The Holladay formula was used to calculate the IOL power when there was a short axial length (< 22.0 mm) and the SRK/T formula was used when there was an average axial length (≥ 22.0 mm). The A-constant used was 119.1 for the Tecnis Z9001 IOL and 118.0 for the ClariFlex IOL. Axial length was measured with the IOL Master (Carl Zeiss Meditec AG), and the targeted postoperative refractive error was 0.0.