Did You Know?
Only 1/6 of your eye is exposed. An average eye is roughly 2.5 cm in length and weighs around 7 grams. Short Sighted and long Sightedness occur when people have different axial lengths.
Cats do see in colour, and can distinguish yellow, blue, and green hues. Their eyes are best, however, at detecting movement, and shades of grey.
80% of all blindness can be prevented or treated (World Health Organization 2012)
While a fingerprint has 40 different unique characteristics, an iris has 256, hence the growing use of iris scans for security purposes.
The muscles that move the eye are the strongest relative to their size in the body.