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
Electroretinography (ERG) measures the electrical response of which cells in the retina?
Answer: Photoreceptors and bipolar cells (a-wave and b-wave)
The full-field ERG records mass electrical responses: the a-wave primarily reflects photoreceptor function and the b-wave reflects bipolar/Müller cell activity.
The Humphrey visual field analyzer uses which method to test the visual field?
Answer: Static automated perimetry (stationary targets at fixed locations)
The Humphrey Field Analyzer uses static automated perimetry, presenting stationary light stimuli at predetermined locations and varying intensity to determine threshold sensitivity.
Specular microscopy is used to evaluate which ocular structure?
Answer: Corneal endothelium (endothelial cell count and morphology)
Specular microscopy images the corneal endothelium, providing cell count (cells/mm²), cell size (polymegethism), and shape variation (pleomorphism).
Which imaging modality is the gold standard for evaluating the optic nerve fiber layer in glaucoma?
Answer: Optical coherence tomography (OCT)
Spectral-domain OCT provides quantitative measurements of retinal nerve fiber layer (RNFL) thickness, which correlates with ganglion cell loss in glaucoma.
The pupillary light reflex is evaluated clinically using which test for afferent pathway defects?
Answer: Swinging flashlight test (RAPD)
The swinging flashlight test detects a relative afferent pupillary defect (RAPD/Marcus Gunn pupil), indicating unilateral optic nerve or extensive retinal disease.
Pachymetry measures which parameter of the cornea?
Answer: Thickness
Pachymetry measures corneal thickness, which is important for IOP interpretation (thin corneas give falsely low readings) and LASIK candidacy screening.