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Abstract #3477 Published in IGR 4-2
Reliability of computer-assisted retinal vessel measurement in a population
Sherry LM; Wang JJ; Rochtchina E; Wong T; Klein R; Hubbard L; Mitchell PClinical and Experimental Ophthalmology 2002; 30: 179-182
The purpose of the study was to assess the intergrader and intragrader reliability of computer-assisted retinal vessel diameter measurement in a defined, community-based population. Retinal photographs from participants in the Blue Mountains eye study were digitized using standard techniques. A grader identified all retinal vessels located 0.5-1.0 disc diameter from the optic disc margin, and a computer program measured the width of these vessels. Intergrader and intragrader reliability was assessed on a random sub-sample of 184 and 97 images, respectively, using quadratic weighted kappa (κ) and correlation analysis (R2). Intergrader reliability was high for summary indices of retinal arteriolar (κ = 0.85, R2 = 0.88)and venular (κ = 0.90, R2 = 0.90) diameters, and their ratio, the arteriole-to-venule ratio (κ = 0.75, R2 = 0.79). Intragrader reliability was also high, with κ values ranging from 0.80 to 0.93 and from 0.80 to 0.92 for grades 1 and 2, respectively. It is concluded that the retinal vessel diameters could be reliably measured using computer-assisted software and may be used for population-based research.
Dr. L.M. Sherry, Department of Ophthalmology, Centre for Vision Research, Westmead Hospital, and the Westmead Millennium and Save Sight Institutes, University of Sydney, Sydney, New South Wales, Australia
Classification:
6.11 Bloodflow measurements (Part of: 6 Clinical examination methods)
