Purpose: To test the efficacy of ab interno Nd:YAG laser in reopening closed trabeculectomies and to specify the factors influencing the success or failure of the revision.
Methods: 27 patients underwent ab interno revision of their failed trabeculectomies with a Q switched, single-shot Cooper Vision 2500 Nd:YAG laser. The cause of obstruction was iris in 12 patients, transparent membrane in sclerectomy in 8 and fibrosis of the scleral flap in the remaining 7.