As I generally wear contacts I was looking for glasses with inserts this spring. I got the RP Ketyum and am pretty happy with them. The inserts do sit behind the regular lenses and that takes a little getting used to. It's odd up close and at the edges but looking down the road through the center is just fine. The RP optics are the best I've ever seen. I bought from
http://www.heavyglare.com/. Fabulous folks to deal with.