The colossal squid has the largest eyes in the world.
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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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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 human eye blinks an average of 4,200,000 times a year.
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Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
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Sheep, goats, octopuses, and toads have rectangular pupils.
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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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Only about 2% of the world population has green eyes.
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