Comparison of anterior corneal curvature measurements using a Galilei dual Scheimpflug analyzer and Topcon auto kerato-refractometer

Purpose. to compare anterior corneal keratometry (k) measurements taken by a dual scheimpflug analyzer and an auto kerato-refractometer. methods. sixty-four normal eyes underwent keratometric measurements with both devices. the repeatability of the auto kerato-refractometer measurements was assessed by calculating the coefficient of variation (cov). the interdevice agreement was evaluated using the bland-altman analysis,pearson correlation coefficient,and paired two-tailed t -test. results. the cov of the flat k and steep k measurements taken by the auto kerato-refractometer were 0.21% and 0.29%,respectively. there were no significant differences between the steep k and average k measurements for the topcon and galilei devices (p = 0.475,and p = 0.137,resp.). the galilei flat k values were lower than those of the topcon (p = 0.002). both of the instruments showed good agreement for all anterior corneal keratometric values. there was a significant linear correlation between the galilei and topcon devices for the flat k (r = 0.989,p < 0.0001),steep k (r = 0.987,p < 0.0001),and average k values (r = 0.994,p < 0.0001). conclusions. the anterior corneal flat keratometric values were not interchangeable between the galilei and topcon devices. however,the measurements of the two instruments showed significant linear correlation with each other. © 2014 xiaogang wang et al.