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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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.
36
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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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.
21
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
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
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Optical illusions occur when what the eyes see conflicts with what the brain expects.
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