Table 4.
Change in total wavefront aberration and retinal image quality parameters by groups
| Parameter | FS-CRI group | Pa value | Cohen’s dz | TICL group | Pa value | Cohen’s dz | ||
|---|---|---|---|---|---|---|---|---|
| Preoperative | Postoperative | Preoperative | Postoperative | |||||
| T. Spherical aberration (µm) |
0.023 ± 0.018 (0.018–0.028) |
0.041 ± 0.034 (0.032–0.050) |
< 0.001 | 0.498 |
0.023 ± 0.019 (0.018–0.028) |
0.033 ± 0.026 (0.026–0.040) |
0.003 | 0.42 |
| T. Coma (µm) |
0.062 ± 0.033 (0.053–0.071) |
0.093 ± 0.066 (0.076–0.111) |
0.003 | 0.521 |
0.053 ± 0.036 (0.044–0.063) |
0.073 ± 0.051 (0.059–0.087) |
0.018 | 0.33 |
| T. Trefoil (µm) |
0.095 ± 0.046 (0.083–0.107) |
0.193 ± 0.121 (0.161–0.226) |
< 0.001 | 0.840 |
0.108 ± 0.056 (0.093–0.123) |
0.155 ± 0.076* (0.134–0.176) |
< 0.001 | 0.656 |
| T. HOA (µm) |
0.142 ± 0.045 (0.130–0.154) |
0.258 ± 0.111 (0.228–0.288) |
< 0.001 | 0.966 |
0.149 ± 0.056 (0.133–0.164) |
0.208 ± 0.082 (0.185–0.230) |
< 0.001 | 0.695 |
| Strehl ratio |
0.000 ± 0.000 (0.000–0.000) |
0.037 ± 0.024 (0.031–0.044) |
< 0.001 | 1.539 |
0.000 ± 0.000 (0.000–0.000) |
0.052 ± 0.039 (0.041–0.063) |
< 0.001 | 1.323 |
| Area ratio (%) |
10.48 ± 0.11 (10.45–10.51) |
33.66 ± 9.73 (31.05–36.22) |
< 0.001 | 2.382 |
10.55 ± 0.26 (10.48–10.62) |
38.91 ± 11.34 (35.85–41.98) |
< 0.001 | 2.516 |
FS-CRI group = femtosecond laser-assisted corneal relaxing incisions with implantable collamer lens implantation; TICL group = toric implantable collamer lens implantation; T = Total; HOA = high-order aberration.aComparison between the preoperative and postoperative values.*P<0.05, significantly different between the FS-CRI group and the TICL group.Cohen’s dz is the effect size for paired comparisons, calculated as the mean difference divided by the standard deviation of the difference scores ( dz = Mdiff / SDdiff).