The publication this month of “A Randomized Trial of a Schlemm’s Canal Microstent with Phacoemulsification for Reducing Intraocular Pressure in Open Angle Glaucoma” by Pfieffer et al (see http://www.aaojournal.org/article/ S0161-6420(15)00315-2/abstract), describing a promising new treatment for glaucoma, has stimulated this reflection of how glaucoma therapy has changed in the past quarter cen...