On the surface, pseudomyopia and true myopia have the same performance, that is, they are blurred at a distance and clear at a close distance. But looking at the essence through the phenomenon, the difference between the two is obvious. The so-called pseudomyopia is due to frequent incorrect use of eyes, continuous contraction and spasm of ciliary muscles, lack of proper rest and thickening of crystals. In this way, the parallel light from the outside enters the eyes, and after the thickened lens chamber is bent, the focus falls in front of the retina, and it is naturally unclear to see things in the distance. During this period, there was no organic change in the eyeball. If you can take proper rest and treatment, pay attention to eye hygiene and use your eyes reasonably, there is still hope to restore your normal vision. However, if pseudomyopia is not corrected and treated in time, it will develop into true myopia over time. There are many treatments for pseudomyopia, mainly relaxation and adjustment, such as using mydriatic agents, acupuncture and physiotherapy, improving the learning environment, paying attention to eye hygiene and doing eye exercises seriously.
If you suspect pseudomyopia, you can go to the hospital for eye examination. The doctor will dilate the pupil with mydriatic liquid, and then check the optometry after the ciliary muscle paralysis. If the diopter has not changed, the vision has been obviously improved or returned to normal after mydriasis, indicating that it is only pseudomyopia. If the myopic diopter changes after mydriasis paralysis ciliary muscle optometry, the vision will not be improved after mydriasis, but the vision can be improved by increasing the corresponding myopic diopter, which is true myopia.
Computer optometry is for reference only, and direct optometry is not allowed.
Computer optometry developed in 1970s belongs to objective optometry. This optometry machine is a combination of light, electricity and machine, and its principle is basically the same as that of optometry. In addition, infrared light source and automatic atomization device are used to relax eyeball accommodation. Its operation is simple and quick, and it is a great progress in optometry technology. However, all kinds of computer optometry instruments have certain errors. Although infrared light source and automatic fog vision device are used to relax the adjustment, it can not completely eliminate the adjustment influence, especially for teenagers, whose adjustment ability is very strong, and it is often inaccurate to simply use computer optometry. If computer optometry is really needed, the ciliary muscles should also be anesthetized with eye drops before optometry. The errors of computer optometry results are mainly high myopia and astigmatism axis difference. Therefore, the results of computer optometry can only be used as a clinical reference, and can not be directly used as a prescription for glasses.
Wear glasses normally for a long time after fitting glasses.
When you have myopia and have been diagnosed as true myopia, and the degree is above 100 degrees, you should wear appropriate myopia glasses to correct it. Once glasses are fitted, you should wear them except for washing your face and sleeping, because myopia patients are in a state of looking straight at their eyes after wearing appropriate glasses, and the natural relationship between adjustment and convergence is restored. Wearing glasses is not only for improving eyesight, but also for reading and working at a proper distance, so that there is a normal coordination between eye adjustment and convergence functions and eye fatigue can be avoided.
Wearing glasses correctly will not get deeper and deeper.
The development of myopia is not directly related to wearing glasses. Myopia patients wear appropriate glasses and pay attention to eye hygiene, and the degree of myopia will stabilize at a certain level. However, if you think that wearing glasses will be all right, but you don't pay attention to eye hygiene at ordinary times, and you are tired of using your eyes for a long time, it will lead to decreased vision and deepened myopia. In addition, wearing inappropriate glasses, such as no optometry or inaccurate optometry, will increase the burden on the eyes, reduce vision and deepen the degree. Some people with high myopia (above 600 degrees) insist on wearing glasses, but the degree will still deepen with the change of fundus, which is called pathological myopia in medicine. This deepening of myopia is related to the degree of myopia and family, and has nothing to do with wearing glasses.
Director Zhang Xiaojun and Director Liu Hong of the Department of Ophthalmology, the Second Affiliated Hospital of Nanjing Medical University. (He Songming)
The above is an article I specially found for you. I read very well. You should study it and go to the hospital if you feel it necessary. Because the hospital optometry needs mydriasis, the time is usually three hours, so I choose to have a holiday if I have this plan (when I go, I usually choose to leave early as soon as the hospital opens, but it will not work if it is late, and some places will be numbered), and I will have a holiday immediately, which will not affect my study.
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How to wear glasses correctly
(1) Patients with ametropia need glasses after experiencing light: the degree of optometry is often different from that of the last glasses. There are strong skills and experience in this, and doctors or optometrists need to comprehensively consider the patient's age, ametropia, vision, strabismus and the purpose of glasses, and finally prescribe glasses. Glasses are mainly used to improve vision, relieve symptoms, solve vision fatigue, diplopia and strabismus, and establish binocular monocular vision. So in principle, if you find refractive abnormality, you should wear glasses, including contact lenses.
(2) Don't wear glasses or temporarily don't wear glasses in the following situations: ① The degree is low and asymptomatic, and the myopia, hyperopia and astigmatism are generally within 50 degrees. ② Hyperopia in children or adolescents without any symptoms. ③ There are diseases in refractive system and photosensitive system, which affect vision, but there is hope for treatment. ④ Those who cannot wear ordinary glasses due to professional reasons (actors, athletes, pilots, etc.). ) and anisometropia can wear contact lenses (contact lenses).
(3) The effect after wearing glasses:
Generally, mild or moderate myopia can be corrected to normal vision, but high myopia or myopia above 1000 degrees can not be satisfactorily corrected because of fundus lesions and lens or vitreous opacity. The principle of myopia optician is to correct the vision to the highest standard, and the lower the myopia, the better, that is, the lowest degree to correct the best vision is the optician's standard. High myopia is often not completely corrected. If necessary, we can reduce 1/2 according to the degree obtained in the exam to make it suitable for reading and writing. All myopic astigmatism parts should be equipped with glasses. If the astigmatism exceeds 300 degrees, it should be reduced appropriately without affecting the corrected vision.
