1.Index:1.499 2.Base color:Transparent Accurate and stable degree, transparent base color is easy to adapt;HC and HMC coating are available;Various fashionable coating colors and lens sizes are available;Use American Cobain plant equipment; with high speed, high efficiency, good quality, stable degree and human-centered soft-corridor design;Degree Range: 10.00-20.00/4.00-8.00; 1.49 RX Lens