Medical data collected in this review included general medical diagnoses and systemic medications. Ocular data collected included ocular history, diagnoses, ocular examination results, ophthalmic medications used before and after the operation, surgical technique, and surgical complications. Surgical complications were defined as complications that resulted in decreased VA or required additional surgical intervention. Complications included, but were not limited to, hypotony maculopathy, flat anterior chamber that needed reformation, choroidal hemorrhage, and retrobulbar hemorrhage. Hypotony maculopathy was considered to be present if chorioretinal folds were noted in the macular area according to slitlamp examination with a noncontact fundus lens and with a decrease in VA. Information collected from the ophthalmic examination included VA, VF test results, anterior segment slitlamp examination results, IOP, gonioscopy findings, and fundus examination findings. Preoperative VA and IOP were recorded from the closest visit before surgery, and postoperative VA and IOP were recorded at 1 day, 1 week, 1 month, 3 months, and 6 months after the operation. The VA at 3 months postoperatively was used for analysis to allow enough time for recovery of vision after surgery and avoid transient vision decreases related to the surgery. The VA was measured with a Snellen chart and was converted to the logMAR VA scale for comparison. LogMAR values of −1.40, −2.70, and −4.70 were assigned to counting fingers, hand motions, and light perception, respectively.14 Severe loss of central vision was defined as best-corrected VA of 20/200 or less in the affected eye, counting fingers or less if preoperative vision was less than 20/200, or a reduction of more than 4 lines of Snellen VA at 3 months postoperatively. Medical records were carefully reviewed to determine if any evident cause was responsible when there was a severe loss of central vision.