Purpose: To evaluate the burden of incisional glaucoma surgery (trabeculectomy and glaucoma drainage device implantation) after laser trabeculoplasty (LTP) in the United States. Design: Retrospective, matched, case-comparison study. Participants: Medicare beneficiaries who underwent LTP between January 2012 and December 2014 were identified using the 5% Medicare Current Beneficiary Survey. Methods: Subjects aged 35 years or older at the time of LTP with ocular hypertension, suspected glaucoma, or mild open-angle glaucoma (OAG) were matched to a comparison group without LTP on the basis of age, gender, race, geographic region, and glaucoma diagnosis codes. Survival analysis and Cox proportional hazard analysis were performed. Main Outcome Measures: Primary analysis included risk of incisional glaucoma surgery. Secondary analysis included risk of conversion to moderate or severe OAG based on billing data.
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