First of all, we must distinguish between true and false myopia
On the surface, false myopia behaves the same as true myopia, that is, distant vision is blurred and near vision is clear. But looking at the essence through the phenomenon, the difference between the two is obvious. The so-called pseudomyopia is caused by frequent incorrect use of the eyes, which causes the ciliary muscles to continue to contract and spasm without getting the rest they deserve, and the lens becomes thicker as a result. In this way, parallel light from the outside enters the eye, and after being refracted by the thickened lens chamber, the focus falls in front of the retina, and things in the distance are naturally unclear. During this period, there are no organic changes in the eyeballs. If you get proper rest and treatment, pay attention to eye hygiene, and use your eyes rationally, there is still hope of restoring normal vision. However, if the pseudomyopia is not corrected and treated in time, it will develop into true myopia over time. There are many methods to treat pseudomyopia, mainly relaxation and adjustment, such as applying cycloplegics to dilate pupils, acupuncture, physical therapy, improving the learning environment, paying attention to eye hygiene, and doing eye exercises carefully, etc.
If you suspect pseudomyopia, you can go to the hospital for an eye examination. The doctor will use mydriatic drops to dilate the pupil. After the cycloplegia, the eye will be checked and refracted. If there is no change in refraction, the pupil will be dilated at the same time. Afterwards, the visual acuity improved significantly or returned to normal, indicating that it was just pseudomyopia. If there is a corresponding change in myopia diopter after mydriasis and ciliary muscle refraction, but the visual acuity does not improve after mydriasis, but the visual acuity can be improved by adding the corresponding myopia diopter, this is true myopia.
Computerized optometry is for reference only and cannot be used to directly make prescriptions for glasses
The computerized optometry developed in the 1970s to this day belongs to the objective optometry method. The machines used for this kind of optometry are optical, An instrument that combines electronic and mechanical aspects, its principle is basically the same as that of retinal retinoscopy. In addition, infrared light sources and automatic fog vision devices are used to achieve the purpose of relaxing eyeball adjustment. Its operation is simple and fast, which is a great progress in optometry technology. However, various types of computer refractometers have certain errors. Although infrared light sources and automatic fog vision devices are used to relax the adjustment, the adjustment effect cannot be completely eliminated. In particular, teenagers have strong adjustment abilities, and simple computer refraction is often inaccurate. If it is necessary to use computer optometry, eye drops should also be used to dilate the eyes before anesthetizing the ciliary muscles. The errors in computer refraction results are mainly due to high myopia and poor astigmatism axis. Therefore, the computer optometry results can only be used for clinical reference and cannot be directly used as a prescription for glasses.
Wear glasses normally for a long time after wearing glasses
When you suffer from myopia and have been diagnosed as true myopia with a degree of more than 100 degrees, you should wear appropriate myopia glasses to correct it. Once you are equipped with glasses, you should wear them except when washing your face and sleeping, because after wearing suitable glasses, myopia patients are in a state of emmetropia, and the adjustment and convergence functions restore their natural relationship. Wearing glasses is not only to improve vision, but also to read and work at an appropriate distance, so that there is a normal coordination relationship between the adjustment and convergence functions of the eyes, and to avoid eye fatigue.
Wearing glasses correctly will not make them deeper
The development of myopia is not directly related to wearing glasses. Myopia patients wear suitable glasses and pay attention to eye hygiene, and the degree of myopia will stabilize at a certain level. However, if you think that everything will be fine if you wear glasses, and do not pay attention to eye hygiene, and continue to make your eyes tired for a long time, it will lead to vision loss and myopia deepening. In addition, wearing inappropriate glasses, such as: no or inaccurate refraction, or too large a prescription, will increase the burden on the eyes, causing vision loss and worsening of the prescription. Although some people with high myopia (more than 600 degrees) insist on wearing glasses, the degree will still deepen, accompanied by fundus changes, which is medically called pathological myopia. 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 Master Liu Hong of the Department of Ophthalmology, Second Affiliated Hospital of Nanjing Medical University. (He Songming)
The above is an article I found specifically for you. I have read it well. You should study it and go to the hospital if you think it is necessary.
