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Cyclocryotherapy

Cyclodestruction procedures aim to decrease intraocular pressure (IOP) by decreasing production of aqueous humor by the ciliary body (specifically the ciliary processes). There are 3 basic approaches to cyclodestruction (which some prefer to call cycloablation): 1) Cyclocryotherapy 2) Trans-scleral laser cycloablation 3) Endoscopic laser cycloablation All 3 techniques share the common goal of decreased aqueous production, and all share the possible side effects of inflammation (including possible sympathetic ophthalmia), ineffective treatment, and over-treatment with resultant hypotony or even phthisis. Although there is not uniform agreement, most surgeons reserve cycloablation procedures for those cases refractory to, or not amenable to, procedures that improve aqueous outflow such as angle surgery, glaucoma drainage implant surgery, and trabeculectomy. Cyclocryotherapy, the oldest cyclodestructive method, involves freezing the ciliary processes from an external approach.