Fig. (3) Bland-Altman plots for the comparison of the magnitude of standard (ΔK) and total (ΔTK) keratometric astigmatism obtained with the IOL-Master (IOLM), Cassini (CAS) and Pentacam (PTC) devices. The dotted lines show the limits of agreement (±1.96SD). Concerning the Pentacam system, the equivalent keratometric astigmatism (EKA) were considered as the total keratometric astigmatism.