Figure 2. Begg’s funnel plot with the Egger’s test for publication bias between TNF-α −308G/A (rs1800629) polymorphisms and risks of open angle glaucoma. The horizontal line in the funnel plot indicates the fixed-effects summary estimate, whereas the diagonal lines pseudo-95% CI limits about the effect estimate. In the absence of publication bias, studies are distributed symmetrically above and below the horizontal line.