Department of Ophthalmology, Medical Health and Science Center, University of Debrecen, Debrecen, Hungary.
Sixty healthy eyes of 41 patients were enrolled in a study. The central ACD was measured 5 times with AS-OCT (Visante, Carl Zeiss Meditec) using its chamber tool and 5 times with a US A-scan device (UltraScan Imaging System, Alcon Laboratories) using an immersion method. The measurements were performed consecutively by 2 independent observers.
The mean ACD measured with AS-OCT was 3.12 mm ± 0.33 (SD) by observer 1 and 3.11 ± 0.33 mm by observer 2 (P = .78). The repeatability was 0.8 % ± 0.4 % and 1.9 % ± 1.4 % , respectively. The reproducibility was 0.23 % . The reliability coefficient with AS-OCT was 99.6 % . The mean ACD measured with immersion US A-scan was 2.98 ± 0.33 mm by observer 1 and 2.95 ± 0.34 mm by observer 2 (P = .68) . The repeatability was 6.4 % ± 3.8 % by observer 1 and 8.5 % ± 4.9 % by observer 2. The reproducibility was 0.88 % . The reliability coefficient was 87.1 % for US A-scan measurements. The difference between ACD values with AS-OCT and values with US A-scan was statistically significant (P = .02). The correlation (r) between AS-OCT and US A-scan was 0.732 (P<.0001) by observer 1 and 0.802 (P<.0001) by observer 2.
Anterior chamber measurements were significantly deeper with AS-OCT than with US immersion A-scan. Repeatability of ACD measurements was better with AS-OCT than with immersion US, and reproducibility was equal with the 2 methods.