| The genetic cause has been determined for several color vision defects, achromatopsia, blue monochromatism, protanopia, deuteranopia, and enhanced S-cone syndrome. |
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| There are a few tests we can use but the most commonly used one is Ishihara colour plates, which easily detect protanopia colour deficiency. |
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| Dichromacy is a moderately severe color vision defect. It is hereditary and, in the case of protanopia or deuteranopia, sex-linked, affecting predominantly males. |
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