scotoma /sco·to·ma/ (sko-to´mah) pl. scoto´mata
scintillating scotoma
1. an area of depressed vision in the visual field, surrounded by an area of less depressed or of normal vision.
2. mental s.scotom´atous
annular scotoma circular area of depressed vision surrounding the point of fixation.
central scotoma an area of depressed vision corresponding with the point of fixation and interfering with central vision.
centrocecal scotoma a horizontal oval defect in the field of vision situated between and embracing both the point of fixation and the blind spot.
color scotoma an isolated area of depressed or defective vision for color.
hemianopic scotoma depressed or lost vision affecting half of the central visual field.
mental scotoma a figurative blind spot in a person's psychological awareness, the person being unable to gain insight into and to understand their mental problems; lack of insight.
negative scotoma one which appears as a blank spot or hiatus in the visual field, the patient being unaware of it.
peripheral scotoma an area of depressed vision toward the periphery of the visual field, distant from the point of fixation.
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, the patient being aware of it.
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 teichopsia.
scin·til·lat·ing scotoma (s n tl-  tng)n. A localized area of blindness that may follow the appearance of brilliantly colored shimmering lights and is associated with the aura of migraine. |
scintillating scotoma
[sin′tilā′ting]
Etymology: L, scintillatio, sparkling; Gk skotos dark, oma tumor
an abnormal area of the visual field that is positive and luminous, sometimes becoming hemianopic and appearing in a migraine aura.
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