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

Dictionary of Hallucinations. . 2010.

Look at other dictionaries:

  • 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

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  • escotoma positivo — Eng. Positive scotoma Escotoma que es percibido subjetivamente por el paciente …   Diccionario de oftalmología

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