What problems are associated with color blindness?

Normal color vision requires healthy function of the macula and optic nerve. The most abnormality is red-green color blindness that happens in 8% of male patients. This is X-linked congenital deficiency of one specific type of retinal photoreceptor. Depressed color vision may also be a sensitive indicator of certain kinds of macular or optic disease. For example, if a person was punched by a fist, he or she would feel color abnormality that could be judged by color blindness test book. The other examples are optic neuritis or optic nerve compression or tumor. Ishihara More >