What are the causes of high myopia and how is high myopia caused

Myopia is caused by the long anteroposterior diameter of the eyeball, and the retina is too far away from the lens, so that parallel light from a distance cannot converge on the retina. You're right. The structure of the lens in the human eye resembles a convex lens, and true myopia is caused by the deformation of the lens caused by prolonged fatigue of the ciliary muscle, causing the anterior and posterior meridians of the eyeball to exceed the normal length; Pseudomyopia is caused by excessive tension in the ciliary muscle that stretches the lens, fatigue leads to spasms, and the lens refracts the lens.

Regardless of true or pseudomyopia, eat more animal liver, eggs, carrots, etc. You can also drink Zheng 9 flavor pupil tea to clear the liver and eyes, clear heat and remove fire, and protect the eyes and eyes.

Wu Qian, chief physician of the Department of Ophthalmology of Beijing Children's Hospital, wrote:

New insights into the causes of the development of high myopia The incidence of myopia in students is gradually increasing, and many of them have developed to more than 600 degrees. It is said that the acquired myopia should not exceed 400 degrees, because the true myopia of more than 300 degrees does not need to be adjusted if it is one foot away from reading a book, so most myopia experts believe that high myopia above 600 degrees belongs to congenital inheritance. But in reality, there are many students who have no family history and have become highly myopia, which forces us to change our concepts, Wu Qian, Department of Ophthalmology, Beijing Children's Hospital.

Find out the cause of high myopia. According to the principle of imaging, the object distance is inversely proportional to the intraocular image distance, and the object distance of distant objects is large and the intraocular image distance is small, and the normal eye image just falls on the retina, but when looking at close objects, the object distance is small and the image distance is large, and the image of the retina is not clear, and the eyeball should use the adjustment function of the eye to ensure that the image continues to be formed on the retina. If you read a book for one hour, you have to adjust for an hour, and if you read a book for one day, you have to adjust for a day.

Conditioning is energy-consuming, which is not good for the whole. Organisms will adapt to the environment to change themselves, and the eyeball will have to adjust to this long-term state of adjustment, and the structural compensation will be aroused by the functional compensation, resulting in the backward extension of the eyeball, and the eyeball can be extended backward by 1 mm to save about 300 degrees of adjustment. If you want to see the distance clearly, you need to wear myopia glasses of about 300 degrees, and wear suitable myopia glasses to see the distance clearly, but you have to adjust your reading.

Therefore, the eyeball has to continue to grow, and the myopia degree will continue to increase. After the myopia degree increases, the original myopia glasses are not suitable, and it is necessary to change to large-power myopia glasses, and change to large-power myopia glasses to see far clearly, but the near-sightedness has to be adjusted, and the myopia degree has to be long, so as to form a vicious circle. Some parents and even ophthalmologists have asked students to wear myopic glasses only when they are reading, which will force students who have no genetic relationship to become highly myopic step by step.

However, it is not possible to read without glasses, because when reading with normal eyes, it is both adjusted and gathered (medically called divergence), and after the eyeball is extended, reading does not need to be adjusted and has to be gathered (without gathering, both eyes cannot see a nearby target at the same time), and the adjustment and convergence are originally synchronized. Reading without myopia glasses will disrupt this synchronicity, and over time, you will lose both eyes at the same time (the image of one eye will be transmitted to the brain and the image of the other eye will be suppressed), and it may also cause strabismus.

In short, with general myopia glasses, you can only see far away, and you have to worry about reading or not wearing them. The ideal glasses are to turn the incoming eye line when looking near (when reading a book) into a distant vision through the lens group, so that the eyes do not need to adjust or diverge when reading a book, so as to fundamentally eliminate the ** that causes myopia. This kind of glasses for the prevention and treatment of myopia is still being explored and studied.

Personal summary. 1) Facing the computer for a long time. Since the eyes need to be lubricated by tears, the frequency of blinking will be much lower when staring at the screen. Therefore, the lubrication effect is poor.

2) The eyes cannot keep staring at objects at the same distance, and the muscles will get tired after a long time. The best way to do this is to watch TV or the computer for 30 minutes, massage it with your hands, and then alternate between looking at the distance and the near place.

3) Looking at your phone or reading a book in a shaky, poorly lit carriage.

I usually sit in the car and look into the distance, so I always relax my eyes. It would be better if I went home and played on the computer again.

There are congenital and acquired. Or sick myopia. The acquired ones are all caused by their own unreasonable use of eyes and protection.

If you don't pay attention to your eyes, you have to rest after an hour of surfing the Internet, or watch TV, and a few are congenitally inherited

Development: If myopia progresses too quickly in early childhood, it is easy to progress to high myopia.

Bad eye habits: Excessive use of electronic products will definitely increase the prevalence of people with high myopia! Teenagers have relatively low self-control and spend a lot of time on electronics every day.

Reading electronic devices for long periods of time and up close can have an impact on the development of the eyes.

There are several factors to high myopia:

Genetic factors. Excessive eye use in minors and lack of attention to eye habits.

Even in adulthood, there is often eye strain.

