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Repeatability and reproducibility of optic nerve head topography using the retinal thickness analyzer
Esther M Hoffmann1, Felipe A Medeiros, Christina Kramann
1Department of Ophthalmology, University of Mainz, Mainz, Germany. ehoffmann@glaucoma.ucsd.edu
Summary
The Retinal Thickness Analyzer (RTA) shows high variation in optic disk topography measurements. These results suggest careful interpretation is needed for glaucoma diagnosis and monitoring.
Area of Science:
- Ophthalmology
- Medical Imaging
Background:
- Optic disk topography is crucial for diagnosing and monitoring glaucoma.
- The Retinal Thickness Analyzer (RTA) is a tool used for optic disk imaging.
Purpose of the Study:
- To evaluate the repeatability and reproducibility of optic disk topographic parameters obtained with the RTA.
- To assess the reliability of RTA measurements for clinical use.
Main Methods:
- Thirty-nine healthy subjects' eyes were analyzed.
- Three independent observers performed three consecutive optic disk topography measurements.
- Variance component analysis was used to assess combined repeatability and reproducibility.
Main Results:
- Six specific topographic parameters demonstrated acceptable repeatability and reproducibility (17.6-28.4% variability).
- However, the overall average reproducibility and repeatability for all optic disk parameters measured by the RTA was not acceptable (33.4% variability).
Conclusions:
- Optic disk topography analysis using the RTA exhibits significant variation.
- Measurements should be interpreted with caution in the context of glaucoma diagnosis and disease progression monitoring.