The association of primary open-angle glaucoma (POAG) and cataract has led many ophthalmic surgeons to perform combined procedures, to treat the two diseases at the same time, in spite of the well-known hypotensive effect of cataract extraction alone, which seems to be limited in duration, rarely exceeding one year in actual glaucoma patients. Surgical technique and personal study are explained. Since its first description in 1989, deep sclerectomy (DS) has regularly evolved to attain a reproducible surgical method, which is not yet stereotyped, as every ophthalmic surgeon proposes his own technique. The main advantage of DS is the absence of postoperative hypotony with its well-known complications; it also gives less astigmatic change than trabeculectomy.