Intraobserver and interobserver reproducibility of the Nidek EAS-1000 Anterior Eye Segment Analysis System

The NIDEK EAS-1000 is a camera and computer system designed to facilitate measurement and analysis of the anterior segment of the eye. To evaluate the interobserver reproducibility of the system, three examiners assessed the anterior chamber depth and peripheral angle measurement in 20 disease-free eyes. Intraobserver reproducibility was determined by each investigator's photographing and analyzing the same eye on three different occasions. Interobserver correlation for the anterior chamber depth (using the first three readings of the same eye made by each examiner) was 0.97, with an 95% CI of 0.94 to 0.98. Interobserver correlation for angle measurement (again using the first three readings of the same eye made by each examiner) was 0.89, with a 95% confidence interval (CI) of 0.81 to 0.95. Intraobserver correlations for anterior chamber depth were 0.98 for each of the three examiners (mean, 0.98), wiht a 95% CI of 0.91 to 0.99. Intraobserver correlations for anterior chamber depth were 0.98 for each of the three examiners (mean, 0.98), with a 95% CI of 0.91 to 0.99. The intraobserver CI for angle measurement was 0.97 (range, 0.95 to 0.99). The intraobserver and interobserver reproducibility of the NIDEK EAS-1000 system was excellent.