distortion-free image with edge-to-edge sharpness.Product AccessoriesReading caps:162301 Reading cap ring for fitting lens with an individual power (not shown).16230 Frosted lens16233 Reading cap 3.0 dpt16234

like a conventional lens, but does not consist of a smooth, curved surface - but different concentric ring zones, which have different optical refractive properties. The lens is therefore significantly thinner