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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Tigers can see 6 times better at night than humans.
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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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Only about 2% of the world population has green eyes.
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Poor eyesight (myopia) is associated with higher IQ.
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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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