colour scotoma
   A term used to denote a variant of * achromatopsia, characterized by the inability or diminished ability to perceive a specific colour within an island-shaped part of the visual field.
   References
   Zeki, S. (1990). A century of cerebral achromatopsia. Brain, 113, 1721-1777.

Dictionary of Hallucinations. . 2010.

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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

  • Color blindness — Colorblind and Colourblind redirect here. For other uses, see Colorblind (disambiguation). Color blindness or color deficiency Classification and external resources An 1895 illustration of normal vision and various kinds of color blindness …   Wikipedia

  • Achromatopsia — Classification and external resources A person with complete achromatopsia would see only black, white and shades of grey. Additionally, the image would usually be blurry in brighter light (in the brightest light, effectively invisible) but would …   Wikipedia

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  • chromatopsia —    Also referred to as chromopsia. Both terms stem from the Greek words chroma (colour) and opsis (seeing). They are used to denote a temporary aberration in colour vision, characterized by an excessive sensitivity to one particular colour. As a… …   Dictionary of Hallucinations

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  • Macular degeneration — Classification and external resources Picture of the fundus showing intermediate age related macular degeneration. ICD 10 …   Wikipedia

  • corona phenomenon —    The term corona phenomenon is indebted to the Latin noun corona, which means crown. It was introduced in or shortly before 1966 by the Danish neuroscientists Axel Klee (1933 1982?) and Rolf Willanger to denote a *visual illusion consisting of… …   Dictionary of Hallucinations

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