Table 2.
The changes in mean different parameters between the baseline and at 1-year after collagen cross-linking
| Parameters | Mean (SD) | P | |
|---|---|---|---|
| Before CXL | After CXL | ||
| UCVA (logMAR) | 0.52 (0.30) | 0.46 (0.27) | 0.045 |
| BCVA (logMAR) | 0.23 (0.16) | 0.21 (0.18) | 0.13 |
| K-max (D) | 52.29 (5.80) | 51.94 (6.01) | 0.003 |
| CCT | 473.22 (40.59) | 466.29 (43.85) | <0.001 |
| Deviation index | 6.81 (2.98) | 7.02 (2.82) | <0.001 |
| Corneal asphericity (Q value) | −0.71 (0.46) | −0.63 (0.55) | 0.001 |
| ARC | 6.98 (0.57) | 7.07 (0.57) | <0.001 |
| PRC | 5.28 (0.54) | 5.26 (0.57) | <0.001 |
| ISV | 66.25 (30.97) | 64.23 (31.37) | 0.006 |
| IVA | 0.705 (0.38) | 0.67 (0.38) | 0.009 |
| KI | 1.17 (0.10) | 1.15 (0.11) | <0.001 |
| CKI | 1.037 (0.03) | 1.035 (0.04) | 0.023 |
| IHA | 27.17 (22.28) | 26.37 (24.49) | 0.463 |
| IHD | 0.093 (0.05) | 0.086 (0.05) | <0.001 |
CXL: Corneal collagen cross-linking, SD: Standard deviation, UCVA: Uncorrected visual acuity, BCVA: Best corrected visual acuity, K-max: Maximum keratometry, CCT: Central corneal thickness, ARC: Anterior average radii of curvature, PRC: Posterior average radii of curvature, ISV: Index of surface variance, IVA: Index of vertical asymmetry, KI: Keratoconus index, CKI: Central keratoconus index, IHA: Index of height asymmetry, IHD: Index of height decentration