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-preserved vision. In a more specific sense, it is used to denote a type of scotoma that goes unnoticed by the affected individual and is only detected during examination of the visual field. When used in the latter sense, the term negative scotoma is used in opposition to the term * positive scotoma.
   Sacks, O. (1992). Migraine. Revised and expanded. New York, NY: Vintage Books.

Dictionary of Hallucinations. . 2010.

Look at other dictionaries:

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  • scotoma —    Also known as negative scotoma. The term scotoma comes from the Greek noun skotos (darkness). It is used to denote an area or island of loss or impairment of vision, surrounded by a field of normal or relatively well preserved vision. In… …   Dictionary of Hallucinations

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