20 interesting facts about EYES may be unknown

1. 13 optical illusions make you not believe your eyes
2. Some simple stress relief and eye relaxation exercises
3. Only "2-minute" exercise will keep you awake immediately

As one of the most complex organs of the human body, continuous eyes make us feel surprised when there are many things that scientists still do not fully understand. From pupil expansion when you see your lover, until you can see 500 shades of gray, please join TipsMake.com to discover 20 interesting facts about EYES that you may not know in this article. Please!

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1. No matter how loud a newborn is, it is impossible to produce tears when they cry: because the tear duct is only active when the baby is 4 to 13 weeks old.

2. Both eyes have a small blind spot in the back of the retina where the optic nerve is attached, however you will not be aware because the eyes will work together to fill the blind spot in vision.

3. If your eyes are blue, you share an ancestral origin with everyone with blue eyes all over the world! About 6,000 - 10,000 years ago, everyone's eyes were brown until a gene mutant made their eyes blue.

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4. If you wear glasses that reverse the image, your brain will correct the vision and see the image in the right direction.

5. The human cornea is very similar to the cornea of ​​a shark, so in some cases, a shark's cornea is used to replace human eye surgery.

6. You runny nose when crying is due to tears flowing down that nose.

7. Mascara causes the most eye damage among cosmetics.

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8. Among all muscles, the muscles that control the eyes are the most active . The muscles that help the eyes move are the fastest and most powerful muscles in the body: they are 100 times stronger than necessary.

9. Average eye blinks 17 times per minute, 14,280 times per day and 5.2 million times per year . When you talk you will blink more and blink less when you watch your computer screen or paper, which is why your eyes are more tired.

10. People often read 25 times slower when looking at text on a computer screen than on paper.

11. Human eyes can distinguish 500 shades of gray .

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12. All children who are born are colorblind and boys are more likely to experience color blindness than girls.

13. Retinal scanning technology is becoming popular and increasingly used for security purposes: a fingerprint has 40 unique characteristics, while an iris has 256 characteristics.

14. The pupil will increase in size when you experience strong emotions, such as attraction, anger and enjoyment.The pupils of the eyes widen up to 45% when we look at the person we love .

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15. Eyes have amazing resilience: It can filter dirt and heal corneal scratches within 48 hours.

16. The eye is the second complex organ in the body, just behind the brain.

17. The function of tears is to keep eyes clean, but scientists still haven't figured out why we cry when we're sad.

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18. People say " in the blink of an eye " because it is the fastest muscle in the body. A blink of an eye usually lasts 100-150 milliseconds, can blink five times a second and we blink 5.2 million times a year on average .

19. Our eyes can recognize 10 million colors, but cannot recognize ultraviolet or infrared rays.

20. About half of the brain is used for sighting purposes, not for eyes. In many cases, blurred or poor vision is not all due to the eye. Maybe something goes wrong in the visual cortex of the brain.

See also: 7 healthy spine protection exercises for you

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