Eyes provide us with one of our five senses, sight. Arguably one of most important senses, without which we would literally be lost!
However we often take our eyes for granted and don’t appreciate them for what they are – complex structures which collect light and turns it into electrical impulses detected by our brains! If you want to know even more amazing facts about eyes, read on..!
1. Eyes contain around 107 million light-sensitive cells.
2. Some people are born with two differently colored eyes. This condition is heterochromia.
3. Around the world, about 39 million people are blind and roughly 6 times that many have some kind of vision impairment.
4. The average blink lasts for about 1/10th of a second.
6. The first blue-eyed person is said to have lived 6,000-10,000 years ago.
7. The eye is the fastest muscle in your body – hence why when something happens quickly, we say "in the blink of an eye!"
8. The human eye can differentiate approximately 10 million different colors.
9. The only part of the body that has no blood supply is the cornea of the eye. It receives oxygen directly from the air.
11. You blink your eyes over 10,000,000 a year.
12. It takes the human eyes an hour to adapt completely to seeing in the dark. Once adapted, however, the eyes are about 100,000 times more sensitive to light than they are in bright sunlight.
13. The farthest you can see with the naked eye is 2. 4 million light years away! (140,000,000,000,000,000,000 miles.) that's the distance to the giant andromeda galaxy. You can see it easily as a dim, large gray "cloud" almost directly overhead in a clear night sky.
14. Our eyes are always the same size from birth, but our nose and ears never stop growing.
16. Just behind our pupil is the lens - which is round, flat and thicker toward the middle.
17. Your eyelashes keep dirt out of your eyes.
18. The only cells that survive from the time you are born until death are in your eyes.
19. In the right conditions and lighting, humans can see the light of a candle from 14 miles away.
21. When you read or stare at a computer, you blink less often resulting in tired eyes.
22. The cornea is the transparent covering of the iris and pupil.
23. The eye muscles are the most active muscles in the human body.
24. Our eyes are made up of over 2 million working parts.
26. Albinism affects melanin production; perhaps resulting in extra sensitivity to light and a red-eyed appearance.
27. Astigmatism refers to a curvature of the cornea or lens and toric lenses are prescribed to aid the individual's vision.
28. When your eyes are watering it may be a sign of dry-eye, and your eyes are producing more moisture to compensate.
29. The average person blinks 12 times a minute (bet you just blinked!).
31. There are about 39 million people that are blind around the world.
32. Humans and dogs are the only species known to seek visual cues from another individual's eyes, and dogs only do this when interacting with humans.
33. Only 1/6 of the human eyeball is exposed.