Material and Method: This was a retrospective study performed on data from patients with PACG underwent trabeculectomy at Mettapracharak Hospital, Thailand between January and December 2012. The outcomes of trabeculectomy were assessed in term of final intraocular pressure (IOP), visual acuity change, and the incidence of complications. A complete success was defined as achieving IOP of 21 mmHg or less without medication and a qualified success was defined as IOP of 21 mmHg or less with antiglaucoma medications.

Results: Thirty-six eyes from 36 patients were reviewed. The average follow-up period was 23.5±8.8 months. The overall success rate was 80.5%. A complete success in final IOP was found in 21 patients (58.3%), and a qualified success was found in eight patients (22.2%). Two patients (5.5%) had lost two or more lines of Snellen acuity at the last follow-up visit compared with their preoperative visual acuity, and 88.9% of patients had unchanged visual acuity at last follow-up. Bleb encapsulation and increasing cataract formation (19.4% and 16.7% respectively) were the most frequent complications found.

Conclusion: Trabeculectomy could provide a good success rate in patients with PACG. However, this procedure had risks of visual loss and some complications.

Keywords: Primary angle-closure glaucoma, Trabeculectomy, Intraocular pressure