ANOMALY. Mutation or loss of a cone opsin can cause anomalous color vision. Set the vision type and severity and choose a scene to simulate anomalous color vision. Uncheck the box at the left to see the original image.
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Achromatopsia can result from loss of two or more cone types, leaving one with only rods or rods and one cone type. Such congenital monochromasy is extremely rare. Cerebral achromatopsia, resulting from injury to the ventral occipital lobe, is also rare. Protanopia is a form of red-green color-blindness resulting from complete loss of the long-wavelength opsin. It affects about 1% of European males. Protanomaly is a less severe form resulting from mutation of the opsin, affecting another 1% of European males. About 0.04% of European females are affected by some form of protanomaly. Deuteranopia is a form of red-green color-blindness resulting from complete loss of the medium-wavelength opsin. It affects about 1% of European males. Deuteranomaly is a less severe form resulting from mutation of the opsin, affecting about 5% of European males. About 0.4% of European females are affected by some form of deuteranomaly. Tritanopia results from complete loss of the short-wavelength opsin. It affects about 0.01% of European males and females. Tritanomaly is a less severe form resulting from mutation of the opsin, also affecting about 0.01% of European males and females. Normal trichromacy has three opsins, sensitive to short-, medium-, and long-wavelength. People with normal opsins can still have poor color vision from cataracts, a darkening of the lens with age and exposure to UV light. A few people even have tetrachromatic vision, due to mutation of an opsin, but this is impossible to simulate on a computer.