Statistical analysis
IOL
HORNER, IOL, PLUMMER
The sample of eyes included in this study had to be of adequate size, relative to the goals of the study. For the determination of the required sample size for the study described in this protocol, data from a preliminary study (6 months of follow-up) conducted at 9 sites in Europe (142 patients) aimed at evaluating and comparing the visual outcomes in eyes implanted with the modified aspheric monofocal IOL Tecnis Eyhance ICB00 and with the monofocal IOL Tecnis ZCB00 were considered. The Dupont and Plummer approach was used for the sample size calculation [Statistical analyses were performed with a commercially available software package (SPSS for Mac, Version 20.0; IBM Corporation, Armonk, NY, USA). Normality of data samples was evaluated by means of the Kolmogorov–Smirnov test. When parametric analysis was possible, the Student Concerning refraction notation, the power vector method described by Thibos and Horner was used for converting the preoperative and postoperative spherocylindrical refractions [