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| 50 facts about eyes |
1. Brown eyes are actually blue underneath the brown pigment. There is even a laser procedure that can turn brown eyes blue forever.
2. The pupils of the eyes dilate 45 percent when we look at someone we love .
3. The cornea of the human eye is so similar to the cornea of a shark that the latter is used as a substitute for eye surgeries.
4. You cannot sneeze with your eyes open .
5. Our eyes can distinguish about 500 shades of gray .
6. Each eye contains 107 million cells , and they are all sensitive to light.
7. Every 12th male is color blind.
8. The human eye sees only three colors: red, blue and green . The rest of the colors are a combination of these colors.
9. Our eyes are about 2.5 cm in diameter and weigh about 8 grams .
10. Of all the muscles in our body, the muscles that control our eyes are the most active.
11. Your eyes will always remain the same size as at birth , and your ears and nose will not stop growing.
12. Only 1/6 of the eyeball is visible.
13. On average, over a lifetime, we see about 24 million different images .
14. Your fingerprints have 40 unique characteristics, while the iris has 256. It is for this reason that retinal scans are used for security purposes.
15. People say “you don't have time to blink an eye,” as this is the fastest muscle in the body. Blinking lasts about 100 - 150 milliseconds, and you can blink 5 times per second .
16. The eyes process about 36,000 particles of information every hour.
17. Our eyes focus on about 50 things per second .
18. Our eyes blink an average of 17 times a minute, 14,280 times a day and 5.2 million times a year.
19. The ideal duration of eye contact with the person you first meet is 4 seconds. This is necessary to determine what his eye color is.
20. We see with our brain, not our eyes . In many cases, blurry or poor vision is not caused by the eyes, but by problems with the visual cortex of the brain.
21. The images that are sent to our brain are actually inverted.
22. The eyes use about 65 percent of the brain's resources . It is more than any other part of the body.
23. The eyes began to evolve about 550 million years ago. The simplest eye was the particles of photoreceptor proteins in unicellular animals.
24. Each eyelash lives for about 5 months .
25. The Maya found strabismus attractive and tried to provide their children with strabismus.
26. The eyes of the octopus do not have a blind spot; they have developed separately from other vertebrates.
27. About 10,000 years ago, all people had brown eyes , until a person living in the Black Sea region developed a genetic mutation that led to blue eyes.
28. The wiggling particles that appear in your eyes are called " floaters ". These are the shadows cast onto the retina by tiny filaments of protein inside the eye.
29. If you pour cold water into a person's ear, the eyes will move towards the opposite ear. If you pour warm water into your ear, your eyes will move to the same ear. This test, called the caloric test, is used to determine if the brain is damaged.
30. If you only have one red eye in a flash photo , there is a possibility that you have an eye swelling (if both eyes are looking in the same direction at the camera). Fortunately, the cure rate is 95 percent.
31. Schizophrenia can be determined with an accuracy of 98.3 percent using a routine eye movement test.
32. Humans and dogs are the only ones who look for visual cues in the eyes of others, and dogs do this only by interacting with people.
33. About 2 percent of women have a rare genetic mutation that causes them to have an extra retinal cone. This allows them to see 100 million colors.
34. Johnny Depp is blind in his left eye and myopia in his right.
35. Recorded a case of Siamese twins from Canada, who have a common thalamus. Thanks to this, they could hear each other's thoughts and see each other's eyes.
36. The human eye can make smooth (non-intermittent) movements only if it follows a moving object.
37. The history of the Cyclops came about thanks to the peoples of the Mediterranean islands, who discovered the remains of extinct dwarf elephants. The elephant skull was twice the size of a human skull, and the central nasal cavity was often mistaken for the eye socket.
38. Astronauts cannot cry in space because of gravity. Tears collect in small balls and begin to pinch the eyes.
39. The pirates used a blindfold to quickly adapt their vision to the environment above and below deck. Thus, one eye became accustomed to bright light and the other to dim light.
40. The flashes of light that you see in your eyes when you rub them are called phosphenes.
41. There are colors that are too difficult for the human eye, and they are called " impossible colors ".
42. If you place two halves of ping-pong balls over your eyes and look at a red light while listening to a radio tuned in to interference, you will have vivid and complex hallucinations . This method is called the Ganzfeld procedure .
43. We see certain colors, as this is the only spectrum of light that passes through the water - the area where our eyes appeared. There was no evolutionary reason on earth to see a broader spectrum.
44. Apollo astronauts reported seeing flashes and streaks of light when they closed their eyes. It was later revealed that this was caused by cosmic radiation irradiating their retinas outside the Earth's magnetosphere.
45. Sometimes people with aphakia - lack of a lens, report seeing the ultraviolet spectrum of light .
46. Bees have hairs in their eyes. They help determine wind direction and flight speed.
47. About 65-85 percent of white cats with blue eyes are deaf.
48. One of the firefighters of the Chernobyl disaster has brown eyes turned blue due to the strong radiation received. He died two weeks later from radiation poisoning.
49. To watch out for nocturnal predators, many species of animals (ducks, dolphins, iguanas) sleep with one eye open . One half of their brain hemisphere is asleep while the other is awake.
50. Almost 100 percent of people over 60 years of age are diagnosed with herpes of the eyes at autopsy.
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