Repeatability in biometric parameters measured with two swept-source optical coherence tomography biometers and one optical low coherence reflectometry biometer
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First Author: A.Fisus AUSTRIA
Co Author(s): N. Hirnschall M. Ruiss C. Pilwachs O. Findl
Aim of this study is to determine the repeatability of ocular biometric parameters (axial length - AL, keratometry, anterior chamber depth/aqueous depth - ACD/AQD, lens thickness - LT) obtained using three biometry devices, two swept-source optical coherence tomography (ss-OCT) biometers and an optical low coherence reflectometry (OLCR) device.
Vienna Institute for Research in Ocular Surgery, Hanusch Hospital, Vienna, Austria
This prospective, observational study included 50 eyes of 50 patients examined prior to cataract surgery. Each patient was measured three times with each device: two ss-OCT: IOLMaster 700 (biometer A, Carl Zeiss, Medited AG, Jena, Germany) and ANTERION (biometer B, Heidelberg Engineering GmbH, Heidelberg, Germany) and an OLCR, Lenstar LS 900 (biometer C, Haag-Streit AG, Koenitz, Switzerland). Patients with age-related cataract and no other significant ocular comorbidities that could influence the measurements were included. Repeatability was assessed using within-subject standard deviation (Sw) and coefficient of variation (CoV).
The Sw values for AL were 0.105 mm for biometer A, 0.010 mm for biometer B and 0.084 mm for biometer C. For steep and flat keratometry the Sw was 0.233/0.194 diopters (D) for biometer A, 0.039/0.146 D for biometer B and 0.186/0.193 D for biometer C. For ACD/AQD and LT the Sw was 0.039 mm and 0.012 mm for biometer A, 0.003 mm and 0.038 mm for biometer B while, 0.135 mm and 0.182 mm for biometer C. While the CoV was less than 0.90% for all parameters investigated, exception being AQD and LT for biometer C, (less than 2%).
All three biometers showed a good repeatability for the biometric parameters investigated. The ss-OCT biometers showed a slightly better repeatability compared to the OLCR biometer in the case of AQD and LT.
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