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A method for measuring neuroretinal rim area.

A J Simpson¹, S Lee, K J Hanna

¹Visual Science Unit, Radcliffe Infirmary, UK.

Australian and New Zealand Journal of Ophthalmology

|May 1, 1990

Summary

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A new method accurately measures neuroretinal rim area (NRA) using stereo fundus photographs and digital analysis. This technique offers reliable NRA quantification for optic nervehead assessment.

Area of Science:

Ophthalmology
Medical Imaging
Computational Biology

Background:

Accurate measurement of the optic nervehead's neuroretinal rim area (NRA) is crucial for diagnosing and monitoring glaucoma.
Existing methods for NRA quantification can be subjective or lack precision.

Purpose of the Study:

To describe and validate a practical, digital method for measuring the neuroretinal rim area (NRA) from stereo fundus photographs.

Main Methods:

Sequential stereo fundus photographs were captured using a Zeiss fundus camera.
Manual tracing of optic disc and cup margins on transparencies overlying the photographs.
Digitization of tracings and analysis using an edge detection algorithm to calculate NRA.

Main Results:

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The intraobserver intraphotograph coefficient of variation for NRA measurements ranged from 1.6% to 7.2% across varying optic disc topographies.
The method demonstrated good reproducibility for NRA quantification.

Conclusions:

This digital tracing and edge detection method provides a practical and reproducible approach for measuring neuroretinal rim area.
The technique facilitates objective assessment of optic nervehead morphology, aiding in glaucoma diagnosis and management.