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The cumulative normalised rim/disc area ratio curve
K U Bartz-Schmidt1, A Sengersdorf, P Esser
1Department of Ophthalmology, University of Cologne, Köln, Germany.
Summary
A new normalized rim/disc area ratio curve helps assess optic nerve head damage. This method aids in distinguishing between normal and glaucomatous optic cups, considering optic disc size.
Area of Science:
- Ophthalmology
- Medical Imaging
Background:
- Optic disc cupping assessment is crucial for diagnosing glaucoma.
- Disc area influences the interpretation of optic cup size, complicating diagnosis.
- A normalized rim/disc area ratio curve may differentiate normal from glaucomatous optic cups.
Purpose of the Study:
- To calculate a normalized rim/disc area ratio curve for optic nerve head analysis.
- To develop a method for assessing glaucomatous optic nerve head damage based on optic disc size.
Main Methods:
- Heidelberg Retina Tomograph (HRT) scans of 100 normal subjects' optic nerve heads were analyzed.
- Disc area-adjusted normalized rim/disc area ratios were calculated for 36 sectors.
- Percentile curves (95th, 90th, 50th) were generated for each sector.
Main Results:
- Individual normalized rim/disc area ratio curves can be generated and compared to normal percentile curves.
- The method produced distinct curves for normal, moderate/advanced glaucomatous damage, and small glaucomatous discs.
- This display mode allows for assessment of optic disc size variations.
Conclusions:
- A novel display mode for HRT optic nerve head examinations is presented.
- This method facilitates reliable assessment of glaucomatous optic nerve head damage components.
- The approach accounts for optic disc size, improving diagnostic accuracy.