... machine: Lens edger, groover, and driller Optical lens:Optical lens: 1.499 Cr39 lens, 1.56, 1.60,1.67 optical lens, Polycarbonate lens, photochromic lens, Mineral lens, sunglasses lens, Cr39 Polarized lens. Glass ... or mail and hope to build a successful cooperation relationship 1.56 / 1.61 photochromic lens (Single vision . Round top. Flat top . Invisible. progressive )