JCAHPO Imaging 3

Question 1

Indocyanine green angiography (ICGA) is preferred over fluorescein angiography for evaluating:

Accepted Answer

Choroidal vasculature and polypoidal choroidal vasculopathy

Answer

ICG dye is lipophilic and protein-bound, allowing better penetration of the RPE to visualize choroidal circulation and polypoidal structures.

Question 2

On a Humphrey visual field test, a 'nerve fiber bundle defect' is characterized by:

Accepted Answer

Arcuate scotoma following the course of nerve fibers

Answer

Nerve fiber bundle defects follow the arcuate pattern of retinal nerve fibers as they course around the macula to the optic nerve.

Question 3

The purpose of the internal fixation target in a slit-lamp-based OCT is to:

Accepted Answer

Stabilize the patient's gaze on the area of interest

Answer

The internal fixation target helps the patient maintain stable gaze on the desired retinal location to ensure consistent and reproducible scans.

Question 4

What does RNFL thickness measured by OCT represent?

Accepted Answer

The thickness of the retinal nerve fiber layer containing ganglion cell axons

Answer

RNFL thickness on OCT measures the innermost retinal layer containing ganglion cell axons; thinning indicates glaucomatous or other optic nerve damage.

Question 5

A patient has a B-scan ultrasound showing high internal reflectivity within a choroidal lesion. This pattern is most consistent with:

Accepted Answer

Choroidal hemangioma

Answer

Choroidal hemangiomas classically show high internal reflectivity on B-scan due to their vascular and fibrous structure, unlike melanomas which are typically low reflective.

(JCAHPO) International Joint Commission Allied Health Personnel in Ophthalmology Practice Test

(JCAHPO) International Joint Commission Allied Health Personnel in Ophthalmology Practice Test

JCAHPO Imaging 3