Intraoperative primary partial occlusion of the PreserFlo MicroShunt to prevent initial postoperative hypotony.

"Declarations Conflict of interestThe Authors declare that there is no conflict of interest. None of the authors have a financial or proprietary interest in any material or method mentioned in the manuscript. Ethical approvalAccording to national medical regulations on retrospective single center clinical studies, the Ethics Committee of the University of Cologne stated that an approval was not required for this study. All tenets of the Declaration of Helsinki have been regarded. Conflict of interest The Authors declare that there is no conflict of interest. None of the authors have a financial or proprietary interest in any material or method mentioned in the manuscript."

"Funding Open Access funding enabled and organized by Projekt DEAL. No funding was received for this work."