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What is a mild protan?

Protan-type color vision deficiency is a type of red-green color blindness where the red cones in the eye do not detect enough red light, but instead respond more to green light.

As a result, many colors such as green, yellow, orange, red, and brown may appear confusingly similar. People with color blindness often also confuse blue and purple, and see pink as a shade of gray or white.