We analyzed three POAG-associated single-nucleotide polymorphisms: rs9913911, an intron variant in growth arrest-specific 7 (GAS7), one of the genes that influences IOP; rs944801, an intron variant within CDKN2B-AS1, and rs2093210, an intron variant within SIX6, known to be associated with vertical cup-disc ratio, an important optic nerve head parameter that is often used to define or diagnose glaucoma. This evidence concerns the gene SIX6 and glaucoma.