Traceculotomy, deep sclerotomy and viscocanalostomy. Non-fistulating microsurgical glaucoma operations ab externo

Filtering procedures have been the gold standard in glaucoma surgery for mo re than 30 yea rs. Trabeculotomy, deep sclerectomy, and viscocanalostomy mi ght become the procedures of first choice in the future. These new, non-pen etrating procedures have not yet been compared to filtering procedures in p rospective randomized studies with longterm follow-up. In addition, it is n ot really known how they modify outflow of the aqueous humor. The surgical technique is described and the most likely underlying effects are discussed .