1.499 Cr39 lens, 1.56, 1.60,1.67 optical lens, Polycarbonate lens, photochromic lens, Mineral lens, Cr39 Polarized ... lens: 1.499 Cr39 lens, 1.56, 1.60,1.67 optical lens, Polycarbonate lens, photochromic lens, Mineral lens, sunglasses lens ... relationship 1.499 Cr39 lens, 1.56, 1.60,1.67 optical lens, Polycarbonate lens, photo chromic lens, Mineral lens, Cr39 ...