Figure 2. Begg’s funnel plots of random effects meta-analysis of the association of genetic polymorphisms in CYP1B1 with primary open-angle glaucoma (POAG). The horizontal line in the figure represents the overall estimated log-transformed odds ratio. The two diagonal lines represent the pseudo 95% confidence limits of the effect estimate. A: Funnel plot for random effects meta-analysis of rs180040 with POAG. B: Funnel plot for random effects meta-analysis of rs1056836 with POAG. C: Funnel plot for random effects meta-analysis of rs10012 with POAG.