When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
1k
Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
Sheep, goats, octopuses, and toads have rectangular pupils.
7
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
Only about 2% of the world population has green eyes.
36
Tigers can see 6 times better at night than humans.
305
The colossal squid has the largest eyes in the world.
4