Repeatability of biometry measured by three devices and its impact on predicted intraocular lens power.

PURPOSE:To compare the repeatability of ocular biometry measured with the LENSTAR LS 900, IOLMaster 700, and Anterion and its impact on predicted intraocular lens (IOL) power. SETTING:Tertiary eye-care facility in South India. DESIGN:Prospective, observational, cross-sectional study. METHODS:Eyes diagnosed with cataract had 3 consecutive scans on each biometers. The repeatability was assessed using the within-subject standard deviation (Sw), test-retest repeatability, and coefficient of variation (CoV). The agreement was evaluated with the intraclass correlation (ICC). The IOL power was calculated with the Barrett Universal II formula. RESULTS:The study comprised 127 eyes of 76 patients. The repeatability of all parameters for a given device were excellent (ICC >0.9, low CoV and Sw). The agreement of the parameters between the biometers was very good (range from 0.93 to 0.99). The predicted IOL power differed statistically between the devices (P < .05), but the difference was clinically insignificant between the 3 biometers (ICC >0.99 for repeat calculation of IOL power). CONCLUSIONS:All the biometers included in the study had good to excellent repeatability of biometry parameters. The agreement of the predicted IOL power was excellent between the 3 optical biometers.