How is myopia formed? How is myopia formed?

Etiology: The main causes of myopia are as follows:

1.Genetic factors High myopia has a certain familial genetic predisposition. Families with high myopia will have a higher incidence of myopia in the next generation.

2.Improper use of eyes Adolescent myopia is mainly caused by long-term eye proximity. Long-term myopia will lead to excessive tension in eye adjustment, forming pseudomyopia, and if it is not corrected, it will further form true myopia.

The increase in the time of modern people using electronic devices will not only cause eye fatigue, blurred vision and dry eyes because of the long time spent on the eyes, but also because of the light off and play with mobile phones at night, because the light is too strong, it is easy to cause eye fatigue and cause myopia.

There are two main causes of myopia: first, genetic factors of parents; Second, it is caused by long-term heavy eye use. If both parents of a child are highly myopic, the child will basically develop myopia.

In junior high school and high school, both the high school entrance examination and the college entrance examination require students to use a lot of eyes, which is also a very important reason for the high incidence of myopia. In order to avoid myopia, the course should be arranged in an orderly manner, every 40 to 50 minutes of work, be sure to rest for 10-15 minutes, and look far away to slow down the occurrence of myopia.

Epidemiology: more common in clerical work or other close proximity workers.

The formation of myopia is divided into genetic and acquired factors. Some people are born with myopia due to the influence of genetics. The acquired factor is that the lens is deformed due to long-term use of mobile phones or studying, which makes the eyes stare at one place for a long time, resulting in myopia!

There are many reasons for myopia, including congenital myopia, acquired incorrect posture, and accidents.

Staring at one place for a long time without moving, the eyes will be tired, and myopia will be formed after a long time.

1. Lack of sleep: 10-13 years old is the peak period for the formation of myopia. If children at this age do not get enough sleep, the sympathetic and parasympathetic nerve functions will lose their balance, resulting in the regulatory function of the ciliary muscle, so sleeping for 9-11 hours a night can protect eyesight.

2. Eating too many sweets: Sweets are acidic foods, on the one hand, a large amount of calcium in the body is consumed, and on the other hand, it raises blood sugar and changes the osmotic pressure of crystals, which is another bane that leads to the formation of myopia.

3. Mineral elemental element insufficiency: medical studies have shown that calcium, chromium and other mineral elements are an important condition for children's normal vision, and calcium elemental element has an irreplaceable role in maintaining the normal pressure of the eye lens and chromium in maintaining the eye refraction. In particular, it should be noted that processing too fine rice and noodles will lose 80% of the chromium element, and deliberately eating some whole grains is beneficial to eye health.

4. Noise: When the sound intensity is above 90 decibels, the sensitivity of rod cells in the fundus visual retina to distinguish the brightness of light begins to decrease, and the time to identify the weak light response is prolonged, when it exceeds 45 decibels, 40% of people have dilated pupils, and when it reaches 115 decibels, the adaptability of the eyes to light brightness decreases by 20%, accompanied by weakened color vision ability.

5. Lack of eye nutrition: Studies have shown that the lack of eye nutrition leads to extreme fatigue of the eyes, which leads to the formation of myopia. Therefore, it is necessary to regularly supplement eye nutrition, because eye nutrition is like the ink cartridge of a printer, and toner is nutrition, and toner cannot be synthesized through the body, and it needs to be continuously ingested from the periphery.

Therefore, doctors recommend regular supplementation of eye vision nutrients to supplement eye nutrition, so as to prevent or control myopia.

Myopia prevention and control is not only a problem that children and parents need to pay attention to, but also requires the joint efforts of the whole society to comprehensively prevent and control myopia.

Myopia is mainly due to the anterior and posterior diameter of the eyeball is too long or the surface of the eyeball is too convex, so that the external light can not be accurately focused on the retina, so myopia eye surgery is the use of excimer laser to refractive cutting of the stromal layer under the corneal flap, so as to reduce the corneal curvature in the pupil area, so that the external light can accurately focus on the retina, and finally achieve the purpose of correcting myopia.

The formation of myopia is divided into genetic and acquired factors. Some people are born with myopia due to the influence of genetics. The acquired factor is that the lens is deformed due to long-term use of mobile phones or studying, which makes the eyes stare at one place for a long time, resulting in myopia!

Myopia is caused by long-term use of eyes and not paying attention to rest, close use of electronic products, long-term strong light exposure, usually reading books and newspapers in a low-light environment, reading relatively small words, etc.

Myopia is a type of refractive error. There are mainly internal and external causes for the formation of myopia. Internal causes, unfortunately, are caused by genetics. In terms of external factors, it is related to the environment experienced by the growth and development of the eyes. Lack of nutrients, or poor eye habits.

Internal causes: genetic factors, myopia at birth.

External factors: environmental factors and physical fitness. The eye may be due to the lack of some important nutrients, which makes the eye tissue more fragile, and at the same time, under the action of external environmental factors, the sclera of the eye wall is easy to expand, so that the anterior and posterior axis of the eye is elongated and myopia occurs.

The formation of myopia is generally inherited in families, but there are also acquired environmental factors. The formation of high myopia is mostly due to the fact that parents have myopia, and the probability of inheritance in children will be higher. Similarly, acquired environmental factors will also make children become myopia, such as children who are tired of studying at school will lie on the table to read books and become myopic if they are too close to books, because of the pressure of learning, and when they get home, they will be a bunch of homework, and the child's eyes will gradually form myopia.

Congenital genetic factors: Studies have shown that families with both parents with high myopia have a higher incidence of myopia in the next generation of children, and it has been recognized that myopia has a certain genetic predisposition, especially for high myopia. However, the genetic predisposition to myopia in general is not obvious.

