How do things look to colorblind people? 

Colorblindness is typically a genetic condition, and it is much more common in men than in women. Approximately one in 12 men has at least some color perception problems. Less common, acquired deficiencies stem from injury, disease, or the aging process. How do things look?

Ishihara Test for Color Blindness 

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About Color Blindness - What, why, how - problems 

Information about colorblindness - color deficiency - what it is, why it happens, how it works, problems color blind, colorblind, deficiency, color chart, color, chart, blind, challenged, disabled, dysfunctional, impaired, handicapped

Color blindness - color vision 

Color blindness may be a hereditary condition or caused by disease of the optic nerve or retina. color blindness, test, red green, color vision