There's a woman named Veronica Seider who had vision 20x better than average. She could identify people more than a mile (1.6km) away.
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Optical illusions occur when what the eyes see conflicts with what the brain expects.
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There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
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All humans have the ability to see ultraviolet light, but it is passively filtered out by the eye's lens. People who undergo surgery to remove the lens can detect ultraviolet light.
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Poor eyesight (myopia) is associated with higher IQ.
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In ancient Egypt, priests plucked EVERY hair from their bodies, including their eyebrows and eyelashes.
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When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
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