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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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.
22
The human eye blinks an average of 4,200,000 times a year.
233
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
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Sheep, goats, octopuses, and toads have rectangular pupils.
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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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Most of us have microscopic, worm like mites named Demodex that live in our eyelashes and have claws and a mouth.
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