... designed base curve Semi-finished lens(Optical lens)Index: 1.49, 1.56, 1.61Base: 2,4,6,8,10,12,14Center ... HMCSingle vision: 65mm, 70mm, 75mmBifocal:(Round top 70/28mm, 70/24mm). Blend top(70/28mm, 70/24mm)Flat top: (70/28m, 70/30mm).Progressive ... machines(Schneider/Loh),and leybold coating machines.Our prescription lenses:single vision,bifocal lens,progressive lens,polarized lens,photochromic lens,PC ...