I had photochromic Flak Jackets, and I liked them so much I got a second pair when my prescription changed. Both got stolen from my car, and since then I've had Optilabs Rascal - they are nearly as good and a lot cheaper.
My prescription has changed again, if I can get a good deal when buying sunglasses and regular ones I'll be going back to Oakley, but I haven't had a chance to go try some on yet.
My local optician stocks Oakley, so I'm just going into the branch. For the Optilabs, they will send you unglazed ones to try on if you want, and for the measurements, you either get your optician to do it or try to do the pd yourself (this was a few years ago, there might be clever online ways of doing it now!)