Figure 3. Meta-analysis of the distribution of single nucleotide polymorphism (SNP) rs3825942 between exfoliation syndrome (XFS) and exfoliation glaucoma (XFG). Squares indicate study-specific risk difference (RD); the size of the box is proportional to the weight of the study; horizontal lines indicate 95% confidence interval (CI); diamond indicates summary RD with its corresponding 95% CI. Meta-analysis indicated there is no statistical difference of distribution of the SNP rs3825942 G and A allele between XFS and XFG.