central scotoma


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Related to central scotoma: optic neuritis, centrocecal scotoma

scotoma

 [sko-to´mah] (Gr.)
1. an area of lost or depressed vision within the visual field, surrounded by an area of less depressed or of normal vision.
2. mental scotoma. adj., adj scotom´atous.
absolute scotoma an area within the visual field in which perception of light is entirely lost.
annular scotoma a circular area of depressed vision surrounding the point of fixation.
arcuate scotoma an arc-shaped defect of vision arising in an area near the blind spot and extending toward it.
central scotoma an area of depressed vision corresponding with the fixation point and interfering with or abolishing central vision.
centrocecal scotoma a horizontal oval defect in the visual field situated between and embracing both the fixation point and the blind spot.
color scotoma an isolated area of depressed or defective vision for color in the visual field.
hemianopic scotoma depressed or lost vision affecting half of the central visual field; see also hemianopia.
mental scotoma in psychiatry, a figurative blind spot in a person's psychological awareness, the patient being unable to gain insight into and to understand his mental problems; lack of insight.
negative scotoma a scotoma appearing as a blank spot in the visual field; the patient is unaware of it, and it is detected only by examination.
peripheral scotoma an area of depressed vision toward the periphery of the visual field.
physiologic scotoma that area of the visual field corresponding with the optic disk, in which the photosensitive receptors are absent.
positive scotoma one which appears as a dark spot in the visual field.
relative scotoma an area of the visual field in which perception of light is only diminished, or loss is restricted to light of certain wavelengths.
ring scotoma annular s.
scintillating scotoma blurring of vision with the sensation of a luminous appearance before the eyes, with a zigzag, wall-like outline; called also teichopsia.

cen·tral sco·to·ma

a scotoma involving the fixation point.

cen·tral sco·to·ma

(sen'trăl skō-tō'mă)
A scotoma involving the fixation point.
References in periodicals archive ?
All patients demonstrated central scotoma due to macular pathology by means of Amsler chart reading and automated visual field (HVF) testing.
A computer and video display-based system for training eccentric viewing in macular degeneration with an absolute central scotoma. Documenta Ophthalmologica, 91, 9-16.
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].
Previous studies have reported that most solar retinopathy cases have a complete recovery of vision within a few weeks or months, although there are some cases in which there is decreased vision and/or central scotoma over a long period of time [8, 9].
Among three the most common mutations responsible for LHON, mutation 11778G>A carries the worst visual prognosis with the visual recovery rate of 4-7% [16] and large absolute central scotoma [17].
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.
Full text reading with a central scotoma: Pseudo regressions and pseudo line losses.
Patients complain of blurred vision in the central or paracentral visual field and varying degrees of metamorphopsia, micropsia, central scotoma, and low-contrast sensitivity.
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].
Of 136 eyes from 68 patients that underwent visual field examination, central scotoma accounted for 69.9%, cecocentral scotoma connected with blind spot for 8.0%, paracentral and temporal defect for 6.6%, and diffuse defect for 15.5%.

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