GSTM1 and open-angle glaucoma: Several studies have been conducted in different populations to determine the association of GSTT1 and GSTM1 polymorphisms with primary open-angle glaucoma [13,26,28], but to date only three studies have been reported on pseudo-exfoliative glaucoma (PEXG) in populations of Arabs, Turks and Swedes [29-31].