In ancient Egypt, priests plucked EVERY hair from their bodies, including their eyebrows and eyelashes.
130
The human eye blinks an average of 4,200,000 times a year.
233
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
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
There's a woman named Veronica Seider who had vision 20x better than average. She could identify people more than a mile (1.6km) away.
22
Sheep, goats, octopuses, and toads have rectangular pupils.
7
Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
1k