The trabeculectomy is the gold standard in glaucoma surgery, nevertheless often postoperative interventions have to be done. (1),(2) The PreserFlo MicroShunt (Santen, Osaka, Japan) implantation occurs without critical steps of trabeculectomy. (3) According to a study a 20% eye pressure reduction was achieved in 53.9% of patients one year after PreserFlo MicroShunt implantation and the risk of postoperative hypotony was clearly minimized. (4) It has been shown that after trabeculectomy there is a stable development of visual fields in the first 3 months after surgery and then, despite adequate intraocular pressure reduction, visual fields deteriorate. (5) At the Klinikum Klagenfurt structural and functional changes after PreserFlo MicroShunt Implantation shall be evaluated.
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Visual field progression (mean deviation, MD) 1 month postoperative, 3 months postoperative, 6 months and 12 months postoperative after PreserFlo MicroShunt Implantation.
Timeframe: Visual fields taken at baseline should be compared to visual fields 1 month postoperativ, 3 months postoperative and 1 year postoperative.
RNFL (retinal nerve fiber layer) at baseline before sugery and changes after1 month, 3 months, 6 months and 12 months postoperative after PreserFlo MicroShunt Implantation will be evaluated.
Timeframe: The measurement of the nerve fiber index shall be done at baseline before surgery and 1 month, 3 months, 6 months and 12 months after surgery.
Intraocular pressure will be taken 1 month, 3 months, 6 months and 12 months after PreserFlo MicroShunt Implantation.
Timeframe: The intraocular pressure will be taken postoperative after one month, 3 months, 6 months and 12 months.