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Simulated cup/disc ratio: a tool for ophthalmologists.

Carolina Pelegrini Barbosa¹, Pedro Felipe Angelini, Paulo Schor

¹Ophthalmology Department, Escola Paulista de Medicina, Universidade Federal de São Paulo - UNIFESP, São Paulo, SP, Brazil. carolepm@gmail.com

Arquivos Brasileiros De Oftalmologia

|October 15, 2010

Summary

Observers showed good overall agreement in measuring cup/disc ratios (CDR), but struggled with intermediate values. This highlights challenges in accurately assessing glaucoma progression using CDR simulations.

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Area of Science:

Ophthalmology
Medical Imaging
Glaucoma Diagnosis

Background:

Accurate measurement of the cup-to-disc ratio (CDR) is crucial for diagnosing and monitoring glaucoma.
Simulations are used to train and assess observers' ability to measure CDR.

Purpose of the Study:

To evaluate and compare observer performance in measuring simulated cup-to-disc ratios (CDR) as both concentric and non-concentric circles.
To identify potential discrepancies in CDR measurements across different values and orientations.

Main Methods:

A prospective, randomized, and masked study involving 171 participants.
43 simulated images of CDRs ranging from 0.2 to 0.9 were presented on a computer screen.
Both vertical and horizontal CDR measurements were assessed.

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Main Results:

Satisfactory overall agreement was observed, with kappa coefficients of 0.755 (horizontal) and 0.730 (vertical).
Lin's concordance correlation coefficients were R=0.88 (horizontal) and R=0.86 (vertical).
Very poor agreement was found for intermediate CDR values (0.4-0.6), with kappa coefficients below 0.45.

Conclusions:

While general agreement for CDR measurement is adequate, absolute agreement for intermediate values is poor.
This indicates a significant challenge for observers in accurately quantifying CDR in the intermediate range.
Further research may be needed to improve observer training and measurement techniques for glaucoma assessment.