When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
1k
Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
Sheep, goats, octopuses, and toads have rectangular pupils.
7
In ancient Egypt, priests plucked EVERY hair from their bodies, including their eyebrows and eyelashes.
130
Those things you see in your eyes when you stare into space are called Mouches Voltanes, which are also broadly referenced to as Floaters.
9
The human eye blinks an average of 4,200,000 times a year.
233
The colossal squid has the largest eyes in the world.
4
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