Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
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
Poor eyesight (myopia) is associated with higher IQ.
232
The human eye blinks an average of 4,200,000 times a year.
233
Tigers can see 6 times better at night than humans.
305
The colossal squid has the largest eyes in the world.
4