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

Dictionary of Hallucinations. . 2010.

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