LAUSR

PURPOSE To evaluate the agreement in biometry measurements and Intraocular lens (IOL) power calculations between two integrated swept-source-optical coherence tomography (SS-OCT) tomography/biometry devices: the Eyestar 900 (Haag-Streit Diagnostics, Koeniz, Switzerland) and the Anterion (Heidelberg Engineering, Heidelberg, Germany). SETTING Tel-Aviv-Medical-Center. DESIGN Retrospective comparative study. METHODS Included were 113 eyes of 66 consecutive subjects who have been evaluated prior to cataract surgery using both devices on the same visit. Measurements of axial length, anterior and posterior keratometry, anterior chamber depth, corneal diameter (CD), central corneal thickness and lens thickness were recorded from both devices and analyzed for agreement and correlation. IOL power calculations using Barrett Universal II Formula were compared between the devices as well as prediction error (PE) and mean absolute error (MAE). RESULTS Mean age was 71.6 ±9.8 years. Clinically, mean differences in measured variables were small. Measurement correlation and agreement between the devices was excellent for all variables, except for CD (Spearman r=0.763, p<0.001, Bland-Altman 95% LOA -0.21 to +0.65mm).Good agreement was found between the devices in IOL power calculations, PE and MAE, and was better when using Eyestar 900 reflective keratometry measurements than Eyestar 900 SS-OCT keratometry measurements (IOL power agreement within ±0.5 D in 90.5% [n=95] and 81.0% [n=85], respectively [p=0.076], and within ±0.25 D in 64.8% [n=68] and 44.8% [n=47], respectively [p=0.005]). CONCLUSION The two integrated SS-OCT tomography/biometry devices had good agreement in biometry measurements and IOL power calculations. Agreement was better when Eyestar 900 reflective anterior keratometry measurements were used rather than Eyestar 900 SS-OCT anterior keratometry measurements. Measurements of CD had reduced agreement and are not interchangeable.