Usually do not pay attention to the forehead caused by eye protection.

Many myopia patients are caused by prolonged use of electronic devices. Looking at mobile phones and computer screens for more than 8 hours a day is the most likely to lead to high myopia.

High myopia is a pathological myopia, and the lack of high protein and some trace elements in the human body will cause high myopia to progress. Therefore, people with high myopia need to pay attention to nutrition, usually supplement more nutrition, eat some high-protein foods, and eat a balanced diet.

Nowadays, there are more and more myopic people, and many myopic people do not pay attention to their habits, resulting in deeper and deeper myopia, higher and higher degrees, thus forming a high degree of myopia. What are the dangers and symptoms of high myopia?Let me introduce you to the dangers and symptoms of high myopia, I hope it can help you.

Dangers of high myopia.

1.Vitreous, choroidal, and retinal degeneration due to structural abnormalities and nutritional disorders of the eye.

2.Macular degeneration atrophy due to axial lengthening, scleral elongation, biomechanical abnormalities, and posterior staphyloma.

3.Amblyopia and strabismus due to low visual acuity, dysfunction of accommodative divergence, etc.

Symptoms of high myopia.

1. Vision loss.

2. The rapid development of myopia: different from simple myopia, some eyes with high myopia continue to develop even after adulthood, so it is also called progressive myopia.

3. Proptosis of the eyeball: the eyes of high myopia are mostly axial, the eyeball is obviously elongated, the anterior chamber is deeper, the ciliary muscle is atrophied, and some people's eyeballs protrude outward.

4. Poor dark adaptation function: the pigment epithelial cells of the retina are diseased, which affects the photochemical reaction process of the optic cells.

5. Black shadow in front of the eyes: high myopia can cause vitreous degeneration, liquefaction, posterior vitreous detachment, etc.

Clinical manifestations of high myopia.

1.Decreased vision.

2.Myopia develops rapidly: Unlike simple myopia, some eyes with high myopia continue to develop even in adulthood, so it is also called progressive myopia.

3.Proptosis: The eyes of high myopia are mostly axial, the eyeball is significantly elongated, the anterior chamber is deeper, the ciliary muscle is atrophied, and some people's eyeballs protrude outward.

4.Poor dark adaptation: the pigment epithelial cells of the retina are diseased, which affects the photochemical reaction process of the optic cells.

5.Dark shadow in front of the eye: high myopia can cause vitreous degeneration, liquefaction, posterior vitreous detachment, etc.

High myopia**.

1. Surgery**.

1.Corneal surgery At present, excimer laser corneal refractive surgery is widely used, especially the application of femtosecond laser, which can be used to correct high myopia. As for the longer-term effects and the impact on eye tissue, it remains to be seen.

2.Anterior and posterior chamber intraocular lens implantation.

3.Lens and intraocular lens surgery.

4.Posterior scleral reinforcement The safety and efficacy of this type of reinforcement remain to be seen.

2. Others**.

1.Wear glasses, glasses and contact lenses.

2.Symptomatic retinal tears should be treated with laser photocoagulation, condensation, or scleral buckling.

3.Patients with suspected glaucoma, who have no progressive myopia and have a progressive visual field defect that suggests the need for glaucoma**.

4.Extrafoveal or parafoveal choroidal neovascularization, which can be laser photocoagulation** within a few days of fundus fluorescence.

You may also like:1How to swim with high myopia.

2.High myopia** method.

3.How to ** the method of ultra-high myopia.

4.**Home remedies for highly myopic eyes.

5.How to cure high myopia in children.

Genetic factors are the main cause of high myopia. The occurrence of high myopia in China is autosomal recessive inheritance, that is, both parents are highly myopic, and 100% of children are highly myopia; If one parent is highly myopic, 50% of the children are highly myopic; But there are also incomplete performances. In addition, environmental factors such as long-term nearsightedness are also a cause of myopia, but they do not play a major role in high myopia**.

Myopia is divided according to the degree, and the refractive error with a myopia degree greater than 600 degrees (400 degrees for children) is called high myopia. Because most of these myopic eyes have pathological changes in the eye, high myopia is equated with pathological myopia or degenerative myopia. The cause of high myopia is unknown.

The occurrence of pathological myopia is genetically related. The acquired environment plays an important role in the onset of myopia.

High myopia is a type of refractive error, which refers to myopia of more than 600 degrees, which is easy to cause a variety of eye complications, and the common ones are as follows:

Clause. 1. Retinal detachment. Patients with high myopia often have an axial growth, and the retina is stretched as the axial growth occurs, creating a weak area. Retinal detachment occurs when the eye is traumatized or when strenuous exercise is engaged;

Clause. 2. Macular neovascularization. After the retina in the macular area is weak, the new blood vessels from the choroid grow into the retina from the weak area, which will cause repeated spontaneous hemorrhage and leakage, resulting in yellow recurrent hemorrhage and macular edema, which will have a serious impact on vision.

Clause. 3. Macular splitting. Because the retina has good elasticity and poor elasticity of the inner layer during the stretching process of the eye axis extension of high myopia, the separation between the inner and outer layers occurs.