[The significance of the scleral flap for the surgery of glaucoma (author's transl)].

The importance of the scleral flap used in the covered fistulising operations is reported. The authors describe in detail significant observations contributing to the successful outcome of these operations. They make the hypothesis, supported by their microsurgical observations, for the formation of a slit-like space under the scleral flap, named "Parathalamus", which is an extension of the anterior chamber. This space communicates with the anterior chamber through the trephination hole. The aquous humor flows to the subconjunctival space through a fine membraneous tissue, formed on the surface of the lips of the "parathalamus".