Because optometry in the hospital requires mydriasis, which usually takes three hours, so if you plan to do so, go during the holidays (leave early when the hospital is just opening, usually when the hospital opens. You won’t be able to do it later, and some places will have queues) No.), I will be on vacation soon, so that it will not affect your study.
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How to wear glasses correctly
(1) Patients with refractive errors need to wear glasses after undergoing optometry: the degree of refraction and the final prescription Prescriptions for glasses often vary. This requires a lot of skill and experience, and the doctor or optometrist needs to comprehensively consider many factors such as the patient's age, refractive error, vision, strabismus, and the purpose of wearing glasses, and finally issue a prescription for glasses. The main purpose of wearing glasses is to improve vision, relieve symptoms, solve visual fatigue, diplopia and strabismus, and establish monovision in both eyes. Therefore, in principle, if you find refractive abnormalities, you should wear glasses, including contact lenses (contact lenses).
(2) It is not necessary to wear glasses or temporarily not to wear glasses in the following situations: ①Those with low degrees and asymptomatic, usually those with myopia, farsightedness and astigmatism within 50 degrees. ② Hyperopia in children or young people without any symptoms. ③Those who have diseases in the refractive system and photoreceptor system that affect vision, but there is hope for treatment. ④Those who cannot wear ordinary glasses due to professional reasons (actors, athletes, pilots, etc.), anisometropia, etc. can wear contact lenses (contact lenses).
(3) The effect after wearing glasses:
Generally, mild and moderate myopia can be corrected to normal vision, but high myopia or myopia exceeding 1000 degrees is often due to fundus Lesions, lens or vitreous opacities often cannot be satisfactorily corrected. The principle of wearing glasses for myopia is to correct the vision to the highest standard. The lower the degree of myopia, the better. That is, the lowest degree of myopia that corrects the best vision is the standard for wearing glasses. High myopia often cannot be completely corrected. If necessary, the degree obtained by examination can be reduced by 1/2 to make it suitable for reading and writing. All patients with myopia and astigmatism should wear glasses. If the astigmatism degree exceeds 300 degrees, it should be appropriately reduced without affecting the corrected vision.
Mild and moderate hyperopia can also be corrected to normal vision, but for hyperopia with high hyperopia or amblyopia, the corrected vision is often not satisfactory. All hyperopic eyes will be corrected based on the results of mydriasis refraction and reexamination. Especially when the hyperopic eye of a child has esotropia, if the prescription of glasses is not enough, the affected eye needs to use adjustment power to enhance the convergence force. Esotropia is difficult to correct, such as For patients with exotropia or exotropia, the degree can be appropriately reduced to reduce the degree of strabismus, but the corrected visual acuity cannot be lower than 0.7. The principle of glasses for hyperopia is to prescribe glasses according to the highest degree of correction for best vision; for those with astigmatism, full correction is also given to obtain the best vision.
After getting an accurate prescription for glasses, it is also important to choose the glasses frame that suits you correctly and scientifically. First of all, the optical requirements of the lens must be fully met, and the interpupillary distance, mounting distance, inclination, etc. must be fully considered. From an ophthalmological point of view, the optical center of the lens must be consistent with the center of the pupil, otherwise the lens will have a prism effect, which will interfere with visual function. After wearing the glasses, dizziness, dizziness, visual distortion, eye soreness, fatigue, etc. will occur. Secondly, according to your face shape, choose a frame with a style and color that suits you. Some people don't pay much attention to wearing glasses. They buy a pair casually in shops or vendors, or use other people's glasses to wear them indiscriminately. This is very inappropriate and will only aggravate eye fatigue and make their vision worse. Difference.
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How should teenagers wear glasses properly
If teenagers wear glasses inappropriately, it will not only damage their eyesight, but may also cause various Symptoms such as dizziness, headache, gastrointestinal discomfort, etc. An ophthalmologist at the Harbin Red Cross Youth Vision Rehabilitation Base said that after fitting young people with suitable glasses, only if they are worn properly can they truly protect and improve their vision.
