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Most people assume that color blindness is only an inability to see red and green properly. This assumption greatly oversimplifies the condition, which is usually an inherited abnormality but is sometimes the result of disease. In normal color vision, any color a person sees can be identically matched or reproduced in the brain by a mixture of the three primary colors of light — red, green, blue. Proportions needed to match any given color of the spectrum are constant. This [...]

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