Scotoma


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scotoma

[skə′tō·mə]
(medicine)
A blind spot or area of depressed vision in the visual field.

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.

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In the second experiment, we recruited subjects whose naturally occurring PRL was to the left of their scotoma and trained them to develop a TRL that was below their scotoma.
With increasing distance from the fovea, the resulting scotomas are usually asymptomatic.
Some of the complications encountered were worsening of macular edema, retinal hemorrhages, scotoma and vitreous contraction.
When we administered the questionnaire, it soon became apparent that the original scoring instructions (the sum of all items) would not result in data that would be analyzable in a meaningful way, since few persons indicated distortions or scotomas or both.
These areas corresponded to the areas of visual scotoma experienced by the patients.
The highest initial IOP was observed in patients with arcuate scotoma and the lowest in patients with preperimetric glaucoma (p = 0.0120; arcuate versus preperimetric: p = 0.0276).
Arcuate, altitudinal, or central visual field permanent scotomas indicative of papillary involvement had persisted in our patient after treatment.
The Amsler grid test can detect scotomas in patients with dengue related maculopathy.
(b) A visual field test on admission identified a central scotoma in the right eye and quadrantanopia in the left (L) eye.
Visual field tests were divided into six categories: no abnormality, decreased retinal sensitivity, paracentral scotoma, concentrically narrowed visual field, arch scotoma, and quadrant irregularities.
He had a central scotoma in the right eye, with initially preserved peripheral vision that rapidly deteriorated; fundoscopy was highly suggestive of panuveitis, with fine keratic granulomatous precipitates, aqueous cells, flare grade 1, and choroidal and subretinal infiltration in the posterior pole (Figure 2(a)).
To understand the effects of macular degeneration, put a fist in front of your face and there will be a blind spot (scotoma) in the centre of your visual field.