COT Visual Field Testing 5

Question 1

When performing visual field testing on a patient with significant ptosis, which corrective measure should the technician take?

Accepted Answer

Tape the upper eyelid to prevent artifact from lid droop

Answer

Taping the upper eyelid prevents ptosis from obscuring the superior visual field and causing a false superior arcuate artifact during testing.

Question 2

Which of the following represents a macular threat when monitoring glaucoma patients with the Humphrey 24-2 program?

Accepted Answer

Central scotoma encroaching within 5° of fixation

Answer

When field defects approach within 5° of fixation, the 10-2 program should be added to monitor central field more precisely, as macular threat risks reading and driving vision.

Question 3

The Amsler grid primarily tests the central:

Accepted Answer

10 degrees of visual field

Answer

The standard Amsler grid tests the central 10° radius (20° total) of the visual field and is used to detect metamorphopsia and central/paracentral scotomas.

Question 4

A patient with advanced glaucoma completes a Humphrey 24-2 test showing only a small central island of remaining vision. Which additional test program is recommended to monitor this residual central field?

Accepted Answer

10-2

Answer

The 10-2 program's denser 2° test grid within the central 10° provides better monitoring of the remaining central visual island in advanced glaucoma.

Question 5

What is the purpose of the foveal threshold measurement reported on a Humphrey Visual Field test?

Accepted Answer

It provides a measure of central macular sensitivity that supplements the field test

Answer

The foveal threshold test measures the sensitivity at the very center of fixation (fovea), providing an additional data point about central macular function independent of the main field test.

COT - Certified Ophthalmic Technician Practice Test

COT - Certified Ophthalmic Technician Practice Test

COT Visual Field Testing 5