... 1.67 Semi-finished lens 2.Diameter: 60m5,70mm,75mm 3.Well designed base curve Semi-finished lens(Optical lens)Index: 1.49, 1 ... .56, 1.61Base: 2,4,6,8,10,12,14Center thickness; 3.00 to ... coating machines.Our prescription lenses:single vision,bifocal lens,progressive lens,polarized lens,photochromic lens,PC lens,free form…To be ready forTomorrow’s demands ...