Before purchasing eyeglasses, we need to select frames. We need to choose a pair of eyeglasses frames that can hold a prescription. Lower quality eyeglasses frames are not designed to hold a prescription lens and are called non-Rxable. Rxable eyeglasses are eyeglasses frames that can accept a prescription lens. However, there are some sunglasses frames with an excessive wrap design can only accommodate prescription lenses up to a power of approximately +/-5.00 sphere. You can not put a prescription is sunglasses with a shield design. Some sunglasses manufacturer have facilities to make prescription lenses for their own frames, like Oakley, Bolle, and Maui Jim. Hope this helpful.