Reproducibility of the Optical Biometer OA-1000 (Tomey)
Aim. The OA-1000 (Tomey, Japan) is a new optical biometer, which measures axial length (AL), anterior chamber depth (ACD), and central corneal thickness (CT) utilizing optical interference technology. The aim of this study was to prove the reproducibility which is considered fundamental for other clinical investigations.Methods. 55 healthy volunteers were enrolled in this study. For each measurement of AL, ACD, and CT the biometer is grabbing a sequence of 10 shots and mean value (mean) and standard deviation (SD) are displayed. Five consecutive measurements were performed and average and standard deviation were assessed. Cronbach’sαwas derived as a quality measure for reproducibility.Results. For AL measurement Cronbach’sαwas 1.000, for CT 0.999, and for ACD 0.979, respectively. Mean value for AL was23.36±1.03 mm, for ACD it was3.60±0.687 mm, and for CT it was552.08±29.70 μm, respectively. Standard deviation for AL was0.013±0.022 mm, for ACD0.09±0.11 mm, and for CT2.18±1.75 μm. One correlation was found between mean values for AL and ACD (R = 0.388,P = 0.005); no other correlations were found between mean values or values of standard deviation of AL, ACD, or CT.Conclusion. The OA-1000 shows an excellent reproducibility for measurement of AL, ACD, and CT and can be used in clinical practice.