The answer to this question should be explained in two parts. If someone's vision drops, he must go to the hospital to check whether his eyes belong to that kind of vision drop, pathological or true myopia. If it is true myopia, you must optometry and glasses. I made an evaluation before optometry. At present, most hospitals cooperate with private opticians. The cost of optometry is high, and one of the most common frame lenses is more expensive and cannot be bargained. But everyone has an innate trust in the hospital, so many people are willing to go to the hospital for optometry for the first time. Over time, they gradually feel that the hospital is not so good, so they still wear glasses in professional optical shops. In fact, you can go to the hospital for optometry first, then go to the optical shop for optometry, take the light or average value of the two optometries, and then try it on further to determine the prescription of optometry. Make sure that optometry glasses are best prescribed in the same store. Some glasses are processed elsewhere, and most hospitals also call them third-party processing. As long as it is processed on behalf of others, the product quality will be discounted. Therefore, optometry is a systematic problem, not a problem in hospitals or optical shops.