According to reports, preschool children suffer from myopia, and the diopter is above moderate when checked. Some cases may be accompanied by varying degrees of exotropia. After wearing glasses for this type of myopia, they must wear glasses frequently and require Review once every six months. Teenagers with mild myopia can wear glasses when looking at distances and take them off when looking at near places; moderate or high myopia must wear glasses for a long time regardless of whether they look far or near.
Many parents think that "the degree of myopia will become deeper as you wear glasses." In fact, the degree of myopia will mainly depend on eye hygiene and has nothing to do with whether or not you wear glasses. Myopia will still deepen without wearing glasses, or even worse. quick. Patients with astigmatism, regardless of whether they are simple or mixed, must wear glasses regularly as long as they have conscious symptoms.
The "Youth Vision Healthy and Bright" project activity jointly launched by this newspaper and the Harbin store of Beijing Tongren Optometry and Optometry Center, which is the Harbin Red Cross Youth Vision Rehabilitation Base, will provide free vision examinations and retail services to young people by ophthalmologists. For pupil retinoscopy and optometry, treatment and glasses knowledge consultation, etc., the address is No. 332 Guogeli Street, Nangang District, Harbin (second floor of Beijing Tongren Optometry and Optometry), and the health consultation hotline is 53002997. (Life Daily)
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How to wear glasses with high myopia
Q: If people with high myopia (more than 600 degrees) wear contact lenses for a long time Or if they are often worn interchangeably with myopia glasses, will there be any adverse side effects? Will it lead to a deepening of the degree? Some people wear contact lenses with the same degree of vision much better than wearing myopia glasses. Why is this?
Nanning Xiaofei
Answer: For patients with high myopia, wearing contact lenses and glasses interchangeably will not cause adverse side effects to the eyes. However, wearing contact lenses for a long time may cause some eye discomfort due to lack of oxygen. 80% of the oxygen in the cornea comes from direct contact with the air. Red eyes and dryness caused by corneal hypoxia are common after wearing contact lenses. Some people will have a foreign body sensation, and a few people will have a foreign body sensation due to improper lens care or personal hygiene habits. Poor quality can cause corneal inflammation. The oxygen permeability of contact lenses put on the market must meet national safety standards. Therefore, as long as the lenses are worn and cleaned in strict accordance with the requirements of care procedures, it is still very safe to wear contact lenses.
Wearing appropriate glasses (contact lenses or glasses) will not worsen myopia. Wearing inappropriate glasses will cause varying degrees of damage to your eyes.
It can be said that optometry and glasses are actually a medical behavior to treat myopia, hyperopia, amblyopia and solve presbyopia. Before optometry, a doctor must conduct necessary eye examinations to rule out eye diseases. The complete refraction process includes three stages: 1. In the initial stage, the basic refraction of the eyes is obtained through retinoscopy or computer refraction, and the power of the original lenses is measured to understand the wearer's previous wearing of glasses. 2. The precise stage, that is, subjective refraction, makes subtle adjustments to the subjective feelings of the wearer through multiple steps such as precise measurement of astigmatism axis and degree, fog vision, red-green test, and binocular balance. These processes all require comprehensive glasses information. Finally, the doctor needs to make final and subtle adjustments based on experience and scientific judgment through trial fitting and the reaction of the wearer to prescribe the most suitable glasses prescription. After having a suitable prescription, you also need to have precise frame assembly to get the most suitable glasses.
Why is it clearer to wear contact lenses than glasses with the same degree? Simply put, this is a matter of the distance between the glasses and the eyes. That is to say, the lenses of frame glasses are at a certain distance from the eyes, causing the effective power of the lenses relative to the refractive system of the eye to become lower; while the lenses of contact lenses are worn directly on the cornea, and the distance between the glasses and the eyes is zero. The effective power of the relative eye refractive system is higher than that of glasses with the same power, so wearing contact lenses with the same power will make your vision clearer than wearing glasses. Deputy Chief Physician Liu Weimin, Director of the Optometry Center of Guangxi District People’s Hospital