Repeatability of two swept-source optical coherence tomography biometers and one optical low coherence reflectometry biometer.

Aim To compare the repeatability of two swept-source optical coherence tomography biometers (ss-OCT), IOLMaster 700 (biometer A, Carl Zeiss Meditec AG), and ANTERION (biometer B, Heidelberg Engineering GmbH) and one optical low-coherence reflectometry device (OLCR) (Lenstar, LS900, Haag-Streit AG). Setting Vienna Institute for Research in Ocular Surgery - Karl Landsteiner Institute, Hanusch Hospital, Department of Ophthalmology, Vienna, Austria. Design Prospective study that included patients scheduled for cataract surgery. Method Three consecutive measurements were performed with two ss-OCT devices and one OLCR device. The repeatability of the following biometry variables was compared: keratometry, central corneal thickness (CCT), anterior chamber depth (ACD), lens thickness (LT) and axial eye length (AL). To assess the repeatability of each parameter the within-subject standard deviation (Sw) and coefficient of variation (CoV) were calculated. Result Fifty eyes of 50 patients were included. The CoV values were below 0.5 for all variables, except for ACD and LT for biometer C. The Sw values for mean keratometry were 0.018 for biometer A, 0.083 for biometer B and 0.137 for biometer C. For ACD the Sw values were 0.039 and 0.004 for biometer A and biometer B respectively and 0.134 for biometer C. For the AL the values were 0.006 for biometer A, 0.008 for biometer B and 0.012 for biometer C. Conclusion All biometry devices included in the analysis presented a high repeatability. The ss-OCT devices showed a higher repeatability performance compared to the OLCR device.