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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Only about 2% of the world population has green eyes.
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Tigers can see 6 times better at night than humans.
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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.
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The focusing muscles of the eyes move around 100,000 times a day. To give your leg muscles the same workout, you would need to walk 80km (50 miles) every day.
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Sheep, goats, octopuses, and toads have rectangular pupils.
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The human eye blinks an average of 4,200,000 times a year.
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