Table 2.
Baseline preoperative characteristics in the two groups
| Parameter | Epithelium-removal CXL group (n=34) | Daya CXL group (n=30) | P |
|---|---|---|---|
| UCVA (logMAR) | 0.55±0.34 | 0.50±0.37 | 0.502 |
| BCVA (logMAR) | 0.20±0.20 | 0.19±0.23 | 0.695 |
| SE (D) | −2.9±3.0 | −3.7±3.1 | 0.183 |
| Front mean K (D) | 45.7±3.28 | 46.5±2.94 | 0.32 |
| Front K-max (D) | 53.8±5.15 | 54.4±5.53 | 0.653 |
| Back K-max (D) | −6.63±2.40 | −6.68±2.48 | 0.131 |
| Apex pachymetry (µm) | 470.5±37.7 | 469.7±33.1 | 0.679 |
| Thinnest pachymetry (µm) | 459.2±37.4 | 460.8±32.7 | 0.708 |
| Min Epi* (µm) | 44.7±5.18 | 44.8±4.95 | 0.945 |
| Max Epi* (µm) | 63.7±7.1 | 63.2±5.1 | 0.858 |
| S* (µm) | 55.9±6.38 | 55.8±4.01 | 0.694 |
| I* (µm) | 55.4±4.97 | 54.6±7.16 | 0.767 |
*Extracted from AS-OCT. CXL: Corneal collagen cross-linking, UCVA: Uncorrected visual acuity, BCVA: Best corrected visual acuity, SE: Spherical equivalent, D: Diopter, Mean K: Mean keratometry, K-max: Maximum keratometry, Min Epi: Minimum epithelial thickness, Max Epi: Maximum epithelial thickness, S: Superior epithelial thickness, I: Inferior epithelial thickness, AS-OCT: Anterior segment-optical coherence tomography