COT Visual Field Testing 4

Question 1

The 10-2 visual field test pattern is specifically designed to test points within what degree of fixation?

Accepted Answer

10 degrees

Answer

The 10-2 program tests a 10° × 10° grid centered on fixation with points spaced 2° apart, making it ideal for monitoring central field in conditions like macular degeneration or advanced glaucoma.

Question 2

Which of the following best describes the physiologic blind spot on a visual field test?

Accepted Answer

An absolute scotoma approximately 15° temporal to fixation corresponding to the optic disc

Answer

The physiologic blind spot is an absolute scotoma located approximately 15° temporal to fixation where the optic disc has no photoreceptors.

Question 3

A patient shows a superior altitudinal visual field defect. The most likely cause is:

Accepted Answer

Inferior branch retinal artery occlusion or inferior optic nerve damage

Answer

Superior altitudinal defects (loss of the upper field) result from damage to inferior retinal structures or the inferior optic nerve, often from inferior BRAO or inferior AION.

Question 4

During automated perimetry, fixation losses are detected by periodically presenting stimuli at the:

Accepted Answer

Blind spot location

Answer

The Heijl-Krakau method projects stimuli into the patient's mapped blind spot; if the patient responds, it indicates they are not maintaining proper fixation.

Question 5

What is the clinical significance of the Pattern Standard Deviation (PSD) on a Humphrey Field Analyzer printout?

Accepted Answer

It quantifies the irregularity or focal nature of the field loss

Answer

PSD measures the variability of individual test point deviations from the age-corrected average, with elevated PSD indicating focal or localized loss characteristic of glaucoma.

COT - Certified Ophthalmic Technician Practice Test

COT - Certified Ophthalmic Technician Practice Test

COT Visual Field Testing 4