Fig. 4.

Variability of Repeated Measures. Variability here is the standard deviation for a group of triplicate measures (except for 3 eyes which were duplicate measures). The bold face number is the mean of the standard deviations of repeated measures with the associated range shown in parentheses. The keratometric power (SimK for topography, keratometric equivalent power for SDOCT, and EKR for Scheimpflug photography) is listed first and then the anterior radius below it. Pooled standard deviations have been used in other works to describe repeatability. For comparison, the repeatability of SDOCT keratometric power in our population as expressed by pooled standard deviation is 0.14 D.