Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
If the human eye was a digital camera, it would have 576 megapixels.
25
Only about 2% of the world population has green eyes.
36
Sheep, goats, octopuses, and toads have rectangular pupils.
7
Our eyes are always the same size from birth, but our nose and ears never stop growing.
266
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
The human eye blinks an average of 4,200,000 times a year.
233
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