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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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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The human eye blinks an average of 4,200,000 times a year.
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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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Those things you see in your eyes when you stare into space are called Mouches Voltanes, which are also broadly referenced to as Floaters.
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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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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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