Human Eyes

Human Eyes

The eyes are one of the most expressive and attractive parts of the human body. About 90% of the information that we receive in life - we receive through sight. By the movement of the someone’s eyes, we can determine when he is embarrassed, lying, angry or sincerely happy.

"Eat carrots, they are good for the eyes!" - we hear since childhood. Yes, vitamin A in carrots is important for health. However, there is no direct link between eating carrots and good vision.

The eyes are the mirror of the soul, and it is difficult to argue with this statement. But how much do you know about eyes and vision? How many times per second does a person blink? What is the mass of the eyeball? You will find answers to these many questions in our article.

Here are some unusual facts about

Human Eyes

# 1. The weight of a human eye is about 8 grams, and the eye of a whale is 1kg.


# 2. The newborn cries without tears. Tears begin to form at 6 weeks of age.


# 3. Astronauts cannot cry in space as we do on earth. Tears do not flow down but remain in the form of small balls that are brushed off by hands.


# 4. If we compare the human eye with a digital camera, then the image size would be 576 megapixels.


# 5. Sneezing with open eyes is impossible.


# 6. The cornea of ​​the eye is the only part of the body that is not supplied with oxygen through the circulatory system, because the cornea must be as transparent as possible. Its cells receive dissolved oxygen from the air.


# 7. Man is the only creature that has the whites of the eyes! Even monkeys have completely black eyes. This makes it possible to identify other people's intentions and emotions by the eyes.


# 8. A person blinks on average every 4 seconds (15 times per minute), the blinking time is 0.5 seconds. It can be calculated that in 12 hours a person blink for 25 minutes.


# 9. Why do we close our eyes when kissing? We lower our eyelids so as not to faint, from an overabundance of feelings. During a kiss, the brain experiences sensory overload, closing our eyes we reduce the intensity of passions.


# 10. Eyes use 65 percent of the brain's resources.


# 11. The human eye can distinguish about 500 shades of gray.


# 12. The human eye sees only three colors: red, blue and green. The rest are a combination of these colors.


# 13. The red-eye effect in photographs is the reflection of flashlight from the vessels of the retina.


# 14. All babies are born with blue-gray eyes, and only after two years the eyes acquire their real color.


# 15. Our eyes focus on about 50 things per second.


# 16. Each eyelash lasts about 5 months.


# 17. The rarest human eye color is green. Only 2% of the world's population have green eyes.


# 18. Only 1% of people on Earth, the color of the iris of left and right eyes is not the same.


# 19. Despite the fact that our tears flow all the time (they wet our eyes), we cry relatively rarely. Women, for example, cry on average 47 times a year, and men – 7. And more often - between 6pm and 8pm, in 77% of cases at home, and in 40% - alone. Interestingly, 88% of the time, the person who cried gets better.


# 20. Women blink about twice as often as men.


# 21. A person has 150 eyelashes on the upper and lower eyelids.


# 22. The eye heals quickly - it only takes about 48 hours for the eye to heal a corneal scratch.


# 23. The eyeballs remain the same size from birth to death, while the nose and ears continue to grow for the rest of a person's life.


# 24. The eye is made up of over 2 million "working parts".


# 25. 80% of our memories are determined by what we see.


# 26. A fingerprint has 40 unique characteristics, but the iris has 256, which is why retinal scans are increasingly being used for security purposes.


# 27. The most common eye color in the world is brown.


# 28. When a person cries and his nose runs, these are tears that have flowed into the nasal passages.


# 29. A person sees with the brain, not with the eyes. The eyes act like a camera, capturing light and sending data to the brain.


# 30. When a person speaks, he blinks more often.


# 31. Screen reading speed is typically 25% slower than paper reading.


# 32. The older a person is, the fewer tears he produces.


# 33. The pirates believed that wearing gold earrings in their ears improved their eyesight.


# 34. Each person sees one eye better than the other.


# 35. The function of tears is to keep our eyes clean, but scientists still don’t understand why we cry when we’re upset.


# 36. When a person looks at someone he loves, his pupils dilate by 45%.


# 37. Too bright lighting is no less harmful to vision than lack of light.


# 38. Human eyes are fully formed by the age of 7 and have not changed their structure and size since then.


# 39. Diabetes and its associated complications can cause total or partial loss of vision.


# 40. Each of us has a "leading" and "guided" eye - by analogy with the hands.


# 41. The expression "eyes like an eagle" is no coincidence: the visual acuity of a feathered predator is twice that of a human. Eagles, falcons, and golden eagles are able to see a target 10 cm in size from a height of 1-1.5 km. This property is of great help to them while hunting.