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Updated: Jun 29, 2026
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Comparison of Agreement and Accuracy using Binocular Wavefront Optometer with Autorefractor and Phoropter
Published on: September 16, 2025
Interobserver variability of the Würzburg bleb classification score.
Thomas Klink1, Sybille Schrey, Uta Elsesser
1Department of Ophthalmology, Julius Maximilian University, Würzburg, Germany. klink_t@klinik.uni-wuerzburg.de
Summary
The Würzburg bleb classification score (WBCS) shows high interobserver agreement for assessing filtering blebs. This standardized method for bleb morphology evaluation is reliable in clinical practice.
Area of Science:
- Ophthalmology
- Glaucoma Surgery
- Surgical Outcomes
Background:
- The Würzburg bleb classification score (WBCS) is used for standardized assessment of filtering blebs.
- Evaluating interobserver variability is crucial for the reliability of any clinical scoring system.
Purpose of the Study:
- To prospectively evaluate the interobserver variability of the Würzburg bleb classification score (WBCS).
- To determine the reliability of the WBCS in grading clinical bleb morphology.
Main Methods:
- 113 eyes from 104 patients were examined post-surgery by 3 masked ophthalmologists.
- The WBCS assesses vascularity, corkscrew vessels, encapsulation, microcysts, and bleb height.
- Interobserver consistency and agreement were calculated using intraclass correlation coefficients (ICC).
Main Results:
- Single rater ICC values ranged from +0.52 (microcysts) to +0.74 (total score).
- Mean ICC values across 3 raters ranged from +0.76 (microcysts) to +0.90 (total score).
- High ICC values indicate substantial agreement for all assessed parameters.
Conclusions:
- The WBCS demonstrates high interobserver consistency and absolute agreement.
- The WBCS is a reliable and standardized tool for assessing bleb morphology in clinical practice.
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