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Konstas et al. (512) report that surgically treated patients have lower mean peak and range of IOP over 24 hrs than patients on maximal tolerated medical therapy. This prospective study was straightforward and confirms earlier results. Long ago we published that the range of IOP is considerably reduced after surgery. Assuming that the patients in both groups of Konstas et al. were comparable the results stress again an important aspect of glaucoma surgery: a flat IOP curve. Over the past thirty years the variation of IOP over time has been implicated as a possible influence on progression.