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
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22
The human eye blinks an average of 4,200,000 times a year.
233
The colossal squid has the largest eyes in the world.
4
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
In ancient Egypt, priests plucked EVERY hair from their bodies, including their eyebrows and eyelashes.
130