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Comparing ophthalmoscopy, slide viewing, and semiautomated systems in optic disc morphometry
M Kamran Ikram1, Petra H Borger, Jacqueline J M Assink
1Department of Epidemiology and Biostatistics, Erasmus University, Rotterdam, The Netherlands.
Ophthalmology
|March 5, 2002
Summary
Different methods for measuring optic disc morphometry yield varying results. The Topcon ImageNet System showed higher values than indirect ophthalmoscopy and Heidelberg Retina Tomograph, impacting clinical interpretation.
Area of Science:
- Ophthalmology
- Medical Imaging
- Glaucoma Diagnosis
Background:
- Accurate optic disc morphometry is crucial for diagnosing and monitoring glaucoma.
- Various imaging techniques exist, but their comparative performance is not fully established.
Purpose of the Study:
- To compare optic disc measurements using indirect ophthalmoscopy, Heidelberg Retina Tomograph (HRT), stereoscopic slide viewing (SSV), and Topcon ImageNet System (ImageNet).
Main Methods:
- Population-based cross-sectional study involving 324 subjects (567 eyes) from the Rotterdam Study.
- Comparison of vertical cup/disc ratios (VCDRs) across all four methods.
- Analysis of disc area, neural rim area, cup area, and cup volume between HRT and ImageNet.
Main Results:
- Mean VCDRs varied significantly: ophthalmoscopy (0.25), HRT (0.42), SSV (0.39), and ImageNet (0.50).
- ImageNet yielded higher mean values for VCDR, disc area, cup area, and cup volume compared to HRT and ophthalmoscopy.
- Correlations for VCDR were 0.42 (ophthalmoscopy), 0.57 (SSV), and 0.75 (ImageNet vs. HRT).
Conclusions:
- Discrepancies in disc morphometric values exist across different measurement techniques.
- ImageNet demonstrated higher mean values, potentially impacting glaucoma assessment.
- Ophthalmoscopy showed the lowest correlations, while SSV had the highest with semi-automated devices.