Agreement of intraocular lens power calculation between 2 SS-OCT–based biometers

PURPOSE To assess agreement of measurements by two swept source optical coherence tomography (SS-OCT) biometers and to evaluate the prediction error (PE) in intraocular lens (IOL) power calculation with seven formulas. SETTING Tertiary public eye hospital. DESIGN Consecutive observational. METHODS Axial length (AL), keratometry (K), anterior chamber depth (ACD), lens thickness (LT), and corneal diameter (CD) were measured with IOL Master 700 (Biometer A) and Anterion (Biometer B). Agreement was quantified by the limits of agreement (LoAs) and concordance correlation coefficient (CCC). The PE, the median absolute error (MedAE), and the mean absolute error (MAE) of the Barrett Universal II (BUII), EVO 2.0, Haigis, Hoffer Q, Holladay 1, Kane, and SRK/T formulas was inverstigated after constant optimization. RESULTS In 78 eyes from 78 patients, excellent agreement was obtained for AL (CCC >0.99), very good agreement for K, ACD, and LT (CCC >0.95), and strong agreement for CD (CCC>0.72). An additive offset of 0.07 mm was measured for ACD and LT whose mean values were higher with Biometer B (p