Repeatability and Agreement of Four Biometers for Measuring Various Anterior Segment Parameters.
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Date
2015-05
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Abstract
Purpose: To assess the repeatability and agreement of a new swept source optical coherence tomography (SS-OCT)
biometer (IOL Master® 700, Carl Zeiss Meditec), an optical low coherence reflectometer (Lenstar LS 900®, Haag-Streit
AG, Koeniz, Switzerland), a dual scheimpflug ray tracing biometer (Galilei G6®, Ziemer, Switzerland) and a partial
coherence interferometer, AL scan® (Nidek Co. Ltd., Japan) to measure the keratometry (K), astigmatism (AST), axial
length (AL), anterior chamber depth (ACD), central corneal thickness (CCT) and white-to-white (WTW) in cataractous
eyes in a Cross-sectional study.
Methods: 50 eyes of 50 consecutive patients scheduled for cataract surgery were included. Three consecutive scans were
performed using the 4 biometers by a single operator. Within-subject standard deviation (Sw), test-retest repeatability
and coefficient of variation for assessing repeatability were assessed. Bland-Altman plots for the agreement between the
mean measurements of each machine were examined.
Results: The mean age of patients was 60.2 ± 10.6 years. Dropouts for AL measurement were significantly higher in AL
scan® and Galilei G6® compared to IOL Master® 700. There was good agreement between IOL Master® 700 and Lenstar
LS 900® for AL and keratometry (P < 0.5). High variability was seen between the 4 machines for AST and WTW.
Conclusion: The new SS-OCT biometer showed valid measurements, good repeatability and good agreement with the
optical low coherence reflectometry biometer. The new long range SS-OCT biometer was better than the other three
devices in acquiring AL measurements in denser cataracts due to better penetration.
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Keywords
IOL Master 700, Biometry, SS-OCT
Citation
Kummelil Mathew Kurian, Das Sudeep, Thakkar Maithil, Shetty Rohit, Shetty Bhujang K, Haria Dhawal, Kaweri Luci, Deshpande Kalyani. Repeatability and Agreement of Four Biometers for Measuring Various Anterior Segment Parameters. Journal of Vision Sciences, 2015 May-Aug; 1(2): 9-14.