1.499 bifocal lens 1.Round top/flat top 2.Finished and ... customers a long list of products and services: - Optical Lens in all index 1.499, 1.56, 1.60, ... .523, 1.70 - Full Comprehensive range of Rx prescription lens in all index and material (Mineral, Polycarbonate, Transition and ... Situ Town, Dan yang, Jiangsu, China Main features1.499 Bifocal Lens Refraction Index: Nd=1.5 Abbe value: 591)Diamter: ...