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Prof. Dr., Gazi Üniversitesi Tıp Fakültesi, Göz Hastalıkları, Ankara, Türkiye Diagnosis, etiopathogenesis and especially surgical treatment options of chronic ocular hypotony are discussed in this review. Main mechanisms of chronic hypotony are increased aqueous outfl ow and reduced aqueous production. While increased fi ltration can be effectively treated by surgery in most cases, there is no effective and longstanding therapy for ciliary body dysfunction. Dissection and removal of cyclic membranes and relief of traction on ciliary body provide a moderate increase in intraocular pressure. Occlusion of aqueous outfl ow via implanting a capsular tension ring to the iridocorneal angle offers effective increase in intraocular pressure in patients having some healthy ciliary epithelium. However, in eyes with no or minimal aqueous production, blockage of the iridocorneal angle would not work. Ciliary body transplantation or ventriculo-vitreal (cerebrovitreal) shunt applications may be future treatment options for protecting these eyes from development of phytisis bulbi. Keywords : Hypotony, surgical therapy, etiopathogenesis of Hypotony