Abstract: optometry is divided into conventional optometry and medical optometry, and their effects are very different. Ophthalmologists said that at present, many patients who need glasses have not received standardized medical optometry, which is not conducive to delaying the progress of juvenile myopia.
with the advent of summer, the peak of optometry and glasses has come again. The optometry and glasses Center of ophthalmic professional medical institutions began to be overcrowded, and the business of the glasses business was becoming more and more popular.
optometry are divided into conventional optometry and medical optometry, and their effects are very different. Ophthalmologists said that at present, many patients who need glasses have not received standardized medical optometry, which is not conducive to delaying the progress of juvenile myopia.
inaccurate optometry results in aggravation of the disease.
Wang Kai, deputy chief ophthalmologist of Peking University People’s Hospital, said that patients with ametropia, including myopia, hyperopia and astigmatism, are the largest group faced by ophthalmology. However, many patients who need to wear glasses have not received standardized medical optometry. The necessity of
medical optometry is reflected in three points:
1 The accuracy of standardized medical optometry is higher than that of ordinary optometry, which can effectively ensure the comfort and degree accuracy of lenses. The latter is particularly important.
2. Standardized medical optometry, especially for myopia, can slow down the progress of juvenile myopia to the greatest extent.
3. Standardized medical optometry is particularly important for children with oblique amblyopia. Inaccurate degree will aggravate the condition.
so what does medical optometry specifically mean? Guo Chungang, chief ophthalmologist of Beijing You’an Hospital Affiliated to Capital Medical University, said that medical optometry refers to eliminating ophthalmic diseases first, and then optometry. By formulating personalized prescriptions, patients can not only see clearly, but also continue to use glasses without any discomfort. After medical optometry, the diopter of glasses is more stable.
medical optometry more considers the durability of wearing glasses.
then, what is the difference between medical optometry and conventional optometry? Guo Chungang said that the purpose of routine optometry is only to let ametropic people see the object. The operation methods and steps are relatively simple, that is, subjective inserting films are carried out according to the results of computer optometry or optometry, and the inspection items are only 1 / 5 of the medical optometry items. In other words, medical optometry is twice as detailed as conventional optometry. The ordinary glasses line is routine optometry.
medical optometry steps are rigorous. Its purpose is not only to make patients see objects clearly, but also to coordinate the use of eyes and glasses, so that they can wear glasses comfortably and for a long time, which is longer than conventional optometry; And it can treat some possible eye diseases, such as visual fatigue, esotropia or exotropia.
choose optometry according to age
there are two methods of medical optometry. One is obvious optometry, which does not need to dilate the pupils during optometry. At present, it is recognized that the most accurate method is comprehensive optometry, which is suitable for people over 40 years old.
but for children under the age of 10, it is easy to make errors in the examination of hyperopia, astigmatism and pseudomyopia. Therefore, the second optometry method, mydriatic optometry, should be adopted, that is, mydriatic drugs should be used to dilate the pupils until the light reflection disappears completely before optometry, and then optometry.
mydriatic optometry can first eliminate pseudomyopia and avoid matching pseudomyopia when matching glasses, resulting in too deep degree of matching glasses. Secondly, it can avoid the optometry error caused by the strong eye adjustment ability of teenagers. Third, the degree of refraction and the position of astigmatism axis after mydriasis will be more accurate, especially for amblyopia, low intelligence Patients with poor coordination (mostly children).
The direct purpose of mydriatic optometry is to fully relax the ciliary muscle through drugs, in a completely unregulated state, so as to objectively and accurately test the diopter. In addition, whether the adjustment and relaxation is sufficient can be indirectly obtained from whether the pupil dilation is sufficient. If the relaxation is not enough, the ciliary muscle still contracts during optometry, which will affect the accuracy of optometry. When the time for mydriasis to work passes, the pupil will return to its original state, and the contraction of ciliary muscle will also return to its original state, without damage to the eyes. Is
mobile phone optometry reliable?
it was reported not long ago that the e-commerce platform “necessary mall” launched its self-developed “mobile optometry technology”, which is expected to realize the online purchase of glasses. According to the publicity article, users can self-help optometry without going to the glasses store, and then bypass the offline glasses store to realize the closed loop of online glasses purchase. Then, the “necessary mall” changed its mouth and said that the technology is not optometry, but eyeglasses optometry, which can only read the data of users wearing lenses.
