- 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.ReferencesSacks, O. (1992). Migraine. Revised and expanded. New York, NY: Vintage Books.
Dictionary of Hallucinations. J.D. Blom. 2010.
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negative scotoma — a scotoma appearing as a blank spot in the visual field; the patient is unaware of it, and it is detected only by examination … Medical dictionary
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
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
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… … 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
fortification spectrum — Also known as fortification figure, fortification of Vauban, geometrical spectrum, herringbone, flittering scotoma, Norman arch, scintillating scotoma, telehopsia, and teichopsia. The introduction of the term fortification spectrum is commonly … Dictionary of Hallucinations
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escotoma negativo — Eng. Negative scotoma Escotoma que no es percibido por el paciente y que se detecta al practicarse una campimetría … Diccionario de oftalmología
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Afterimage — For other uses, see Afterimage (disambiguation). If the viewer stares at this image for 20 60 seconds and stares at a white object a negative afterimage will appear (in this case being cyan on magenta). This can also be achieved by the viewer… … Wikipedia