MMP1 and exfoliation syndrome: Remarkably, investigating the association between exfoliation syndrome and XFG and the MMP1 −1607 1G/2G polymorphism, Tsironi and coworkers [37] reported an allele contrast of borderline significance for exfoliation syndrome (OR=1.47; 95%CI: 1.03–2.10; p=0.04), but not for XFG.