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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There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
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Tigers can see 6 times better at night than humans.
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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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Poor eyesight (myopia) is associated with higher IQ.
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In ancient Egypt, priests plucked EVERY hair from their bodies, including their eyebrows and eyelashes.
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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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