... 1.50 1.56 1.60 and 1.67 Semi-finished lens 2.Diameter: 60m5,70mm,75mm 3. ... Well designed base curve Semi-finished lens(Optical lens)Index: 1.49, 1. ... /24mm)Flat top: (70/28m, 70/30mm).Progressive semi-finished:Diameter 75mm, short corridor 14mm, Regular corridor 17mm ... .polarized semi-finished:diameter 70mm and 75mm color,grey,brown, ...