Comparison Of Measurements Obtained By An Optical Low Coherence Interferometry Biometer (Lenstar) And A Swept Source Oct Biometer (Anterion)
Published 2023 - 41st Congress of the ESCRS
Reference: PP22.13 | DOI: 10.82333/jfb1-pz06
Authors: Chris Ashton* 1 , Mana Rahimzadeh 1 , Valerie Saw 1
1Imperial College NHS Trust,London,United Kingdom
Accurate biometry measurements are essential in calculating intraocular lens power for cataract surgery, and new devices using different optical principles are available. It is helpful to cross check unusual biometry findings on more than one device, and it is therefore essential to establish how similar the measurements are, between devices. The purpose of our study was to compare similarity of biometry measurements between the Lenstar, which uses optical low coherence reflectometry, and Anterion, which uses swept source OCT technology.
Data was collected at Imperial College NHS Trust.
Axial length (AL), flat (K1) and steep (K2) keratometry, anterior chamber depth (ACD), lens thickness (LT) and white to white (WTW) data was collected retrospectively between November 2021 and June 2022 from both devices. All patients with high quality scans on both devices awaiting cataract surgery were included. Patients with previous corneal surgery, laser refractive surgery and pterygium were excluded. The correlation between instruments was calculated by Pearson’s correlation test. Intraclass correlation coefficient (ICC) with 95% confidence intervals was used to compare intradevice consistency. Bland-Altman plots were used to assess the agreement between measurements.
A total of 153 eyes from 106 patients (60 female, 46 male) with a mean age of 69.8 +/-12.9 years, ranging from 25 - 95 years were included in the study. AL and K1 showed excellent to good similarity between the instruments, but WTW reproducibility was poor. There was no statistical difference between AL and K1 between the biometers. Statistical differences between the biometers were found for ACD, K2, LT and WTW.
The Lenstar and Anterion showed similarity between devices for most measurements. The devices showed similar measurements for AL and K1, but statistical differences between ACD, K2, LT and WTW. These findings have implications particularly for short eyes with axial length < 22mm, where inclusion of ACD, LT and WTW in the lens calculation formula can result in a clinically significant difference in calculated IOL power.