mattfink said:As long as the lab will do it, I don't think it's an issue. You could actually pick any pair of vintage frames and do the same.
I would just make sure they wrap a bit, even though a lot of vintage safety glasses looked pretty much like really stout Ray Bans. I wouldn't want tiny pieces of metal coming in from the sides, so I'd rather wear modern. And you want to make sure the frames aren't brittle, or they could break just when you want them to save your eyes. You could also do old welders goggles and have prescription lenses made; the lenses usually screwed out.