Detailed Product Description CR-39 , 1.56 Photochromic Resin Optical Lens1) Finished lenses power range:70mm SPH(-0.00 to -8.00)/CYL(-0.00 to -2.00)65mm SPH(+0.00 to +8.00)/CYL(-0.00 to -2.00)2) Semi-finished lensesBASE: 2.00, 4.00, 6.00, 8.003) Available color: grey, brown, pink, purple, blue, orange, green 7 colors