Fig. 1From: The effects of the first versus second glaucoma drainage implant surgery in patients with primary open-angle glaucomaIntraocular pressure (IOP) and medication score prior to surgery and during the postoperative follow-up period in Groups I and II. Friedman’s test: P < 0.01. IOP reduction was statistically significant at each time point. *P < 0.05 vs. preoperative for the first GDI group, **P < 0.05 vs. preoperative for the second GDI groupBack to article page