Interesting facts about the eyes and eyes of a person
It is with the help of vision that a person perceives most of the information from the outside world, that's why all the facts connected with the eyes are of interest to a person. To date, there are a lot of them.
Interesting facts about the eyes begin with the fact that a person is the only creature on the planet that has eye whites. In the rest the inner space of the eye is filled with cones and rods, as in some animals. These cells are in the eye in the amount of hundreds of millions and are photosensitive. The cones react to the change in illumination and colors more than the sticks.
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 all of its 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 eye protection from getting microbes from the nasal mucosa.
Interesting facts about eyesight and eyes often have data about what a person really sees in the brain, not the eye. This statement was scientifically established as far back as 1897, confirming that the person's eye perceives the surrounding information in an inverted form. Passing through the optic nerve to the center of the nervous system, the picture turns into a habitual position in the cerebral cortex.
Features of the iris
These include the fact that the iris of each person has 256 distinctive characteristics, while fingerprints differ only in forty. The probability of finding a person with the same iris is almost zero.
Distortion 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 can not 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 that, on the contrary, expands the spectrum of their perception of colors to hundreds of millions of shades.
Given the structure of the eye, interesting facts about it gave birth to iridodiagnostics. It is an unconventional method for diagnosing diseases of the whole body by examining the iris of the eye.
Blackout of the eye
It's interesting that the pirates wore bandages over their eyes not to hide their injuries. They closed one eye so that he could quickly 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 appeared not to protect from bright light, but to hide the look from unauthorized persons. They were used first only by Chinese judges, so as not to show people around their personal emotions to the cases in question.
Blue or brown?
The color of the human eye is determined by the amount of concentration in the body of the melanin pigment.
Iris is located between the cornea and the lens of the eye and consists of two layers:
Medical terms define them 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.
At birth, almost all children have this pigment completely missing, so the eyes of the newborns are blue. With age, they change their color, which is fully established only to 12 years.
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.
vision More than half a century ago, scientists established an interesting fact - at birth we are all long-sighted. Only to achieve a six-month-old 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 near the middle star handle large bucket( Big Dipper) can see a small star, then everything is fine.
Most often, such a violation is genetic and does not affect overall health. Different eyes color is called heterochromia and can be complete or partial. In the first case, each eye is colored with its own color, and in the second one the iris is divided into two parts with different colors.
Most of all, the quality of eyesight and eye health as a whole is affected by cosmetics. Also, the wearing of narrow clothes also has a negative effect, as it hampers the circulation of all organs, including the eye.
Interesting facts about the 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, tears do not appear at all.
The composition of the tear has three components:
If the proportions of these substances on the surface of the eye are not observed, dryness appears and the person begins to cry. With a plentiful flow of tears can directly enter the nasopharynx.
Statistical studies claim that every year a man cries an average of 7 times, and a woman 47.
About a blink
It is interesting that on average, a person blinks 1 time every 6 seconds more reflexively. This process provides the eye with sufficient moisture and timely cleansing from contaminants. According to statistics, women blink twice as often as men.
Japanese researchers have established that the blink 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 neural network falls off, therefore, blinking is most often observed after the completion of a certain action.
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.
Erroneous opinions of
Many believe that smoking does not affect the health of the eye, but in fact, tobacco smoke leads to blockage of the vessels of the retina and leads to the development of many 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 view that the radiation of the monitor negatively affects the vision. In fact, harm to the eyes brings an excessive voltage with frequent focusing on small details.
Also, many are convinced of the need to perform births only by cesarean delivery if the woman has poor vision. In some cases, this is true, but with myopia, you can undergo a course of laser coagulation and prevent the risk of rupture or detachment of the retina during childbirth. This procedure is carried out even at the 30th week of bearing the fetus and takes only a few minutes, without having a negative impact on the health of both the mother and the child. But anyway, try to regularly visit a specialist and check your eyesight.