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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.
Information provided by (Responsible Party):
University of Zurich Identifier:
First received: January 28, 2011
Last updated: November 3, 2011
Last verified: November 2011

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
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.

Ages Eligible for Study:   18 Years and older
Genders Eligible for Study:   Both
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

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Please refer to this study by its identifier: 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

No publications provided by University of Zurich

Additional publications automatically indexed to this study by Identifier (NCT Number):
Responsible Party: University of Zurich Identifier: NCT01287442     History of Changes
Other Study ID Numbers: TE-WBCS-IOP
Study First Received: January 28, 2011
Last Updated: November 3, 2011
Health Authority: Switzerland: Swissmedic processed this record on November 20, 2014