open the “necessary” app and take photos of the lens in front of the mirror as required. All glasses data such as power, astigmatism, axial position and pupil distance can be read, and then an optometry sheet can be generated. At the same time, it claims that its “accuracy is as high as 95%” and “the technology is currently applying for a patent”.
in this regard, industry insiders believe that this is a typical marketing gimmick and oolong event.
at the same time, for the technology of mobile phone optometry, ophthalmologists such as Beijing Tongren Hospital Affiliated to Capital Medical University and the Third Hospital of Peking University said that this technology exists in theory, but there is still a distance from practical operation. In terms of optometry accuracy, the current industry requirements are degrees ≤ 25 degrees, pupil distance ≤ 1mm, astigmatism ≤ 125 degrees, and axial position ≤ 1 degree. At present, Tongren Hospital does not have this technology, which requires more cases to prove its reliability and stability.
are all misunderstandings about wearing glasses. Experts from
say that people often have the following misunderstandings when wearing glasses. Misunderstanding of
: it is better to match the glasses with a lower degree.
generally, glasses for myopia are prescribed with the minimum degree that can see the best vision. Assuming that wearing 300 degrees can see 1.0, wearing 275 degrees can see 1.0, and wearing 250 degrees can only see 0.8, it should be matched according to 275 degrees. If the number of degrees is less, you can’t see clearly in the most relaxed state of your eyes, which will make your eyes easily tiredLao, the image on the retina is not clear enough.
therefore, if the degree is lower, myopia will develop faster. Similarly, the degree can not be matched with depth. If the eyes are matched with depth, they need more adjustment when looking close, which will also accelerate the development of myopia.
misunderstanding 2. The more glasses they wear, the more they grow.
many parents are especially reluctant to wear glasses for their children when they first find that their children are short-sighted. They think that as long as they wear glasses, they can no longer take them off, and they will wear more and more glasses. In fact, in the case of correct glasses, whether the child’s myopia is deepened has little to do with the glasses themselves, but caused by the change of the refractive state of the eyes themselves. As long as the factors leading to myopia are still there, such as lack of outdoor activities and excessive burden of using eyes every day, the degree of myopia will continue to deepen, which has little to do with wearing glasses.
misunderstanding three wearing glasses will lead to eye deformation
with the development of myopia, the anterior and posterior diameter of the eye will become longer. When the average degree increases by 300 degrees, the corresponding eye axis length will increase by 1 mm. Therefore, people with high myopia, especially those with more than 1000 degrees, will have a much longer eye axis than ordinary people, which may be manifested as exophthalmos. Misunderstanding of
four glasses do not need to wear
at present, the mainstream view is that glasses need to be worn all the time, so as to obtain better visual quality. Only when the degree of myopia is less than 200 degrees and the near sightedness is not affected, you can consider wearing glasses when looking far and not when looking near. However, if the degree of myopia is deep, or combined with astigmatism, you need to wear glasses all the time.
myopia within 200 degrees is the golden period for correction.
experts say that the summer vacation is the peak of glasses matching, but for some teenagers, it is also a blind area for vision protection. The main reason is that the children don’t give their eyes a good rest, make up classes and homework, and all kinds of study classes increase the burden on their eyes; Unrestrained watching TV and playing computer worsen your eyesight. Moreover, 80% of children with high myopia suffer from the word “etc” of their parents. The diopter of
is generally no more than 200 degrees. This period is the golden period of correction. Using corneal plastic surgery, it is very easy to control myopia. After children are fitted with corneal plastic glasses, they can wear them at night, take off the glasses during the day, and sleep to restore clear normal vision, avoiding the troubles caused by many frame glasses.
outdoor activities may prevent myopia
in recent years, studies have found that outdoor activities may prevent myopia. So, why can you prevent myopia by staying outdoors? You Yuxia said that this is because the light intensity of the sun is much higher than that of indoor light, and the pupil will shrink in strong light, It increases the depth of field of the eye (generally speaking, the range of residual light of glasses) and increases the secretion of dopamine. Dopamine itself can also prevent myopia.
research shows that staying outdoors for two hours a day or 10 hours a week can play a better role in preventing myopia.