Ophthalmic Imaging and Photography Flashcards
7 cards from real COT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Ophthalmic Imaging and Photography flashcards as text
A photographer notices the fundus image has a crescent-shaped dark shadow on one edge. The most likely cause is:
Answer: Patient's eyelid partially covering the pupil
A crescent-shaped shadow (eyelid artifact) occurs when the patient's upper or lower eyelid partially occludes the pupil during image capture.
Stereo fundus photography achieves a three-dimensional view by:
Answer: Capturing two images from slightly different angles through the same pupil
Stereo fundus photography captures two sequential images with the camera decentered slightly left and right, simulating binocular parallax for 3D viewing.
In OCT imaging, 'shadow artifact' beneath a retinal vessel is caused by:
Answer: Absorption and scattering of the OCT beam by blood blocking deeper signal
Blood in retinal vessels strongly absorbs and scatters the OCT beam, producing a dark (hyporeflective) shadow beneath the vessel in the scan.
Which imaging modality is considered the gold standard for diagnosing choroidal neovascularization (CNV) location and activity in wet AMD?
Answer: Fluorescein angiography
Fluorescein angiography remains the gold standard for characterizing CNV type (classic vs. occult), boundaries, and activity to guide anti-VEGF treatment decisions.
The Specular microscope measures which property of the corneal endothelium?
Answer: Endothelial cell density and morphology
Specular microscopy analyzes the reflected image of the endothelial cell mosaic to measure cell density (cells/mm²), cell size variation (CV), and hexagonality.
When performing B-scan ultrasonography on a patient with dense vitreous hemorrhage, the primary clinical goal is to:
Answer: Rule out retinal detachment or posterior segment pathology hidden by the hemorrhage
B-scan US penetrates media opacities like dense hemorrhage, allowing the examiner to evaluate retinal attachment and detect posterior pathology when direct visualization is impossible.
The recommended patient position for obtaining a reliable and reproducible Goldmann visual field test during documentation is:
Answer: Upright with chin and forehead resting firmly in the bowl rest
The patient should sit upright with their chin and forehead positioned firmly against the bowl rests to stabilize the head and maintain consistent eye position throughout the test.