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Kaplan-Meier plot of the cumulative probability of failure defining inadequate intraocular pressure (IOP) reduction as IOP > 21mmHg or not reduced by 20% below baseline, IOP ≤ 5 mmHg on two consecutive follow-up visits after 3 months, reoperation for glaucoma, or loss of light perception vision (p = 0.20 using log-rank test).
