If you want prescription lenses, get Transitions Xtra Active(they can be made as just sunglasses..no Rx also). The other stuff I haven't a clue about. For riding in varying conditions and into dusk, they can't be beat. Carrying multiple lenses/glasses is idiotic IMHO.
The only time I carry multiple pairs is for fishing. Have to have polarized lenses for fishing. But at dusk you have to switch back to regular or photochromic lenses.
I'd imagine the 'generic' photochromic lenses work well enough today although they used to be junk.
Last edited by bigbadwullf; 05-11-11 at 08:12 AM.