CPOA Diagnostic Testing 3

Question 1

Which test specifically evaluates a patient's sensitivity to contrast rather than high-contrast letter acuity?

Accepted Answer

Contrast sensitivity testing (e.g., Pelli-Robson chart)

Answer

Contrast sensitivity testing, such as with the Pelli-Robson chart, evaluates how well patients detect differences in luminance, which can reveal visual deficits not shown on Snellen testing.

Question 2

The Amsler grid is used primarily to detect abnormalities in which area of the visual field?

Accepted Answer

Central 20 degrees (macular area)

Answer

The Amsler grid tests the central 20 degrees of vision and is commonly used to detect metamorphopsia or scotomas from macular disease.

Question 3

During a slit lamp examination, the technique used to view the anterior chamber angle structures is called:

Accepted Answer

Gonioscopy

Answer

Gonioscopy uses a special contact lens to redirect light and allow direct visualization of the trabecular meshwork and anterior chamber angle.

Question 4

A patient has a B-scan ultrasound ordered. This test is most useful when:

Accepted Answer

The ocular media is opaque and the posterior segment cannot be directly viewed

Answer

B-scan ultrasonography creates a cross-sectional image of the eye and is especially valuable when a dense cataract or vitreous hemorrhage prevents direct posterior segment examination.

Question 5

The Hirschberg light reflex test is used to estimate:

Accepted Answer

The magnitude of a strabismic deviation

Answer

The Hirschberg test estimates ocular alignment by noting the position of a penlight corneal reflex; each 1 mm of decentration equals approximately 15 prism diopters of deviation.

(CPOA) Certified Paraoptometric Assistant Practice Test

(CPOA) Certified Paraoptometric Assistant Practice Test

CPOA Diagnostic Testing 3