SUMMARY
Retrospectively, 284 trabeculectomies performed in primary glaucomas were studied for a purpose of analysing the influence of prolonged antiglaucoma topical medication in outcome of the procedure. 176 patients received antiglaucoma eye-drops for 26,5±20 months and 45 for a period less than 1 month. A greater and significative proportion of success were observed in nontreated eyes (96,29%) when compared with treated eyes (83,91%). The results suggest that prolonged antiglaucoma topical medication might be a predisposing factor to trabeculectomy failure.