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Laser trabeculoplasty (LTP) was popularized in 19791 in eyes receiving maximal medical therapy. Various prospective clinical trials sponsored by the National Institutes of Health have since better defined its usefulness in early and advanced glaucoma. Today, the American Academy of Ophthalmology Primary Open Angle Glaucoma Preferred Practice Pattern finds that argon LTP and selective LTP have comparable intraocular pressure (IOP) lowering efficacy and safety profiles, but additional LTP (regardless of the laser type) has a decreased rate of success and an increased complication profile, including permanent IOP increase.2
Robin AL. Public Health Policy Lessons From Oklahoma. JAMA Ophthalmol. 2016;134(10):1102-1103. doi:10.1001/jamaophthalmol.2016.2573