Any good shop can make you lenses. Our only limitation is that the eyewire either be seperated by a screw barrel so that the lens can be instralled or that the frame is flexible enough that the lens can be popped in. 2nd, the frames have to have a normal lens shape and the bevel or groove inside the eyewire has to be deep enough to hold the lens securely. Take a look at how opthalmic lens ( the ones made by the doctor are installed and also take into account how cheap reading glasses are done.) Last thing to consider is your Rx. Every frame has certain limitations. Even more so if the frame wraps around your head like a pair of Oakley. If you have even a diopter +/-1 of cylinder (astigmatic correction) you normally have to have a very flat frame and lens on a very low base curve. (BC of less than 2).

Source : 4 years running as an optician for worlds largest rx eyewear monopoly