Free colorblind test

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Did you know that ...
bulls don't actually react to red?

Bulls are completely color blind. They charge the red cape because it is moving, not because it is red.

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Did you know that ...
the color blind can see in the dark?

They cannot see in total darkness, but they can distinguish details at a much lower light level than people with normal color vision.

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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 ...
people don't see colors at night?

Most people usually find it difficult to recognize colors at night in dim moonlight. However, geckos and frogs, for example, can see colors only when it's dark.

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