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
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
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
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