Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
Our eyes are always the same size from birth, but our nose and ears never stop growing.
266
The colossal squid has the largest eyes in the world.
4
When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
1k
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22
Sheep, goats, octopuses, and toads have rectangular pupils.
7
Only about 2% of the world population has green eyes.
36