Long-term follow-up of primary glaucoma surgery with Ahmed glaucoma valve implant versus trabeculectomy.

Purpose: To compare the long-term results of trabeculectomy and Ahmed glaucoma valve implant in the initial surgical management of primary open- and closed-angle glaucoma.

Design: Randomized controlled clinical trial.

Methods: One eye each of consecutive patients with primary glaucoma and without prior intraocular surgery was randomized to receive either trabeculectomy or the Ahmed implant.