I need some new glasses, so I went to Zenni............However

I want bifocals with a polycarbonate lens. And Zenni does not do bifocals in Polycarbonate. And they say their polycarbonate lens are not OSHA approved. I tried to get what material they use so I could look up the specs. but I couldn't get that info from them.

So does anyone know of a good place to get bifocals in a material that is OSHA approved? Or at least material that comes close to being OSHA approved..

Dan