I wear "no line" lenses for daily use but due to the way they are ground they are not good for shooting. For shooting I have set of Ray Ban shooting glass frames with face hardened lenses ground to my distance correction except for a tiny bifocal grind at the very bottom (which you never see when looking through the scope). They also have the automatic dimming feature (brown).
They are big, strong and provide far more eye protection than day to day glasses. IMHO only a fool shoots w/o shooting glasses.