Detailed Product Description Semi-finished lens(Optical lens)Index: 1.49, 1.56, 1.61Base: 2,4,6,8,10,12,14Center thickness; 3.00 to 10.00mm relying on different base and power.Coating: Convex side HMCSingle vision, 65mm, 70mm, 75mmBifocal(Round top 70/28mm, 70/24mm). Blend top(70/28mm, 70/24mm)Flat top (70/28m, 70/30mm).Progressive semi-finished, Diameter 75mm, short corridor 14mm, Regular ...