Vision and Ophthalmology Diagnostic Testing and Equipment 3

Question 1

Indocyanine green angiography (ICGA) is superior to fluorescein angiography for imaging:

Accepted Answer

Choroidal vasculature

Answer

ICG dye is highly protein-bound and fluoresces in near-infrared wavelengths that penetrate the RPE, making ICGA ideal for imaging choroidal circulation.

Question 2

The gonioscope is used to examine which ocular structure?

Accepted Answer

Anterior chamber angle (trabecular meshwork)

Answer

Gonioscopy uses a mirrored or direct contact lens to visualize the anterior chamber angle structures including the trabecular meshwork, Schwalbe's line, and iris insertion.

Question 3

In automated static perimetry, the mean deviation (MD) parameter represents:

Accepted Answer

The average deviation of all tested points from age-corrected normal values

Answer

Mean deviation (MD) is the average difference between the patient's measured sensitivity and age-matched normal values across all tested points, with more negative values indicating worse loss.

Question 4

Which test is used to detect subtle color vision defects, especially red-green deficiency?

Accepted Answer

Ishihara pseudoisochromatic plates

Answer

Ishihara plates use pseudoisochromatic designs where numbers or patterns visible to normal color vision are camouflaged against confusing backgrounds for red-green color blind individuals.

Question 5

Ultrasound biomicroscopy (UBM) is particularly useful for imaging which structures?

Accepted Answer

Anterior segment structures behind the iris (ciliary body, sulcus)

Answer

UBM uses high-frequency ultrasound (50 MHz) to image anterior segment structures that are hidden from direct view, such as the ciliary body, pars plana, and posterior iris.

Vision and Ophthalmology Practice Test

Vision and Ophthalmology Practice Test

Vision and Ophthalmology Diagnostic Testing and Equipment 3