For anyone who wondered what it would be like to see something as a color blind person would.
Color blindness 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. Also, although not called “color blindness,” when people age, their corneas typically turn yellowish, severely hampering their ability to see violet and blue colors.
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Also, a site that lets you upload images that it converts to a color blind image.
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