COT Ocular Motility Testing 4

Question 1

In Duane retraction syndrome type I, which movement is primarily limited?

Accepted Answer

Abduction

Answer

Duane type I is characterized by limited or absent abduction due to misfiring of the lateral rectus by the oculomotor nerve.

Question 2

When measuring a horizontal deviation with prisms, base direction for an esotropia should be:

Accepted Answer

Base-out before the deviating eye

Answer

For esotropia (eye turned in), base-out prism is placed before the deviating eye to neutralize the inward deviation.

Question 3

A patient reports that diplopia is worst when looking down and to the right, and has a positive head-tilt test to the right shoulder. Which muscle is most likely affected?

Accepted Answer

Left superior oblique

Answer

Worst diplopia in right infraduction plus worsening on right head tilt implicates the left superior oblique by the Parks three-step test logic.

Question 4

The Worth 4-dot test is performed with red and green filters to assess:

Accepted Answer

Suppression and diplopia

Answer

The Worth 4-dot test uses red/green dissociation to detect suppression, diplopia, or fusion by asking the patient how many dots they see.

Question 5

Convergence insufficiency is best characterized by:

Accepted Answer

Exophoria greater at near than at distance with remote near point of convergence

Answer

Convergence insufficiency presents with exophoria that is greater at near, a receded near point of convergence, and often reduced positive fusional vergence at near.

COT - Certified Ophthalmic Technician Practice Test

COT - Certified Ophthalmic Technician Practice Test

COT Ocular Motility Testing 4