anomalous trichromatism
   Also known as anomalous trichromasy. Both terms are used to denote those types of "colour vision deficiency in which one of the retinal cones malfunctions in such a way that the resulting deficiency is relative rather than absolute in nature. In trichromatic species such as Man, three types of anomalous trichromatism are distinguished, called "protanomaly, "deutanomaly, and " tritanomaly. The introduction of the term anomalous trichromatism has been attributed to the German colour physicist and physiologist Arthur Peter König (1856-1901). It is used in contrast to the terms "monochromatism and " dichromatism. In the latter conditions the colour vision deficiency is absolute, due to the absence of one or more of the retinal cone pigments.
   References
   Hsia, Y., Graham, C.H. (1965). Color blindness. In: Vision and visual perception.Editedby Graham, C.H. New York, NY: Wiley.
   McIntyre, D. (2002). Colour blindness. Causes and effects. Chester, PA: Dalton Publishing.

Dictionary of Hallucinations. . 2010.

Look at other dictionaries:

  • anomalous trichromatism — anomalous trichromatic vision …   Medical dictionary

  • anomalous trichromatism — noun : a slight defect of color vision in which the proportions of the three primary colors required in color mixture deviate from the normal compare color 1 …   Useful english dictionary

  • anomalous trichromasy —    see anomalous trichromatism …   Dictionary of Hallucinations

  • trichromatism — The state of being trichromatic. [tri + G. chroma, color] anomalous t. a defect in color perception in which there appears to be an abnormality or deficiency in one of the three primary pigments of the retinal cones. See …   Medical dictionary

  • Deuteranomaly — Colorblindness of the red green type, also known as deuteranopia or Daltonism. The term Daltonism is derived from the name of the chemist and physicist, John Dalton (1766 1844). Dalton was born in a village in Cumberland, England where his father …   Medical dictionary

  • colour vision deficiency —    Also known as colour blindness and anomalous colour vision. All three terms refer to the inability or diminished ability to distinguish between at least two colours. Although this group of visual deficiencies is traditionally known as colour… …   Dictionary of Hallucinations

  • deutanomaly —    Also known as deuteranomaly and anomalous trichromatic deuteranopia. All three terms are indebted to the Greek words deuteros (second), and anomalia (anomaly, irregularity). They translate roughly as an irregularity in the ability to perceive… …   Dictionary of Hallucinations

  • dyschromatopsia — A condition in which the ability to perceive colors is not fully normal. Cf.:anomalous trichromatism, dichromatism, monochromatism, chromatopsia. [dys + G. chroma, color, + opsis, vision] * * * n. any defect of colour vision. * * *… …   Medical dictionary

  • dichromatism —    Also known as dichromatopsia, dyschromatopsia, and parachromatopsia. The term dichroma tism comes from the Greek words dis (twice) and chroma (colour). It refers to a type of *colour vision deficiency in which one of the three colour receptor… …   Dictionary of Hallucinations

  • protanomaly —    The term protanomaly comes from the Greek wordsprotos (first) and anomalia (anomaly, irregularity). It translates loosely as an irregularity in the ability to perceive the first of the primary colours (i.e. red) . The term s introduction is… …   Dictionary of Hallucinations

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