1. The weight of the eye is about 7 g, and the diameter of the eyeball is practically the same in all healthy people and is equal to 24 mm.
2. "Eat carrots, they are good for the eyes!" - we hear from childhood. Yes, vitamin A in carrots is important for health. However, there is no direct link between eating carrots and good vision. The beginning of this belief was laid in the Second World War. The British have developed a new radar that allows pilots to see German bombers at night. To cover up the existence of this technology, the British Air Force circulated press reports that such a vision was the result of the pilots' carrot diet.
3. All babies are born with blue-gray eyes, and only two years later the eyes acquire their real color.
4. The rarest human eye color is green. Only 2% of the world's population have green eyes.
5. All people with blue eyes can be considered relatives. The fact is that the blue color of the eyes is the result of a mutation in the HERC2 gene, due to which the production of melanin in the iris of the eye is reduced in carriers of such a gene, namely, the color of the eyes depends on the amount of melanin. This mutation arose about 6-10 thousand years ago in the northwestern part of the Black Sea coast. To make it easier to navigate - this is where Odessa is.
6. In 1% of people on Earth, the color of the iris of the left and right eyes is not the same.
Promotional video:
7. The simplest test for visual acuity. Look at the sky at night, find the Big Dipper. And if in the handle of the bucket, near the middle star, you clearly see a small asterisk, then your eyes have normal sharpness. This method of testing eyesight was adopted by the ancient Arabs.
8. In theory, the human eye is capable of distinguishing 10 million colors and about 500 shades of gray. However, in practice, a good result is the ability to distinguish at least 150 colors (and then after a long training).
9. Drawing of the iris of an eye in a person is individual. It can be used to identify a person.
10. The inhabitants of the Baltic States, northern Poland, Finland and Sweden are considered the most light-eyed Europeans. Most of the people with dark eyes live in Turkey and Portugal.
11. 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 most often - between 18.00 and 20.00, in 77% of cases at home, and 40% - alone. 88% of the time, the person who cried gets better.
12. A person blinks on average every 4 seconds (15 times per minute), the blinking time is 0.5 seconds. It can be calculated that a person blinks for 25 minutes in 12 hours.
13. Women blink about twice as often as men.
14. A person has 150 eyelashes on the upper and lower eyelids.
15. Sneezing with open eyes is impossible.
