Only about 2% of the world population has green eyes.
36
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
Our eyes are always the same size from birth, but our nose and ears never stop growing.
269
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
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
If the human eye was a digital camera, it would have 576 megapixels.
25