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 It might be outdated or ideologically biased.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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Table 1: Age and sex Distribution n % Age (Years) 26-30 15 31.25 31-35 19 39.58 36-40 9 18.75 41-45 4 8.33 46-50 1 2.08 >50 0 0.00 Mean [+ or -] SD 35 [+ or -] 7.1 Gender Male 40 83.34 Female 8 16.66 Table 2: Clinical Features n % Laterality Unilateral 48 100.00 Bilateral 0 0.00 Right eye 23 47.91 Left eye 25 52.08 Presenting Complaint Blurring of vision 21 43.75 Metamorphopsia 15 31.25 Relative scotoma 9 18.75 Micropsia 3 6.25 Table 3: Visual Acuity on Presentation Visual Acuity n % 6/6P 4 8.33 6/9 - 6/9P 9 18.75 6/12 - 6/12P 13 27.08 6/18 - 6/18P 12 25.00 6/24 - 6/24P 0 0.00 6/36 - 6/36P 7 14.58 6/60 3 6.25 < 6/60 0 0.00 Table 4: Fundus Fluorescein Angiography No.
(1,2) Before central visual acuity is deteriorated, patients with macular edema may suffer from some disturbances of visual function such as metamorphopsia, blurring, relative scotoma, loss of fixation and decrease of contrast sensitivity, which are not assessed and quantified in routine examination.
The patient will present with a sudden onset of unilateral blurred vision in association with a positive relative scotoma, micropsia or metamorphopsia.