Health, Vision
Interesting facts about the eyes and sight of a person
It is with the help of vision that a person perceives most of the information from the outside world, therefore all the facts related to the eyes are of interest to man. To date, there are a lot of them.
Structure of the eye
In all adults, the size of the eyeball is almost identical and is 24 mm in diameter, while the newborn baby has an apple diameter of 18 mm, and the weight is almost three times smaller.
It is interesting that sometimes a person can see before his eyes various floating opacities, which in reality are strands of protein.
The cornea of the eye covers its entire visible surface and is the only part of the human body that is not supplied with oxygen from the blood.
The lens of the eye, providing a clear vision, constantly focuses on the environment at a rate of 50 subjects per second. The eye moves with only 6 eye muscles, which are the most active in the whole body.
Interesting facts about the eyes include information that you can not sneeze with your eyes open. Scientists explain this by two hypotheses - reflex reduction of facial muscles and protection of the eye from getting microbes from the nasal mucosa.
Brain Vision
Iris Features
They include the fact that the iris of each person has 256 distinctive characteristics, while fingerprints differ only in forty. The likelihood of finding a person with the same iris is almost zero.
Violation of color perception
Most often this pathology manifests itself as color blindness. It is interesting that all children are born with colorblind, but with age, the majority perception of colors comes back to normal. Most often, men suffer from this disorder who are not able to see certain colors.
Normally, a person should divide the seven primary colors and up to 100,000 of their shades. Unlike men, 2% of women suffer from a genetic mutation, which, on the contrary, expands the spectrum of their perception of colors to hundreds of millions of shades.
Alternative medicine
Darkening the eyes
Interestingly, the pirates wore bandages over their eyes not to hide their injuries. They closed one eye so that he quickly could adapt to the poor lighting in the ship's holds. Alternately using one eye for rooms with dim lighting and decks with a bright light, the pirates could more effectively fight.
The first dark glasses for both eyes did not appear to protect against bright light, but to hide the look from unauthorized persons. They were used first only by Chinese judges, so as not to demonstrate to others the personal emotions to the cases under consideration.
Blue or brown?
The color of the human eye is determined by the amount of concentration in the body of the pigment melanin.
The iris is between the cornea and the lens of the eye and consists of two layers:
- Front;
- Rear.
Medical terms they are defined as mesodermal and ectodermal, respectively. It is in the fore layer that the coloring pigment is distributed, determining the color of the human eye. Interesting facts about the eyes confirm that the color of the iris is provided only by melanin, regardless of what color the eyes are. The hue changes only due to a change in the concentration of the colorant.
Interesting facts about the person's eyes also state that the color may vary depending on some circumstances. Scientists at the moment established a phenomenon such as a chameleon. It is a change in the color of the eye during prolonged exposure to cold or during prolonged bright illumination. Some people claim that the color of their eyes depends not only on the weather, but also on the personal mood.
The most interesting facts about the structure of the human eye contain data that in fact all people in the world are blue-eyed. High concentration of pigment in the iris provides absorption of light rays of high and low frequencies, due to which their reflection leads to the appearance of brown or black eyes.
The color of the eyes depends largely on the geographical area. So in the northern regions the population with the blue color of the eyes predominates. Closer to the south, there are a large number of brown-eyed, and at the equator almost the entire population has a black iris.
Interesting about vision
More than half a century ago, scientists have established an interesting fact - at birth we are all farsighted. Only to the achievement of six months of age, vision is normalized. Interesting facts about the eyes and vision of a person also confirm that the eye is fully formed by physiological parameters by the age of seven.
Vision can also affect the general condition of the body, so when overexposed to the eye, there is general fatigue, headaches, fatigue and stress.
It is interesting that the relationship between the quality of vision and carrot vitamin carrots has not been scientifically proven. In fact, this myth took its origin from the time of the war, when the British decided to conceal the invention of an airborne radar. They explained the rapid detection of enemy aircraft by the sharp eyes of their pilots who ate carrots.
To independently check the visual acuity, you should look at the night sky. If an average star handles a large bucket (Big Dipper), you can see a small star, then everything is fine.
Different eyes
Negative factors
Most of all, the quality of eyesight and eye health as a whole is affected by cosmetics. Also, the wearing of tight clothes also has a negative effect, as it hampers the circulation of all organs, including the eye.
Interesting about tears
Interesting facts about the structure and work of the eye confirm that the child is not able to cry in the first month of life. More precisely, there are no tears in it at all.
The composition of the tear has three components:
- Water;
- slime;
- fat.
If the proportions of these substances on the surface of the eye are not observed, dryness appears and the person begins to cry. With abundant flow of tears can directly enter the nasopharynx.
Statistical studies say that every year a man cries an average of 7 times, and a woman 47.
About blinking
Japanese researchers have established that the blinking process also acts as a reset for concentration of attention. It is at the moment of the closing of the eyelids that the activity of the neuronet of attention decreases, therefore, blinking is most often observed after the completion of a certain action.
Reading
Interesting facts about the eyes have not missed such a process as reading. According to scientists, with rapid reading, eyes are tired much less. At the same time, reading paper books is always done by a quarter faster than electronic media.
Wrong opinions
Many believe that smoking does not affect the health of the eyes, but in fact, tobacco smoke leads to blockage of the vessels of the retina and leads to the development of a variety of diseases of the optic nerve. Smoking, both active and passive, can lead to clouding of the lens, chronic conjunctivitis, retinal yellow spots, blindness. Also, when smoking becomes harmful, lycopene.
In normal cases, this substance has a beneficial effect on the body, improving eyesight, slowing the development of cataracts, age-related changes and protecting the eye from ultraviolet radiation.
Interesting facts about the eyes disprove the opinion that the radiation of the monitor negatively affects the eyesight. In fact, damage to the eyes brings an excessive voltage with frequent focusing on small details.
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