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Success of the second Ahmad glaucoma valve in refractory glaucoma based on criterion 1. Success was calculated using Kaplan–Meier analysis, where the dotted lines indicate the 95% confidence intervals and the hatch marks indicate censored subjects (eyes). The 6, 12, 18, and 42 months success (95% confidence intervals) was 94% (87, 100), 85% (72, 99), 80% (63, 96), and 53% (21, 85), respectively. Median time to failure was 60 (26, 94) months
