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Reproducibility and agreement in evaluating retinal nerve fibre layer thickness between Stratus and Spectralis OCT
S N Arthur1, S D Smith, M M Wright
1Department of Ophthalmology, University of Minnesota, Minneapolis, MN 55455, USA.
Eye (London, England)
|November 27, 2010
Summary
Spectralis optical coherence tomography shows higher reproducibility than Stratus OCT for retinal nerve fibre layer (RNFL) measurements. However, the devices show significant differences, meaning RNFL measurements are not interchangeable in clinical practice.
Area of Science:
- Ophthalmology
- Medical Imaging
- Biomedical Engineering
Background:
- Accurate measurement of retinal nerve fibre layer (RNFL) thickness is crucial for diagnosing and monitoring glaucoma and other optic neuropathies.
- Optical coherence tomography (OCT) is a key technology for RNFL assessment, with devices like Stratus and Spectralis widely used.
Purpose of the Study:
- To compare the intra-device reproducibility of RNFL measurements between Stratus and Spectralis OCT devices.
- To analyze the inter-device correlation and agreement of RNFL thickness measurements obtained from these two OCT platforms.
Main Methods:
- A prospective observational study involving 30 healthy individuals.
- Each participant's eye was scanned three times by the same operator using both Stratus and Spectralis OCT devices in a single session.
- Reproducibility, correlation, and agreement were assessed using intra-class correlation coefficients (ICCs), correlation coefficients (R), and Bland-Altman plots (BAPs).
Main Results:
- A statistically significant difference was observed in mean RNFL thickness between Stratus (106.2 ± 6.9 μm) and Spectralis (100.0 ± 7.3 μm).
- Spectralis demonstrated higher ICCs for RNFL measurements compared to Stratus across various sectors and quadrants.
- Bland-Altman plots revealed a systematic difference, with Spectralis yielding thinner RNFL values than Stratus.
Conclusions:
- Spectralis OCT exhibits superior intra-device reproducibility for RNFL measurements compared to Stratus OCT.
- Despite good inter-device correlation, the significant differences in RNFL thickness measurements indicate that data from Stratus and Spectralis are not interchangeable for clinical use.
