COT Ocular Motility Testing 3

Question 1

Which cranial nerve innervates the superior oblique muscle?

Accepted Answer

CN IV

Answer

The trochlear nerve (cranial nerve IV) is the sole innervator of the superior oblique muscle.

Question 2

A Krimsky test uses prisms in which of the following ways?

Accepted Answer

Over the fixing eye to center the light reflex in the deviating eye

Answer

The Krimsky test places prism over the fixing eye until the corneal reflex centers in the deviating eye, neutralizing the deviation.

Question 3

When performing versions, which movement is described as both eyes rotating to the right?

Accepted Answer

Dextroversion

Answer

Dextroversion is a conjugate movement of both eyes to the right.

Question 4

Which test is most useful for detecting small vertical deviations and cyclotropia simultaneously?

Accepted Answer

Double Maddox rod test

Answer

The double Maddox rod test is used to quantify cyclodeviation by having the patient align two perceived lines, one seen by each eye.

Question 5

Innervation of the inferior oblique muscle is supplied by which branch of the oculomotor nerve?

Accepted Answer

Inferior division

Answer

The inferior division of CN III innervates the inferior oblique, medial rectus, and inferior rectus muscles.

COT - Certified Ophthalmic Technician Practice Test