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.
22
The colossal squid has the largest eyes in the world.
4
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.
22
Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
In ancient Egypt, priests plucked EVERY hair from their bodies, including their eyebrows and eyelashes.
130
Only about 2% of the world population has green eyes.
36
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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