Comparison of two swept-source optical coherence tomography-based biometry devices.

PURPOSE To compare two swept-source optical coherence tomography (SS-OCT) biometers, IOLMaster 700 (biometer A, Carl Zeiss Meditec AG), and ANTERION (biometer B, Heidelberg Engineering GmbH). SETTING Vienna Institute for Research in Ocular Surgery - Karl Landsteiner Institute, Hanusch Hospital, Department of Ophthalmology, Vienna, Austria. DESIGN Retrospective study. METHOD Cataract patient biometric measurements performed between June and July 2019 were reviewed. Patients scheduled for cataract surgery were measured with both SS-OCT devices on the same day. The following biometry parameters were compared: keratometry, central corneal thickness (CCT), anterior chamber depth (ACD), lens thickness (LT) and axial length (AL). RESULT In total, 389 eyes of 209 subjects were measured with both devices. The mean absolute difference between the keratometry data of the two devices was 0.04 ± 0.05 mm (7.80 ± 0.26 mm for biometer A and 7.82 ± 0.26 mm for biometer B; p<0.0001) for the steep keratometry readings, and 0.04 ± 0.04 mm (7.63 ± 0.26 mm and 7.65 ± 0.25 mm; p<0.0001) for the flat keratometry readings. For ACD and LT the mean absolute difference was 0.07 ± 0.04 mm and 0.07 ± 0.04 mm. The mean absolute difference for AL was 0.02 ± 0.03 mm (23.55 ± 1.18 mm for biometer A and 23.54 ± 1.18 mm for biometer B; p< 0.0001). CONCLUSION Good agreement was found between the two devices, with a minor offset for ACD and LT measurements. Although differences were found to be small, the devices should not be used interchangeably.