ANOMALOUS TRICHROMATISM

anomalous trichromatism: translation

   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.