Preserflo MicroShunt Versus Trabeculectomy (PMSvT)

March 24, 2026 updated by: Joanna Konopińska, Medical University of Bialystok

Preserflo MicroShunt Implantation Versus Trabeculectomy in Managing Open-Angle Glaucoma

The goal of this randomized controlled clinical trial is to learn whether two minimally invasive bleb-forming glaucoma implants can effectively treat adult patients with open-angle glaucoma who require surgical lowering of intraocular pressure (IOP). Specifically, the study evaluates whether the PRESERFLO™ MicroShunt is at least as effective as the trabeculectomy in reducing IOP after surgery.

The main questions it aims to answer are:

Does the PRESERFLO™ MicroShunt provide IOP reduction at 12 months that is non-inferior to trabeculectomy? How do these two surgeries compare over 12 months with respect to medication reduction, need for additional glaucoma procedures, complications, and preservation of visual function and ocular structures?

Participants will:

Be randomly assigned (1:1) to receive either the trabeculectomy or the PRESERFLO™ MicroShunt during a single glaucoma surgery.

Attend scheduled follow-up visits over 12 months for eye-pressure measurements, vision testing, visual-field testing, OCT imaging, endothelial-cell counts, and safety assessments.

Receive standard postoperative care and report any complications or additional treatments during the study period.

Study Overview

Status

Recruiting

Conditions

Intervention / Treatment

Study Type

Interventional

Enrollment (Estimated)

100

Phase

  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Locations

  • Poland
    • Polska
      • Bialystok, Polska, Poland, 15-089
        • Recruiting
        • Medical University of Bialystok
        • Contact:

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

->21 years of age

  • An established diagnosis of: Primary open angle glaucoma, Normal tension glaucoma, Pigment dispersion glaucoma (PDG) or Pseudoexfoliative glaucoma (PEXG)
  • Inadequately controlled on maximum tolerated medical therapy
  • Mean Deviation (MD) </= -3
  • Intraocular pressure of 14-28 mmHg
  • Endothelial Cell Count ≥1000 cells/mm2

Exclusion Criteria:

  • An established diagnosis of: Closed-angle glaucoma or Secondary open-angle glaucoma (besides PDG and PEX)
  • Lens status: Aphakic patients or Anterior chamber intraocular lens
  • Previous procedures: Glaucoma shunt/valve/ surgery or cyclodestructive procedure, Selective laser trabeculoplasty within the past 3 months, Incisional ophthalmic surgery involving the conjunctiva within the past 3 months, Clear corneal cataract or trabecular meshwork surgery conducted within the past 6 months
  • Presence of intraocular silicone oil
  • No light perception vision
  • Current corticosteroid use (ocular or oral)
  • Conjunctival pathologies (e.g., pterygium)
  • Active inflammation (e.g., blepharitis, conjunctivitis, keratitis, uveitis)
  • Vitreous present in the anterior chamber
  • Active iris neovascularization or neovascularization of the iris within 6 months of the surgical date
  • Unwillingness or inability to give consent, accept randomization or return for and participate in scheduled protocol visits

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Active Comparator: Procedure: trabeculectomy
trabeculectomy with mitomycin C
Procedure: Trabeculectomy with MMC
Trabeculectomy (TE) has been steadily improved over the last decades and remains globally accepted as the therapeutic gold standard, great efforts are being made to develop alternative surgical options. This is mainly due to the high rate of complications after TE, including hypotony with choroidal detachment, a flat anterior chamber, or hyphema, as well as a complex postoperative follow-up
Experimental: PreserFlo Microshunt
Preserflo MicroShunt implantation
Device: Preserflo MicroShunt Implantation
The PRESERFLO™ MicroShunt is a SIBS-polymer microshunt. This devices bypasses the trabecular meshwork and lower eye pressure via a subconjunctival filtering bleb, aided by intra-operative mitomycin C to reduce scarring. It has already been approved for the European market and therefore bear the CE mark.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Intraocular pressure
Time Frame: 12 months
Intraocular pressure will be assesed with Goldmann Applanation tonometer at the same time of a day between 8.00-10.00 am.
12 months

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
complications
Time Frame: 12 months
12 months
Number of medications
Time Frame: 12 months
12 months
surgical success
Time Frame: 12 months

Complete surgical success is defined as achieving an IOP of ≤ 18 mmHg and a reduction of ≥20% from baseline, without the need for additional antiglaucoma medication.

Qualified success was defined as achieving an IOP ≤ 18 mmHg and a reduction of ≥20% from baseline, while concurrently using intraocular pressure-lowering medications (maximum 2).
12 months

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Medical University of Bialystok

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

March 1, 2026

Primary Completion (Estimated)

December 1, 2027

Study Completion (Estimated)

December 1, 2028

Study Registration Dates

First Submitted

March 16, 2026

First Submitted That Met QC Criteria

March 24, 2026

First Posted (Actual)

March 27, 2026

Study Record Updates

Last Update Posted (Actual)

March 27, 2026

Last Update Submitted That Met QC Criteria

March 24, 2026

Last Verified

March 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • 1776 (Other Identifier: Medical University of Bialystok)

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

UNDECIDED

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

product manufactured in and exported from the U.S.

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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