... ,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 ... Our prescription lenses:single vision,bifocal lens,progressive lens,polarized lens,photochromic lens,PC lens,free form…To be ready ... forTomorrow’s demands,Rissee Rx lab has innovative lens products and world-class optometric solutions that ...