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Stack #4447569

QuestionAnswer
Q: Define scotoma. A: An area of partial or complete blindness within an otherwise normal visual field.
Q: What is the difference between absolute and relative scotomas? A: In an absolute scotoma, the area is completely blind regardless of light intensity; in a relative scotoma, the patient may detect a brighter stimulus.
Q: Approximately how wide is the total visual field? A: Around 200 degrees.
Q: What is the typical binocular field of view? A: Approximately 120 degrees.
Q: What is Traquair’s "Island of Vision"? A: A conceptual model where the central visual field is seen as an "island" of high sensitivity surrounded by a periphery of lower visual sensitivity.
Q: Which part of the retina provides the best visual acuity? A: The fovea, located in the central retina.
Q: Why does the blind spot occur in the visual field? A: Because there are no photoreceptors in the area of the optic disc (optic nerve head).
Q: Which glasses should a patient wear during a visual field test? A: Usually their reading glasses are used, calculated as the distance prescription plus half the cylinder (mean sphere).
Q: What is considered the gold standard for visual field testing in glaucoma? A: The Humphrey 24-2 full threshold test.
Q: What are two common visual field analyzers? A: The Humphrey Visual Field Analyzer and the Henson Visual Field Analyzer.
Created by: mariamthn
 

 



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