Comparison of trabeculectomy and Ex-PRESS implantation in fellow eyes of the same patient: A prospective, randomised study

E. Dahan, G. J. Ben Simon, A. Lafuma

Research output: Contribution to journalArticlepeer-review


Purpose: To compare intraocular pressure (IOP) over time after standard trabeculectomy vsEx-PRESS implantation in patients with bilateral primary open-angle glaucoma (POAG). Design: Prospective, randomised study. Patients and methods: This study included adult patients with bilateral POAG necessitating surgery. Each patient underwent trabeculectomy in one eye and Ex-PRESS implantation under a scleral flap in the other eye according to randomised contralateral allocations. Efficacy was assessed by IOP values and success rates (IOP threshold and/or need for topical glaucoma medication) during 30 months. Statistical analysis included Generalised Estimate Equation and Cox Survival models, and paired t-tests. Results: Thirty eyes of 15 patients were studied for a mean of 23.6 months (SD, ±6.9). At the last follow-up visit, mean pre-operative IOP decreased from 31.1 (±14.2) to 16.2 (±1.5) mm Hg after trabeculectomy, and from 28.1 (±9.0) to 15.7 (±1.8) mm Hg after Ex-PRESS implantation (P=0.001). The mean number of anti-glaucoma medicines prescribed at the last follow-up decreased from 3.7 pre-operatively (both groups) to 0.9 after trabeculectomy vs0.3 after Ex-PRESS implantation (P=0.001). Complete success rates (5<IOP<18 mm Hg without medications) were higher with Ex-PRESS compared with trabeculectomy (P=0.0024). Postoperative complications were more frequent after trabeculectomy (33%) compared with Ex-PRESS (20%), with four trabeculectomy eyes (27%) needing postoperative interventions, compared with none with Ex-PRESS. Conclusions: Trabeculectomy and Ex-PRESS implantation provided similar IOP control, but the Ex-PRESS group had a lower rate of complications, fewer postoperative interventions, and needed less glaucoma medications. & 2012 Macmillan Publishers Limited All rights reserved.

Original languageEnglish
Pages (from-to)703-710
Number of pages8
Issue number5
StatePublished - May 2012
Externally publishedYes


  • Ex-PRESS
  • primary open-angle glaucoma
  • trabeculectomy


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