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Eyes:Facts You Probably Didn't Know About Them

You’ve had your peepers since you were born, so you may think you know them pretty well, but here are some fun facts you may not know about eyes:

1. The average blink lasts for about 1/10th of a second.
2. While it takes some time for most parts of your body to warm up to their full potential, your eyes are on their “A game” 24/7.
3. Eyes heal quickly. With proper care, it only takes about 48 hours for the eye to repair a corneal scratch.
4. Seeing is such a big part of everyday life that it requires about half of the brain to get involved.
5. Newborns don’t produce tears. They make crying sounds, but the tears don’t start flowing until they are about 4-13 weeks old.
6. Around the world, about 39 million people are blind and roughly 6 times that many have some kind of vision impairment.
7. Doctors have yet to find a way to transplant an eyeball. The optic nerve that connects the eye to the brain is too sensitive to reconstruct successfully.
8. The cells in your eye come in different shapes. Rod-shaped cells allow you to see shapes, and cone-shaped cells allow you to see color.
9. You blink about 12 times every minute.
10. Your eyes are about 1 inch across and weigh about 0.25 ounce.
11. Some people are born with two differently colored eyes. This condition is heterochromia.
12. Even if no one in the past few generations of your family had blue or green eyes, these recessive traits can still appear in later generations.
13. Each of your eyes has a small blind spot in the back of the retina where the optic nerve attaches. You don’t notice the hole in your vision because your eyes work together to fill in each other’s blind spot.
14. Out of all the muscles in your body, the muscles that control your eyes are the most active.
15. 80% of vision problems worldwide are avoidable or even curable.

Your retinas actually perceive the outside world as upside-down – your brain flips the image for you.

In addition to being upside-down, images arrive at your retina split in half and distorted.

Your retinas cannot detect the colour red.

Your peripheral vision is very low-resolution and is almost in black-and-white

Got blue eyes? You share an ancestor with all other blue-eyed people across the world

If you’re blind, but were born with sight, you probably still see images in your dreams.

“20/20 vision” doesn’t equal perfect vision. It just means you can see 20 feet in front of you as well as the average person can.

If you’re shortsighted, your eyeball is longer than normal. If you’re farsighted, it’s shorter than average.

Your eyes are almost the same size as they were when you were born. And newborn babies can see clearly up to 15 inches away.

Your tears have different composition based on whether something’s irritating your eye, or you’re crying, or yawning.

Your eye is constantly making tiny jerking movements called “microsaccades” to stop objects from fading from your vision.

your eye can distinguish between 50,000 shades of grey