Free colorblind test

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Did you know that ...
some animals can see more colors than people?

Bees and butterflies can see colors people never see.

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Did you know ...
why Facebook is blue?

Because Mark Zuckerberg is red-green color blind. Blue is the richest color people with this type of color blindness can see, which is why it is Facebook's dominant color.

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Did you know that ...
the army needs the color blind?

The American army used to recruit color blind men, because they could see through camouflage better than people with normal sight.

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Did you know ...
who discovered color blindness?

John Dalton was the first to investigate color blindness and was color blind himself.
His diagnosis was confirmed in 1995, some 150 years after his death, by DNA analysis of his preserved eyeball, which he had donated to science.

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