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Kaplan–Meier survival curves in the POAG and ExG groups according to which criterion was used to define failure. Criterion (A): IOP > 18 mmHg, <20% reduction in preoperative IOP value, or reoperation for glaucoma. Criterion (B): IOP > 14 mmHg, <20% reduction in preoperative IOP value, or reoperation for glaucoma. ExG, exfoliation glaucoma; IOP, intraocular pressure; POAG, primary open-angle glaucoma.
