How much is Hangzhou OK mirror?

The price of different OK glasses is different, generally around 5000 ~ 1 10,000 yuan. My child has OK glasses at different prices in Zhijiang Hospital of Zhejiang Eye Hospital, which are the same as glasses. I didn't expect optometry to be so careful. It's absolutely professional. OK glasses belong to regular medical devices? It must be worn under the professional guidance of a doctor. In fact, ordinary optical shops are not legally qualified in China, so you must go to a regular hospital or a regular eye hospital!