Color blindness or color vision deficiency is the inability or decreased ability to see color, or perceive color differences, under lighting conditions when color vision is not normally impaired. "Color blind" is a misleading term; there is no actual blindness but there is a fault in the development of either or both sets of retinal cones that perceive color in light and transmit that information to the optic nerve.
Jack failed the Ishihara test because he has Color Blindness.
by Mr. Hasnoface December 02, 2011

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