Purpose: Toevaluate the level of intraocular pressure (IOP) andglaucomatherapy during two years after trabeculectomy (TE) with two releasable sutures (RS) on the first and the second operated eye. Methods: In a retrospective study, preoperative and postoperative IOP and glaucoma therapy in 40 patients with open angle glaucoma, were evaluated. Patients underwent standardized TE with two RS on both eyes performed by the same surgeon. The first (worse) eye was operated on an average of three years after the diagnosis of glaucoma, and after 8,2 ± 6,9 months the second (better) eye was operated on. Results: TE with RS significantly decreased the level of IOP (p < 0.0001) and therapy (p < 0.0001) during a two year follow up period. There was no significant difference in IOP (p = 0.226) and glaucoma therapy (p = 0.086) between the first and the second operated eye. IOP was stabilised within 2 - 3 months after surgery for most patients, however glaucoma therapy was added for some to keep the target pressure. After one year IOP and therapy were stable for all patients. Conclusion: There is no difference between the firstorse and the second-better operated eye regarding IOP and glaucoma therapy during a two year period.

        Key words: bilateral trabeculectomy, glaucoma therapy, intraocular pressure, releasable sutures, the first and the second operated eye