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Approximately 7% of all men are color-blind, but only about 0.4% of women.
To most color-blind people a red fire engine, green grass, and all 3 traffic lights appear yellow.
In rare instances, some people are yellow/blue color-blind, and unable to tell the difference between the two colors.
In the most extreme form of color-blindeness, a person perceives only shades of gray and the world looks much like a black-and-white television does to most other people.
To most color-blind people a red fire engine, green grass, and all 3 traffic lights appear yellow.
In rare instances, some people are yellow/blue color-blind, and unable to tell the difference between the two colors.
In the most extreme form of color-blindeness, a person perceives only shades of gray and the world looks much like a black-and-white television does to most other people.