I built a nice set of glasses back in 2008; I'd have to look through my cd-roms to find it, if you like.
Basically, I designed them off a "Lenscrafters" add.
One thing you will like when designing glasses, is that you can finally use that old Blender tutorial on refractive glass lenses,
as it was one of Blender's first features (back to 2.25).