Abstract
Progressive loss of retinal ganglionic cells (RGC) causes degeneration of optic nerve axons, which leads to blindness in glaucoma. Elevated intraocular pressure (IOP) is the most important, treatable risk factor. Currently, the management of glaucoma is centred on reducing the IOP, and drugs in the form of topical drops are the first line of management. Drugs reduce IOP either by suppressing aqueous humour secretion or improving the aqueous humour outflow. Newer drugs added during the past three decades to the armamentarium of glaucoma treatment have targeted the aqueous outflow. With an evolving understanding of the pathogenesis of glaucoma, the role of 24-h IOP control and other IOP-independent risk factors affecting ocular blood flow and RGC toxicity is also being actively studied in clinical and pre-clinical models of glaucoma. The role of available drugs in controlling IOP over 24 h is being evaluated. Improvement of ocular blood flow and neuroprotection are seen as potential drug targets for preventing the loss of RGC. In this article, we review the pharmacotherapy of glaucoma based on current therapeutic principles.
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