Single Vision Glass Lenses 1.53Single Vision Glass Lenses (1. 53) provide the hands down best performance out of all of our lenses, if you have a normal strength prescription. You should consider single vision glass lenses if you have full frame eyeglasses, as they can not be fitted into semi rimless or drill mount eyeglass frames. But if you do have full frames and worry about scratched lenses, consider glass lenses as they are very resistant to damage from grit or other materials