The human eye blinks an average of 4,200,000 times a year.
233
Sheep, goats, octopuses, and toads have rectangular pupils.
7
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
Our eyes are always the same size from birth, but our nose and ears never stop growing.
266
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22
Tigers can see 6 times better at night than humans.
305
Only about 2% of the world population has green eyes.
36