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4 Eye Tests That Look Like Magic

Seeing is believing.

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There are lots of very cool, very easy experiments you can do to learn more about your eyes. Here are a few of our favorites.

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Your eyes have three types of color receptors: red, green, and blue. After-images appear when you stare at a particular color for too long and those receptors get tired. So stare at the white dot at the center of this image without blinking.