*in situ*keratomileusis (LASIK) patients [1112]. Therefore, angle kappa and the location of the VA must be considered from the perspective of postoperative visual outcomes.

### Materials and Methods

### Subjects

### Preoperative and postoperative ophthalmologic examination and surgical procedures

### Analysis of the relative location of centers

### Statistical analysis

*t*-tests. A

*p*-value of <0.05 was considered statistically significant.

### Results

### Baseline and femtosecond laser-related characteristics

*p*< 0.001). The mean preoperative astigmatism was 1.10 ± 0.75 D, while the mean 1-month postoperative astigmatism was 0.70 ± 0.27 diopters, indicating a significant decrease in astigmatism (

*p*= 0.013). The mean angle kappa value was 5.14 ± 1.63°. Tables 1 and 2 summarize pre- and postoperative clinical data. The mean CCC diameter measured by femtosecond laser software was 4.83 ± 0.13 mm. A paired arcuate incision was performed in 71.4% of all eyes.

### Distance of centers from the lens center

*p*= 0.036), the difference between the distance from the LC to the lens center and from the VA coordinates to the lens center was 0.091 ± 0.227 mm (

*p*= 0.024), and the difference between the distance from the VA coordinates to the lens center and the distance from the PC to the lens center was 0.149 ± 0.34 mm (

*p*< 0.001). The PC was closest to the lens center, whereas the LC and VA were farther away on multiple comparisons analysis (Table 3 and Fig. 5A, 5B).

### Distance of centers from the VA

*p*= 0.125). According to the mean value, the PC tends to be located closest to the lens center compared to the other centers, but this difference was not statistically significant (Table 4 and Fig. 5).

### Location between the centers based on the lens center and the VA

*p*= 0.004, horizontal

*p*< 0.001) (Table 5 and Fig. 6A–6C). Based on the location of the lens center, the LC was significantly inferior and temporal in location compared to the PC (chi-square test, vertical

*p*= 0.026, horizontal

*p*= 0.023). Coordinate values of t he PC, LC and VAequal to t he vertical and horizontal coordinates of the lens center were excluded from data analysis.

*p*= 0.310, horizontal

*p*= 0.926) (Table 6 and Fig. 7A–7C).

### Angle kappa and distance between centers

*p*= 0.017) (Table 7). Larger angle kappa is associated with greater PC-VA distance (β = 0.401). Considering the definition of angle kappa, this result can be easily understood. However, other distances between centers had no significant linear correlations with angle kappa (Table 7). To clarify the relationship between angle kappa and distances between centers, we set the angle kappa value based on a cutoff criterion of 5°. Distances between centers were not significantly correlated with angle kappa (Table 8).