Figure 4. Forest plots for APOE polymorphisms and primary open-angle glaucoma risk in the genetic models of ε2 allele vs. ε3 allele and ε4 allele vs. ε3 allele. Every study was represented by a square whose size was proportional to the weight of the study. Diamond indicated summary odds ratios (OR) with its corresponding the pseudo 95% confidence limits (95% CI). A: Forest plot for APOE polymorphisms and POAG risk in the genetic model of ε2 allele vs. ε3 allele. B: Forest plot for APOE polymorphisms and POAG risk in the genetic model of ε4 allele vs. ε3 allele.