Comparative Analysis Of Two Optical Biometry Devices In Terms Of Axial Length And Keratomery

 To compare measurements agreement between Lenstar LS900 based on optical low-coherence reflectometry (OLCR) biometry and EyeStar based on swept-source optical coherence tomography (SS-OCT) biometry.

 Private hospital, Ishwar Eye Centre, Haryana, India.

Design:  Diagnostic technology assessment

Methods: This was a comparative diagnostic technology assessment study in which 208 eyes of 104 subjects was takes as sample size.  Axial length (AL) and keratometry (K1, K2) measurements were performed using both biometry devices. Analysis used SPSS software, paired t test and Bland Altman plots.

Mean ± SD of axial length(mm) measurement in Lenstar was 23.84 ± 1.32 and in Eyestar was 23.97 ± 1.87 with no significant difference between them. (p value=0.191). Mean ± SD of K1 (Diopter) measurement in Lenstar was 42.98 ± 1.78 and in Eyestar was 42.98 ± 1.84 with no significant difference between them. (p value=0.876), Mean ± SD of K2 (Diopter) in Lenstar was 43.95 ± 1.94 and in Eyestar was 43.97 ± 1.94 with no significant difference between them. (p value=0.371)

Our results implicate a very good agreement in measurements  of AL and Keratometry values (K1,K2) between Lenstar LS900 and Eyesstar, though both use different technologies. There was no statistically significant difference between measurements of two devices.  The Eyestar matches the results of  Lenstar , which is the current gold standard of optical biometry.