Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
Sheep, goats, octopuses, and toads have rectangular pupils.
7
Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22
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
Tigers can see 6 times better at night than humans.
305
Our eyes are always the same size from birth, but our nose and ears never stop growing.
266
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