GJD2 and Astigmatism: Haplotype analysis of SNPs in the GJD2 gene revealed two statistically significant haplotypes: ACTAGG for rs634990 and TTTAGA for rs524952, which statistically significantly reduced the incidence of hyperopia and hyperopia with astigmatism 0.410 (95% CI: 0.220–0.765) and 0.383 (95% CI: 0.199–0.737), respectively, (p < 0.05) (Table 3).