Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
The human eye blinks an average of 4,200,000 times a year.
233
Our eyes are always the same size from birth, but our nose and ears never stop growing.
266
Sheep, goats, octopuses, and toads have rectangular pupils.
7
The colossal squid has the largest eyes in the world.
4
Most of us have microscopic, worm like mites named Demodex that live in our eyelashes and have claws and a mouth.
-137
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