I recently purchased some sunglasses with a wrap around frame and prescription inserts. I am very disapointed in the results so I thought I would report what I think about them.
If you are not familiar with this style, it is like a regular set of sunglasses (no prescription) with a very small set if prescription lens mounted on a clip behind the sunglass lens. I tried this approach because I could not find any brand of wraparound sunglasses that could handle my prescription without going this route. Normally I wear tri-focal lens but had this set made up as bi-focal since I don't need the tri-focal for cycling.
The glasses are just fine for straight ahead viewing and they protect the eyes well from wind in all directions. However, the prescription lens are very small (compared to normal glasses) and it is impossible to see in any direction (up/down/sidways) other than straight ahead without excessive head and neck movement. Off center views create split vision or no vision at all. In my normal glasses (even with clip on sunglasses) I can look sideways for traffic with little trouble and can even turn my head enough to look over my shoulder for traffic. That is impossible with the prescription insert glasses unless you can turn you head like an owl.
No mention of the brand I got since my comments are targeted at the style...not the manufactures. The glasses are made well and perform well ...if all you need is straight ahead vision. If anyone is considering this style, I would recommend that you try on a set with a uncut prescription insert installed so you can judge for yourself if you can adapt to the limitations. I should also note that this manufacturer makes similar glasses for multiple sports and the set I got was specifically targeted at cyclist.