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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If the human eye was a digital camera, it would have 576 megapixels.
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The human eye blinks an average of 4,200,000 times a year.
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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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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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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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Sheep, goats, octopuses, and toads have rectangular pupils.
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