Mild and moderate hyperopia can also be corrected to normal vision, but hyperopia with high hyperopia or amblyopia is often dissatisfied with the corrected vision. According to the results of mydriasis optometry and reexamination, hyperopia has been completely corrected. Especially when children's hyperopia appears esotropia, if the glasses are not enough, the affected eyes need to use adjustment force to enhance the cohesion, and esotropia is difficult to correct. If accompanied by esotropia or exotropia, the degree can be appropriately reduced to reduce the degree of strabismus, but the corrected vision should not be less than 0.7. The principle of hyperopia glasses is to match glasses according to the highest degree of correcting the best vision; For people with astigmatism, all correction is also to get the best vision.
After getting an accurate prescription, it is also important to choose the glasses frame that suits you correctly and scientifically. First of all, we should fully meet the optical requirements of the lens, and fully consider the pupil distance, installation distance and inclination. From the point of view of ophthalmology, the optical center of the lens must be consistent with the pupil center, otherwise the lens will produce prism effect and interfere with the visual function, and dizziness, dizziness, distortion of vision, sore eyes and fatigue will occur after wearing the lens. Secondly, according to your face, choose the frame that suits your style and color. Some people pay little attention to wearing glasses. They just buy a pair at a store or a vendor, or wear other people's glasses indiscriminately. This is very inappropriate, and the result can only be increased eye fatigue and poor vision.
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How do teenagers wear glasses reasonably?
If teenagers don't wear glasses correctly, it will not only damage their eyesight, but also cause various diseases, such as dizziness, headache and gastrointestinal discomfort. An ophthalmologist at Harbin Red Cross Youth Vision Rehabilitation Base said that only by wearing appropriate glasses can teenagers really protect and improve their vision.
According to reports, preschool children suffer from myopia, the diopter is above moderate, and some cases may be accompanied by different degrees of exotropia. After this kind of myopia is equipped with glasses, it is necessary to wear glasses frequently and review it once every six months. Teenagers with mild myopia can watch it.
Wear a mirror when you are far away, and take it off when you are near; Moderate and high myopia, whether hyperopia or myopia, must wear glasses for a long time. Many parents think that "the degree of glasses will get deeper and deeper". In fact, the deepening of myopia mainly depends on eye hygiene and has nothing to do with wearing glasses. Without glasses, the degree of myopia will deepen even faster. Astigmatism patients, whether simple or mixed, must always wear glasses as long as they have conscious symptoms.
The project "Healthy and Bright Vision for Teenagers" jointly launched by our newspaper and Harbin Branch of Beijing Tongren Optometry and Glasses Center, namely Harbin Red Cross Youth Vision Rehabilitation Base, will provide free vision examination, mydriasis optometry, treatment and glasses knowledge consultation for teenagers by ophthalmologists. The address is No.332, Gogol Street, nangang district, Harbin (the second floor of Beijing Tongren Optometry), and the health consultation hotline is 53002997. (Al-Hayat)
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How to wear glasses for high myopia?
Q: Will people with high myopia (above 600 degrees) have adverse side effects if they wear contact lenses for a long time or often exchange them with myopia glasses? Will it lead to a deeper degree? Some people wear contact lenses with the same degree, and they can see more clearly than people with myopia. Why?
Nanning Xiao Fei
A: Patients with high myopia wear contact lenses and frame glasses alternately, which will not bring adverse side effects to their eyes. But wearing contact lenses for a long time may cause some eye discomfort due to lack of oxygen. 80% oxygen in cornea comes from direct contact and absorption with air. After wearing contact lenses, redness and dryness caused by corneal hypoxia are more common, some people will feel foreign body sensation, and a few people will cause corneal inflammation due to improper lens care or poor personal hygiene habits. The oxygen permeability of contact lenses on the market needs to meet the national safety standards, so it is safe to wear and clean contact lenses in strict accordance with the requirements of nursing procedures.
Wearing appropriate glasses (contact lenses or frame glasses) will not cause myopia to deepen. If you wear inappropriate glasses, it will bring different degrees of damage to your eyes.
It can be said that optometry is actually a medical behavior to treat myopia, hyperopia, amblyopia and presbyopia. Before optometry, doctors should carry out necessary eye examinations to rule out eye diseases. The complete optometry process includes three stages: 1. In the initial stage, the basic situation of eye refraction is obtained through optometry or computer optometry, and the original lens power is measured to understand the previous wearing situation of the lens wearer. 2. In the precise stage, subjective optometry, the subjective feeling of the wearer is finely adjusted by accurately measuring the astigmatism axis and degree, fog vision, red and green test, binocular balance and other steps. All these processes require comprehensive glasses information. Finally, doctors need to make the most suitable prescription of glasses according to their own experience and scientific judgment, try them on, and make the final fine-tuning according to the wearer's reaction. With the right prescription, you need accurate frame assembly to get the most suitable glasses.
Why is it clearer to wear contact lenses at the same degree than to wear frame glasses? Simply put, this is the distance between glasses and eyes. That is to say, the lens of frame glasses has a certain distance from the eye, which leads to the lower effectiveness of the lens relative to the refractive system of the eye; Contact lenses are worn directly on the cornea, and the distance between glasses and eyes is zero, so its effective degree relative to the refractive system of eyes is higher than that of frame glasses with the same degree, so wearing contact lenses with the same degree will be clearer than that of frame glasses. Liu Weimin, deputy chief physician, director of optometry center of Guangxi People's Hospital.