In reply to Captain Gear:
What are you going to use them for? I had a pair of Adidas evil eye with haed band thing with rx inserts and they were pants. I bought them for a desert marathon and ran/trained a lot in them and they kept steaming up.
The soft surround with the air vents in them are really not good if you are doing anything other than lounging about, my opinion of course.It is all to do with the shape of the insert and the shape of the glasses, being curved it Isn't really a smart idea, just a bit of a gimic. If you want to, best to buy some Oakleys that you can have made up with different lenses and your rx rather than an insert, not cheap but a better option.
I ended up using my military issue ESS Advancer sunglasses with their rx insert and they were the dogs nads. Why I forked out for the Adidas ones is beyond me.