CASC15 and Corneal astigmatism: Single marker-based association tests for corneal astigmatism identified four genome-wide significant loci (P < 5 × 10−8) near the genes ZC3H11B (1q41), LINC00340 (6p22.3), HERC2/OCA2 (15q13.1) and NPLOC4/TSPAN10 (17q25.3).