The dependence of hydrodynamics on the topography of trabeculectomy performed simultaneously with cataract extraction was checked in 35 eyes with cataract and glaucoma. The eye was opened by a three-surface incision with a broad scleral flap. The specimen were examined in a microscope. In 21 eyes the whole trabeculum together with Schlemm's canal were excised, in 12 eyes the anterior band. In the specimen from 2 eyes no elements of the trabeculum could be found. The dependence of the regulation of the IOP on the geography of the trabeculectomy was established. Accepting the filtering mechanism of the trabeculectomy one may assume that the applied method of incision promotes the formation of the outflow++ ways of the aqueous in a high percentage of cases.
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