Exclusive Digital Round Segmented Bifocal. Segments are available in 22mm, 28mm, and 35mm. This Digital Bifocal is available in over 50 lens materials, enabling you to offer greater material availability to the Segmented Bifocal patients. The add power is Digitally fabricated on the inside lens surface, creating superior optics while eliminating the front "ledge" present in all conventional segmented bifocals. With two smooth lens surfaces, AR performance is greatly increased.