MMP9 and glaucoma: Among these included articles, 9 studies focused on associations between MMP-9 polymorphisms (rs17576 G > A, rs17577 G > A, rs3918249 C > T, rs3918242 C > T, rs3918254 C > T, rs3787268 G > A) and glaucoma [10, 17–24] (Table 1), 4 articles on associations between an MMP-1 polymorphism (rs1799750 1G > 2G) and glaucoma [19, 22, 24, 25] (Table 2), and 2 articles on associations between an MMP-2 polymorphism (rs243865C > T) and glaucoma [19, 26] (Table 2).