positive scotoma

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.
   Sacks, O. (1992). Migraine. Revised and expanded. New York, NY: Vintage Books.

Dictionary of Hallucinations. . 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

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