Sheep, goats, octopuses, and toads have rectangular pupils.
7
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
The focusing muscles of the eyes move around 100,000 times a day. To give your leg muscles the same workout, you would need to walk 80km (50 miles) every day.
21
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
Poor eyesight (myopia) is associated with higher IQ.
232
If the human eye was a digital camera, it would have 576 megapixels.
25
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