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Evaluation of Filtering Blebs Using the "Wuerzburg Bleb Classification Score" Compared to Other Clinical Findings, e.g. the Intraocular Pressure (IOP)

This study has been completed.
ClinicalTrials.gov Identifier:
First Posted: February 1, 2011
Last Update Posted: November 4, 2011
The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details.
Information provided by (Responsible Party):
University of Zurich

It is well established to assess the functionality of a filtering bleb by intraocular pressure (IOP), either as an absolute value or as a percent reduction, and by the need of additional antiglaucoma drugs. It is also possible to evaluate the appearance of a bleb by a clinical score, e.g. the "Wuerzburg bleb classification score" (WBCS). The purpose of this study was to find out whether there is a correlation between clinical findings, in particular IOP and the WBCS.

100 eyes within two years after trabeculectomy were included into the study. Using colour photographs the filtering bleb was evaluated according to the WBCS from two different examiners, both on different levels of clinical experience. WBCS = 1 indicates poor bleb appearance, WBCS = 15 indicates optimal bleb appearance. At the same time, clinical findings like intraocular pressure, best corrected visual acuity, slit lamp biomicroscopy and medical history were taken by another examiner.

  • Trial with surgical intervention

Condition Intervention Phase
Glaucoma Procedure: Trabeculectomy Phase 4

Study Type: Observational
Study Design: Observational Model: Case-Only
Time Perspective: Retrospective

Resource links provided by NLM:

Further study details as provided by University of Zurich:

Estimated Enrollment: 100
Study Start Date: January 2009
Estimated Study Completion Date: December 2010
Intervention Details:
    Procedure: Trabeculectomy
    A scleral flap is created. The aqueous humor is so guided under the conjunctiva to lower IOP.

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Ages Eligible for Study:   18 Years and older   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
Sampling Method:   Non-Probability Sample
Study Population
Diagnosis of glaucoma, status post trabeculectomy

Inclusion criteria: Diagnosis of glaucoma, status post trabeculectomy

Exclusion criteria: age <18 Jahre, other optic neuropathy than glaucoma

  Contacts and Locations
Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT01287442

University Hospital Zurich, Ophthalmic Clinic
Zurich, ZH, Switzerland, 8091
Sponsors and Collaborators
University of Zurich
Principal Investigator: Jens Funk, Prof. MD University Hospital Zurich, Ophtalmic Clinic
  More Information

Publications automatically indexed to this study by ClinicalTrials.gov Identifier (NCT Number):
Responsible Party: University of Zurich
ClinicalTrials.gov Identifier: NCT01287442     History of Changes
Other Study ID Numbers: TE-WBCS-IOP
First Submitted: January 28, 2011
First Posted: February 1, 2011
Last Update Posted: November 4, 2011
Last Verified: November 2011