ishihara test color blindness disease |
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navigate by keyword : background blind blindness brain chart circle clear color colorblind dalton daltonism deuteranopia diagnostic dichromacy digit dots effect eye funny grey health hue illusion indication invisible iris medical monochrome nerve number optical orange patterns plate play protanopia radiotherapy randomized redgreen retina scientific see sense shade spot test various view visible vision weakness |
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Ishihara Test. , color blindness disease. perception test, |
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