Semi-Finished – SOMO 1.56 Aspheric-SV Base Curves: 0.50, 2.00, 4.00, 6.00, 8.00 SOMO Aspheric 1.56 Hardcoat Mid-IndexImpact Resistant Cushion CoatHardcoat Specifications Aspheric DesignMaterial NK-551.56 Refractive Index1.28 Specific Gravity38 Abbe Value100% UV Protection at 380nmScratch-Resistant Hardcoat