good idea / bad idea - buying oakley latch glasses and getting progressive lenses

[mattkime]

I do a good portion of my cycling in the dark but its still wise to wear glasses to protect my eyes. I really like the Oakley Latch glasses but they don't come with my preferred lenses. I'd like a lens that goes from pretty much clear to medium level of protection. I have lenses like that on a $40 pair of glasses but they get scratched pretty easily.

Can I get those lenses made at Lenscrafters or similar? Would it cost me an arm or leg?

CLARIFICATION - I meant transition