In the United States glasses usa, myopia sunglasses need an optometry prescription from a doctor. I used to wear myopia glasses. Most of them were measured in the glasses shop, and the degree measured in the glasses shop was high and low, so I went to the ophthalmic optometry.

In the United States glasses usa, I asked some opticians. Generally, they need to make an appointment with a doctor separately. For example, the Optical department of the supermarket can make an appointment for optometry, and the opticians can also make an appointment for optometry. The waiter told me that the optometry prescription in China could be used.

Hang up the number of the ophthalmology clinic and tell the doctor to wear glasses for optometry, and drop the mydriatic solution. It takes more than one hour before and after dropping the mydriatic solution, plus other visual inspection procedures, about two hours. However, it takes some time for the pupils to shrink after dilation, so it may take two or three hours to recover afterwards. Before the pupils recover, it may be difficult to see small words in close range, which will affect learning. So it is probably appropriate to arrange for an afternoon of optometry. It is better to call a friend to accompany you, because you should close your eyes after dropping the liquid medicine. Finally, the doctor will write a medical record for you and issue an optometry sheet (on which the myopia degree, astigmatism degree, astigmatism axis number and pupil distance of the left and right eyes are written) for the glasses shop to use.