CPOA Diagnostic Testing 5

Question 1

When assessing stereopsis with the Randot or Titmus test, the patient must wear polarized glasses because:

Accepted Answer

Each eye must see a slightly different image to simulate depth perception

Answer

Polarized filters present slightly disparate images to each eye simultaneously, creating the retinal disparity needed to measure stereoscopic depth perception.

Question 2

The potential acuity meter (PAM) is used preoperatively to predict visual outcomes after cataract surgery by:

Accepted Answer

Projecting a Snellen chart through a pinpoint of light directly onto the retina bypassing the cataract

Answer

The PAM projects a miniaturized acuity chart through an intact portion of the optical media onto the retina, allowing estimation of macular function independent of lens opacity.

Question 3

In a 24-2 visual field test, the '24' refers to:

Accepted Answer

The test extends 24 degrees from fixation

Answer

The 24-2 pattern tests points within 24 degrees of fixation (plus two points beyond), making it sufficient to detect most glaucomatous defects while being faster than the 30-2 pattern.

Question 4

During keratometry, the 'mires' that the technician aligns are reflections of:

Accepted Answer

The illuminated rings or targets reflected off the anterior corneal surface

Answer

A keratometer measures the radius of curvature of the anterior cornea by analyzing the size and separation of illuminated mire reflections from the corneal surface.

Question 5

A patient undergoing visual evoked potential (VEP) testing has electrodes placed on their scalp to measure:

Accepted Answer

Electrical responses in the visual cortex in response to visual stimuli

Answer

VEP records cortical electrical activity from the occipital lobe in response to visual stimuli, helping evaluate the integrity of the visual pathway from retina to cortex.

(CPOA) Certified Paraoptometric Assistant Practice Test

(CPOA) Certified Paraoptometric Assistant Practice Test

CPOA Diagnostic Testing 5