JCAHPO Imaging 2

Question 1

Which OCT imaging feature is most characteristic of a macular hole?

Accepted Answer

Full-thickness retinal defect with elevated edges

Answer

A macular hole appears on OCT as a full-thickness defect through all retinal layers with cuffing (elevated edges) due to fluid accumulation.

Question 2

On fluorescein angiography, a 'blocked fluorescence' pattern is caused by:

Accepted Answer

Preretinal or subretinal material blocking the choroidal signal

Answer

Blocked fluorescence occurs when blood, pigment, or exudate blocks the normal choroidal fluorescence from reaching the camera.

Question 3

Which imaging modality is considered the gold standard for detecting choroidal tumors and their extent?

Accepted Answer

B-scan ultrasonography

Answer

B-scan ultrasonography is the gold standard for evaluating choroidal tumors because it penetrates media opacities and reveals internal tumor structure.

Question 4

In optical coherence tomography angiography (OCTA), flow is detected by:

Accepted Answer

Decorrelation of signal between repeated B-scans

Answer

OCTA detects blood flow by measuring the decorrelation (variation) in OCT signal between sequential B-scans caused by moving erythrocytes.

Question 5

A 'geographic atrophy' pattern on fundus autofluorescence (FAF) appears as:

Accepted Answer

Hypoautofluorescent area corresponding to RPE loss

Answer

Geographic atrophy appears as a sharply demarcated hypoautofluorescent area because absent RPE cells cannot produce lipofuscin fluorescence.

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

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

JCAHPO Imaging 2