SETO is specialized in manufacturing spheric and aspheric optical lens. Products include CR39 1.499, 1.56, 1.61 and 1.67 refractive index of various types of myopia and reading optical lens.Single vision, round bifocal, flat bifocal, invisible bifocal, progressive, tinted, photochromic , trivex and freeform lens are available.In addition, SETO supplies optical lens with HC and HMC treatment.Besides finished optical lens, SETO also manufactures semi-finished blanks and supplies service of Rx lens. Besides stock lens, we also make free form lens with equipment of Gerber Coburn Optical, Inc. with IOT Lens Design Software.The details are as follows: Index: 1.499, 1.56, 1.558, 1.586, 1.61, 1.67, 1.74 Power range: -10.00 to +8.00 Cylinder: -4.00 to +4.00 Add: +0.50 to +3.50 Diameter: 60 to 75 mm.