I wanna buy prescription glasses at the online stores for saving money, but I don’t know how to choose correct eyeglasses frames that can fit me well at the online stores. Could you please give me some suggestions? Thanks!

To choose the eyeglasses frame that will fit you well, the most important point is total width of the new eyeglasses frame can match the total width of your existing frame. By selecting frame with similar measurement and it will fit you well.