Optics
Color Vision Test
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Most people see a number hidden in each circle of dots, but some people see a different number, or none at all.
This is the Ishihara test for color vision. About 1 in 12 men and 1 in 200 women have trouble telling some reds and greens apart, because of differences in the color-sensing cells in their eyes.
Write down the number you see in each circle, then compare with a friend.
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