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[Healthy optic discs with large cups--a diagnostic challenge in glaucoma]
C Y Mardin1, F Horn, A Viestenz
1Augenklinik mit Poliklinik der Universität Erlangen-Nürnberg, Erlangen. christian.mardin@augen.imed.uni-erlangen.de
Klinische Monatsblatter Fur Augenheilkunde
|April 28, 2006
Summary
Large optic discs with big cups are often misdiagnosed as glaucoma by automated analysis. This study shows that morphometric analysis systems can falsely identify large discs as glaucomatous, necessitating improved diagnostic methods.
Area of Science:
- Ophthalmology
- Medical Imaging
- Glaucoma Diagnostics
Background:
- Automated morphometric analysis frequently mischaracterizes healthy optic discs with large cups as glaucomatous.
- Investigating laser scanning tomography (LST) and nerve fiber polarimetry variables in large-cup optic discs is crucial for accurate diagnosis.
Purpose of the Study:
- To compare LST and nerve fiber polarimetry variables in healthy optic discs with large cups versus normal-sized discs.
- To identify factors contributing to misdiagnosis of glaucoma in large optic discs.
Main Methods:
- Analysis of 117 eyes from the Erlangen Glaucoma Registry using planimetry, HRT I, and GDx FCC.
- Comparison of 63 eyes with large cups against 54 normal eyes, with measurements analyzed globally and by sector.
Main Results:
- Discs with large cups had significantly larger areas than normal discs.
- Multivariate analysis revealed significant correlations between disc area and HRT/GDx measurements, indicating a high rate of false positives for large discs.
- Cup area and volume correlated strongly with disc size, unlike rim parameters.
Conclusions:
- Large optic discs with enlarged cups, reduced nerve fiber thickness, and altered rim ratios are prone to false glaucoma detection by automated systems.
- Improved diagnostic accuracy requires better representation of large discs in normative databases and integration of sector and disc area data into multivariate analysis.