Comparison of the different intraocular lens power calculation in cataract patients

Abstract

Objective To evaluate axial length (AL),anterior chamber depth (ACD) ; and intraocular lens (IOL) power calculation using a new optical low-coherence reflectometry biometer( Lenstar LS 900) and compare the results with those obtained with a partial coherence intefferometry optical biometer (IOL Master) and A-type ultrasound scan.Methods Biometry measurements in 80 eyes of 50 subjects scheduled for cataract surgery were done by the same examiner with Lenstar LS 900,IOL Master and A-scan.After determination of AL and ACD,IOL power calculation for an AcryS of SA60 AT (Alcon) was compared between the 3 devices using SRK/T formula.Results For the AL and ACD,there were significant linear correlation between the Lenstar LS 900,IOL Master and A-scan.The mean differences in IOL power calculations were not statistically significant between Lenstar LS 900 and IOL Master ( P ＞ 0.05 ).The Bland-Altman plots showed comparable degrees of agreement in IOL power measurements as determined by SRK/T formules by the 3 devices,especially between Lenstur LS 900 and IOL Master.Conclusion Lenstar LS 900measurements had better agreement with IOL Master and A-scan in cataract eyes.It is an accurate,fast instrument that provides additional information of ocular structure. Key words: Cataract; Biometry; Ocular axial length; Intraocular lens