Improper diet of pregnant women in the fetal period can easily lead to myopia in the baby: excessive sugar intake by pregnant women may cause sugar accumulation in the body, and when sugar is metabolized in the body, a large amount of vitamins are needed, so vitamins will be insufficient due to excessive consumption. As a result, babies are deficient in vitamins, and the development of optic cells in the eyes also requires a large amount of vitamins.

As a result, the optic cells in the eye do not develop properly.

Improper diet: the lack of certain or some important nutrients in the eye during growth and development makes the eye tissue more fragile, and under the action of environmental factors, the sclera of the eye wall is easy to expand, so that the anterior and posterior axes of the eye are elongated and myopia occurs. Eating less sugar and eating more high-quality protein foods and coarse grains such as milk, eggs, milk, fish, meat, chicken can help prevent myopia.

Wrong learning posture: For example, writing on your stomach, tilting your head to read a book, reading books for a long time and doing homework, and your eyes and textbooks are very close to each other, which can easily lead to myopia.

Sleep with the lights on at night: If the child is afraid of the dark and is used to sleeping with the light on at night, it will make the child's eyes not really relax, and the accumulation of time will form myopia.

Uncoordinated lighting when studying: Some students read and study in too strong or too dim light, and it is very easy to get myopia in the long run.

The first is the developmental factor, the small eyeball in childhood is farsighted, and then gradually develops into an emmetropic eye, and if the eye is overdeveloped, it will form a myopic eye.

The second is environmental factors, due to the lack of attention to eye hygiene during the development of the eyeball in adolescents, poor hygiene habits have been developed, such as improper lighting, too close reading distance, excessive eye use and poor posture, etc., which can promote the occurrence of myopia.

It is generally believed that high myopia is autosomal recessive inheritance, and low and medium myopia is polygenic inheritance, the refractive power of the eye is too strong, the length of the eye axis is normal, and the curvature of the cornea and lens surface increases, as well as the refractive index of the aqueous humor and the lens increases, so that the parallel rays entering the eye form a focus before the retina, and form refractive myopia.

1. The distance between the eyes is too close.

Being too close to the eye is one of the main causes of myopia, because too close to the eye will cause abnormalities in the eyeball, which will induce myopia over time. Relevant data show that the reason why teenagers and children will get myopia has a lot to do with the distance between the eyes, under normal circumstances, the adjustment of the human eye is relatively strong, even if the distance between the eyes and the book reaches 7 to 10 cm, you can still see the font in the book, but if you often read at such a close distance, it is easy to cause eye adjustment tension, and then induce refractive myopia.

2. Spending too much time with your eyes.

Many people often use their eyes for a long time when they are studying or working, or often watch TV until late at night, but they don't know that this long-term eye use behavior will cause a great burden on the eyes, and for a long time, it will make the muscles unable to relax and spasm, and eventually form myopia.

3. Lie down and read a book or play with your mobile phone.

Nowadays, many people are more lazy, whether they are reading books or playing with mobile phones, they like to lie down, which is a bad habit of reading and one of the main reasons for myopia. Because when lying down to read a book or play with a mobile phone, the eyes can not maintain a horizontal reading state, and it is easy to get tired after a long time, and because the eyes are not in a horizontal state, and the distance between the eyes and the objects is inconsistent, the adjustment function of the eyes will be abnormal, and then the burden on the eyes will be increased, and myopia will be formed over time.

Vision is a type of refractive error. When the eye is in a relaxed state of accommodation, parallel light rays enter the eye and focus in front of the retina, which causes a clear image to be formed on the retina, which is called myopia. At this time, the refraction examination will indicate the degree of myopia, such as 50 degrees of myopia, which is usually called 50 degrees of myopia, and is recorded as ".

I relax in eye adjustment.

Most myopia has a genetic predisposition, most of the high myopia belongs to autosomal recessive inheritance, and there are also certain racial differences, the probability of myopia in yellow people is relatively high, and black people basically do not have myopia.

Myopia can lead to vision loss, which is related to bad habits, like watching TV, watching tablets, it is easy to cause myopia. However, myopia is also related to genetic factors, families with both parents with high myopia, the incidence of myopia in the next generation of children is higher, and it has been recognized that myopia has a certain genetic predisposition, especially for high myopia. However, the genetic predisposition to myopia in general is not obvious.

There are two ways to develop myopia.

One is congenital myopia.

One is the usual overuse of the eyes, or external force injury, resulting in acquired myopia.

How does myopia develop? Myopia is caused by overuse or improper use of the eyes.

Myopia refers to when the eye is adjusted to rest, the parallel beam enters the eye and the focus point falls in front of the retina, also known as hyperopic eye, myopia is divided into simple myopia and pathological myopia, each of which has its own characteristics; The formation of myopia is mainly related to the elongation of the eye axis and the excessive refractive power. The focal point of parallel rays that elongate into the eye is located before the retina, which is the most common cause of myopia and is often called axial myopia. There are many reasons for the elongation of the eye axis, first of all, developmental factors, the small eyeball in childhood is farsighted, and then gradually develops into an emmetropic eye, if the eye is overdeveloped, it will form a myopic eye; The second is environmental factors, due to the lack of attention to eye hygiene during the development of the eyeball in adolescents, they have developed bad hygiene habits, such as improper lighting, poor reading habits, etc., and excessive eye use can also promote the occurrence of myopia, and then genetic factors, there is a family history of high myopia, and it is currently believed that high myopia is an autosomal recessive genetic disease.

The refractive power of the eye is too strong, the length of the eye axis is normal, and the curvature of the cornea and lens surface increases, as well as the refractive index of the aqueous humor and the lens increases, so that the parallel rays entering the eye form a focus in front of the retina, and refractive myopia is formed. Both axial myopia and refractive myopia have an impact on vision and need to be corrected**.

Too much use of eyes at close range.