... , CR39 1.56 Progressive Short CR39 1.56/1.499 Single Vision,1.70 aspheric lens, 1.70 Titan lens, CR39 Lenticular lens, 1.61 High-index lens, 1.61 Hicyl ... round top bifocal/flat top bifocalMineral 1.523 Lens, CR39 sun lens, PC Polarized lensAbout us : Hongchen Optics Glasses Business .we are a leading manufacturer ...