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Neuroretinal rim measurement error using PC‐based stereo software
Author(s) -
Eikelboom Robert H,
Barry Chris J,
Jitskaia Ludmila,
Voon Angel Sp,
Yogesan Kanagasingam
Publication year - 2000
Publication title -
clinical and experimental ophthalmology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.3
H-Index - 74
eISSN - 1442-9071
pISSN - 1442-6404
DOI - 10.1046/j.1442-9071.2000.00298.x
Subject(s) - medicine , reproducibility , glaucoma , software , standard deviation , stereopsis , mean difference , optometry , ophthalmology , artificial intelligence , statistics , mathematics , computer science , confidence interval , programming language
The neuroretinal rims of a set of glaucoma patients were measured using digitized stereo photographs, to determine the reproducibility of computerized stereo measurements of the neuroretinal rim. Each rim was measured five times at 18 locations, with measurement error (ME) defined as the mean of standard deviations of each set of measurements. The following ME were determined: (i) inter‐sessional variability ( n = 27 right and 24 left eyes, at t 1 and t 2 ); (ii) inter‐assessor variability ( n = 9, 2 assessors); and (iii) variability after colour adjustment algorithms were applied ( n = 15). The results were as follows: (i) inter‐sessional variability was 3.41 ± 1.08 for t 1 and 3.22 ± 0.84 for t 2; ; (ii) there was a significant difference between the two assessors, although the ME was still low; and (iii) there was no significant differences between the ME of unadjusted and adjusted images. With a measurement error of up to 11% of rim width, these results show that low‐ cost rim measurements can be made using PC‐based software.