A database was used for entry, validation, and preparation of data for analysis (Excel 2003; Microsoft, Redmond, WA), and another program was used for statistical analysis (SPSS for Windows, ver. 14.0; SPSS, Chicago, IL). Before significance testing, MAE data underwent cube root transformation to satisfy the assumptions of normality and homoscedasticity. P < 0.05 was considered to be statistically significant. Comparison of the postoperative MAE in eyes allocated to PCI versus AUS was performed with Student’s t-test (two-tailed). The χ2 statistic was used to assess the proportional variation of patients achieving an MAE within the dioptric ranges of 0.5, 1.0, 1.5, and 2.0 D, on the basis of the biometric technique. To test the validity of the postoperative refraction, we used Student’s two-tailed t-test to compare the postoperative spherical equivalent refraction in eyes refracted by subjective refraction versus autorefractor.