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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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.
21
The human eye blinks an average of 4,200,000 times a year.
233
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
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Sheep, goats, octopuses, and toads have rectangular pupils.
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In ancient Egypt, priests plucked EVERY hair from their bodies, including their eyebrows and eyelashes.
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The colossal squid has the largest eyes in the world.
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