All humans have the ability to see ultraviolet light, but it is passively filtered out by the eye's lens. People who undergo surgery to remove the lens can detect ultraviolet light.
21
Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
Most of us have microscopic, worm like mites named Demodex that live in our eyelashes and have claws and a mouth.
-137
Sheep, goats, octopuses, and toads have rectangular pupils.
7
There's a woman named Veronica Seider who had vision 20x better than average. She could identify people more than a mile (1.6km) away.
22
Tigers can see 6 times better at night than humans.
305
Poor eyesight (myopia) is associated with higher IQ.
232
Only about 2% of the world population has green eyes.
36