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Visual colour changes and Bejeweled Blitz - is this the beginning of the end of the Ishihara Test?

A N Kanatas1, R A Loukota

  • 1Department of Oral and Maxillofacial Surgery, Leeds Teaching Hospitals NHS Trust, Leeds, United Kingdom.

The British Journal of Oral & Maxillofacial Surgery
|August 22, 2012
PubMed
Abstract

No abstract available in PubMed .

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Color perception begins in the retina, the light-sensitive layer at the back of the eye. Two main theories explain how colors are seen: the trichromatic theory and the opponent-process theory. The trichromatic theory, proposed by Thomas Young in 1802 and extended by Hermann von Helmholtz in 1852, suggests that color vision is based on three types of cone receptors in the retina. These cones are sensitive to different but overlapping ranges of wavelengths corresponding to red, blue, and green.