Scotoma

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Related to central scotoma: optic neuritis, centrocecal scotoma

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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However, despite resolution of ocular signs, all reported residual mild central scotoma that was reflected on HVF as an area of subtle decrease in sensitivity in the central vision (Figure 1).
For individuals with central scotomas, using an eccentric retinal area for visual tasks is necessary, because visual tasks such as fixation and reading can no longer be performed effectively with the foveal area [13].
Low vision practitioners commonly use the Bjerrum tangent screen as a method of mapping the central visual field or the central scotoma or both.
Visual field defects in nonarteritic anterior ischemic optic neuropathy (NA-AION) include altitudinal field defect (classically occurring in the inferior hemi field), central scotoma, arcuate scotoma, and quadrantic defects.
Dengue fever can lead to visual impairment in the form of blurring of vision (most common), central scotoma, micropsia/metamorphosia, floaters, visual field defect, near vision disturbance, impairment of color vision, ocular pain and redness visual field defect, detectable by ophthalmological exams such as angiography, retinography and OCT imaging, as well as retinal and cortical electrophysiology.
In an eye with a central scotoma affecting the entire fovea, one or more eccentric PRLs naturally and reliably develop [5-7,15-17].
A computer-and-video display-based system for training eccentric viewing in macular degeneration with an absolute central scotoma.
d Central scotoma, reduced visual acuity and metamorphopsia are some of the symptoms of this condition
27,28) Observation of an OCT image of a full thickness macular hole makes it easy to understand why patients experience a central scotoma and distortion due to absence of photoreceptors in the centre of the hole and the presence of a cystic fluid in the cuffs, respectively.
18) Visual acuity is typically 6/36-6/60 in these individuals, with an absolute central scotoma, severe photophobia and nystagmus.

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