The colossal squid has the largest eyes in the world.
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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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The human eye blinks an average of 4,200,000 times a year.
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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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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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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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