CPC Main Group G02B 3/00 Simple or compound lenses 7 direct subcodes Child Classifications Navigate with arrow keys, Enter to open G02B 2003/0093 G02B 3/0006 G02B 3/0081 G02B 3/0087 G02B 3/02 with non-spherical faces (G02B3/10 takes precedence) G02B 3/10 Bifocal lenses; Multifocal lenses G02B 3/12 Fluid-filled or evacuated lenses