- positive scotoma
- A term used to denote a type of*scotoma (i.e. an area of loss or impairment of vision) presenting as a black spot within the field of vision. The term positive scotoma is used in opposition to the term * negative scotoma, which refers to a type of sco-toma that tends to go unnoticed by the affected individual and is detected only upon examination of the visual field.ReferencesSacks, O. (1992). Migraine. Revised and expanded. New York, NY: Vintage Books.
Dictionary of Hallucinations. J.D. Blom. 2010.
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positive scotoma — a scotoma subjectively perceived as a black spot in the visual field, and of which the patient is aware … Medical dictionary
scotoma — 1. An isolated area of varying size and shape, within the visual field, in which vision is absent or depressed. 2. A blind spot in psychological awareness. [G. skotoma, vertigo, fr. skotos, darkness] absolute s. a s. in which there is no… … Medical dictionary
negative scotoma — The term negative scotoma is indebted to the Greek noun skotos (darkness). It is used in a general sense to denote an area or island of loss or impairment of vision (i.e. a * scotoma), surrounded by a field of normal or relatively well… … Dictionary of Hallucinations
Carl Friedrich Richard Förster — (November 15, 1825 July 7, 1902) was a German ophthalmologist who was born in the town of Lissa (today Leszno, Poland). He received his medical doctorate in 1849, and for most of his career was associated with the University of Breslau. Two of… … Wikipedia
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