Semi-Finished – SOMO 1.56 Spherical-SV Base Curves: 0.50, 2.00, 4.00, 6.00, 8.00 SOMO Spherical 1.56 Hardcoat Mid-IndexImpact Resistant Cushion CoatHard Coat Specifications Spherical DesignMaterial NK-551.56 Refractive Index1.28 Specific Gravity38 Abbe Value100% UV ProtectionScratch-Resistant Hardcoat