Photopsins (also known as Cone opsins) are the photoreceptor proteins found in the cone cells of the retina that are the basis of color vision. Iodopsin, the cone pigment system in chicken retina, is a close analog of the visual purple rhodopsin that is used in night vision. Iodopsin consists of the protein component and a bound chromophore, retin...
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http://en.wikipedia.org/wiki/Photopsin
(from the article `visual pigment`) ...with vision in dim light and, in vertebrates, are found in the rod cells of the retina; the retinal1 forms are called rhodopsins, and the retinal2 ...
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http://www.britannica.com/eb/a-z/p/61
The protein moiety (opsin) of the pigment (iodopsin) in the cones of the retina. ... (05 Mar 2000) ...
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http://www.encyclo.co.uk/local/20973
Type: Term Pronunciation: fō-top′sin Definitions: 1. The protein moiety (opsin) of the pigment (iodopsin) in the cones of the retina.
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http://www.medilexicon.com/medicaldictionary.php?t=68654
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