Scotoma

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scotoma

[skə′tō·mə]
(medicine)
A blind spot or area of depressed vision in the visual field.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Scotoma

 

a blind area within the visual field, not affecting the surrounding area of the eye. Physiologic scotoma is that area of a healthy eye’s visual field corresponding with the optic disk, which does not have photoreceptors. Pathologic scotoma is a diagnostic symptom of many diseases, including retinitis and atrophy of the optic nerve. It is perceived as a dark spot (positive scotoma) or as a blank spot (negative scotoma) that can be detected only through special testing. During teichopsia (scintillating scotoma), which lasts 20–30 minutes, flickering is perceived along the eye’s periphery; the condition is usually accompanied by persistent headaches, nausea, and vomiting. Treatment of scotoma is directed toward the underlying disease.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
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The characteristics of the scotomas also remained relatively constant in terms of the number of scotomatous borders around the PRL and the location of scotomas relative to the PRL.
In Nilsson et al.'s feasibility study, they trained a retinal locus in a scotomatous eye; each subject's other eye was unimpaired [32].
The person with central fixation in one eye is constrained to putting the fixation cross on the scotomatous retina in the fellow eye under binocular conditions.