Abstract
The work has been presented at The Association for Research in Vision and Ophthalmology (ARVO) Annual Meeting, Fort Lauterdale, Florida, May 1999.
Purpose:
To evaluate inter- and intraobserver variability of the R/D score in assessing the iris configuration in Pigment Dispersion Syndrome patients.
Methods:
Fifty-seven high-resolution ultrasound biomicroscopy images were obtained by a single ophthalmologist. All images were examined twice by each of three ophthalmologists, the second assessment being at least 2 weeks after the first. Each observer was masked to their colleagues’ and their previous measurements. R/D scores were calculated at each examination. Agreement between and amongst observers was assessed using Bland-Altman plots. In addition, the R/D scores were categorised and reassessed using the Kappa statistic.
Results:
Intraobserver variability was small, the average differences between first and second scores of each observer being less than 0.01 units. Agreement within observers was 89% or higher, with Kappa values of 0.8 or higher, indicating almost perfect agreement. Interobserver variability was, however, greater. Although there was substantial agreement between two of the observers (87% agreement, first assessment; 80%, second assessment with respective kappa statistics of 0.78 and 0.66), they only moderately agreed with the other observer (kappa statistics between 0.55 and 0.68).
Conclusions:
This study suggests that when using R/D scores to demonstrate changes in iris configuration, assessments should preferably be made by the same observer.
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Source: Pubmed