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20 interesting facts about eyes
As one of the most complex organs on the human body, the eye is constantly amazed over and over again, as scientists learn more about it.
From enlarged pupils at the sight of someone you love, to 500 visible gray shades, learn more about eyes that you never knew before!
Despite the noises of babies, they really can't shed tears when they cry: their tear ducts don't start working until they're 4-13 weeks old.
Both eyes have a blind spot behind the retina where the optic nerve attaches, however you won't notice this, due to the way the eyes work together to fill the gaps in your vision.
Everyone in the world with blue eyes shares a common ancestor: the first person with blue eyes lived 6,000-10,000 years ago, and before that, everyone had brown eyes.
If you wear image reversing glasses, your brain will eventually correct your eyesight and you will see everything in the correct direction.
Some eye surgeries use shark corneas, as they are most similar to the human cornea.
A runny nose when you cry is the tears flowing from your eyes to your nose.
The mascara wand causes the most injuries out of any cosmetic product.
The muscles that move the eyes are the fastest and most powerful in the body: they are 100 times stronger than they should be.
You blink more while talking and you blink less when reading paper or a computer screen - the reason behind your eyes is more tired.
People typically read on the screen 25 times slower than on paper.
The human eye can see 500 shades of gray.
Newborns are color blind and men are more prone to colorblindness than women.
Retinal scans are being used more for security purposes: fingerprints have 40 distinct features, while the iris has 256.
Students increase their size under the influence of strong emotions, such as attraction, disgust, and enjoyment.
The eye has great healing power: it can filter out dirt and heal scratches within 48 hours.
The eye is the second most complex organ in the body, behind the brain.
The function of tears is to keep eyes clean, but scientists have yet to find out why we cry when we are sad.
One blink usually lasts about 100 - 150 milliseconds, and we blink 5.2 million times a year on average.
The eye can detect more than 10 million shades of color, but it cannot pick up ultraviolet or infrared rays.
About half of the brain is used for seeing and seeing.
