternate cover test, the examiner notes that the uncovered eye moves inward when the cover is removed. This finding indicates:

Accepted Answer

Exophoria

Answer

When the uncovered eye moves inward (nasally), it was deviated outward under the cover, indicating exophoria.

Question 2

The Hirschberg corneal light reflex test estimates approximately how many prism diopters of deviation per millimeter of decentration?

Accepted Answer

22 PD per mm

Answer

The Hirschberg test estimates approximately 22 prism diopters of deviation per millimeter the light reflex is decentered from the corneal center.

Question 3

Which muscle is the primary abductor of the eye?

Accepted Answer

Lateral rectus

Answer

The lateral rectus muscle is the primary abductor, moving the eye outward (temporally).

Question 4

A patient with a left superior oblique palsy would show the greatest vertical deviation in which gaze position?

Accepted Answer

Right gaze and depression

Answer

The left superior oblique is most active in depression and adduction (right gaze for a left eye), so the deviation is greatest in right gaze and depression.

Question 5

The Maddox rod test is primarily used to detect:

Accepted Answer

Heterophoria

Answer

The Maddox rod dissociates the two eyes to reveal a latent deviation (heterophoria) that is normally controlled by fusion.

COT - Certified Ophthalmic Technician Practice Test

COT - Certified Ophthalmic Technician Practice Test

COT Ocular Motility Testing 2