Diagnostic Testing and Equipment Flashcards
6 cards from real Vision and Ophthalmology practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Diagnostic Testing and Equipment flashcards as text
Indocyanine green angiography (ICGA) is superior to fluorescein angiography for imaging:
Answer: Choroidal vasculature
ICG dye is highly protein-bound and fluoresces in near-infrared wavelengths that penetrate the RPE, making ICGA ideal for imaging choroidal circulation.
The gonioscope is used to examine which ocular structure?
Answer: Anterior chamber angle (trabecular meshwork)
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.
In automated static perimetry, the mean deviation (MD) parameter represents:
Answer: The average deviation of all tested points from age-corrected normal values
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.
Which test is used to detect subtle color vision defects, especially red-green deficiency?
Answer: Ishihara pseudoisochromatic plates
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.
Ultrasound biomicroscopy (UBM) is particularly useful for imaging which structures?
Answer: Anterior segment structures behind the iris (ciliary body, sulcus)
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.
The Amsler grid primarily tests which area of the visual field?
Answer: Central 10–20 degrees (macular function)
The Amsler grid tests the central 10–20 degrees of vision, allowing patients to detect metamorphopsia or scotomas caused by macular disease.