TY - JOUR
T1 - Neuroretinal rim measurement error using PC-based stereo software
AU - Eikelboom, Robert
AU - Barry, C.J.
AU - Jitskaia, L.
AU - Voon, A.S.P.
AU - Yogesan, K.
PY - 2000
Y1 - 2000
N2 - 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.
AB - 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.
U2 - 10.1046/j.1442-9071.2000.00298.x
DO - 10.1046/j.1442-9071.2000.00298.x
M3 - Article
SN - 1442-6404
VL - 28
SP - 178
EP - 180
JO - Clinical and Experimental Ophthalmology
JF - Clinical and Experimental Ophthalmology
ER -