MTHFR and glaucoma: Egger’s test found evidence for the publication bias between MTHFR C677T polymorphism and glaucoma risk under the allele model (T vs. C: PBegg = 0.052, PEgger = 0.031, Fig. 3), homozygote model (TT vs. CC: PBegg = 0.010, PEgger = 0.008) and the recessive model (TT vs. CT + CC: PBegg = 0.022, PEgger = 0.005).