I thank Tello et al. for their comments. Indeed, our study has confirmed that at present, the use of the anterior corneal astigmatism (ACA) and a predicted posterior corneal astigmatism (PCA) in the Barrett toric formula is yielding slightly better results than the use of the ACA and a measured PCA with Scheimpflug imaging. Tello et al. questioned the proportion of eyes that presented with against-the-rule PCA (ATR-PCA) and with-the rule PCA (WTR-PCA). Table 1 presents the proportion of ATR- PCA and WTR-PCA present in eyes that presented with ATR-ACA and WTR-ACA. In this table, we divided the 122 eyes of this series into having either ATR or WTR astigmatism on the anterior corneal surface and on the posterior corneal surface. Due to the very small number of eyes with oblique astigmatism, we redefined WTR-ACA as having the astigmatic steep axis orientation from 45 to 135 degrees, WTR-PCA as having the astigmatic steep axis orientation from 0 to 45 degrees and from 135 to 180 degrees, ATR-ACA as having the astigmatic steep axis from 0 to 45 degrees and from 135 to 180 degrees, and the ATR-PCA as having the astigmatic steep axis orientation from 45 to 135 degrees.
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