Goniotrepanation (gotrep) and further observations on this operation for chronic glaucoma.

The conclusions from the current data on the goniotrepanation, which are based upon the systematic observations on 175 eyes operated on with this microsurgical procedure and for a period of 2 to 4 years, can be characterized as follows: a) Intraocular pressure regulation obtained in 91 per cent of the cases. b) Avoiding excessive hypotony. Mean intraocular pressure value postoperatively 12 to 14 mm Hg. c) Achieving a regular level filtration site overlying the trephination hole, limiting polycystic conjunctival degeneration to 8.5 per cent, which is common with the usual filtration procedures. d) Maintenance of intact visual function in a great percentage of the operated eyes, with a decrease in visual acuity in 5 per cent without any observable visual deterioration. e) The advantages of goniotrepanation listed above, emanating from observations over a 2-year period, point explicitly to the effectiveness of this operative procedure and explain the survival of goniotrepanation up to the present.