You can get glasses online. If you don't know your diopter, you might as well have a check-up at a regular eye clinic. It's not much money, and it will be done within 21 yuan. If you don't understand the optometry form, you can send it to an online shop by scanning and faxing. In short, there should be no big problem in successfully preparing a suitable pair of glasses. Even with the optometry fee, the cost of online glasses, such as OJO glasses network, is far more than.