Well… even with a plethora of vowels and consonants, sophie84 didn't receive a cogent answer… actually no answer at all, producing a certain ambage...
If you could find a pair of pre-1999 Bausch & Lomb Ray Ban sunglasses in a G-15 ground glass lens, you'd be in great shape, eye protection wise. (In the interest of disclosure, unlike Chris' Indian website, I do buy and sell ancient Bausch & Lomb Ray Bans on E-bay).
The current owner of Ray Ban is an Italian conglomerate called Luxottica and it's the opinion of Bausch & Lomb aficionados that the newer lenses don't match up to the previous quality.
The most popular model is the Wayfarer[i, but, of course, my personal favorite is the [i]Aviator] in the 58mm lens.
In my opinion, avoid any polarized lens and while the quality of plastic lenses has greatly improved they still don't match that of ground mineral glass lenses for eye protection...