CR39 bifocal lens 1.all index lens 2.progressive , flat top ,round top.single vision ,sunglass lens 3.semi finished lens CR39 bifocal ... lensWe have all kinds of lens, All kinds of index lens.such as : ... single visin, progressive lens,flat top lens,round top, photochromic lens,Polarize lens,sunglass lens.And all kinds of RX lens.And all kinds ...