Table 1. Baseline demographic characteristics, visual, refractive, keratometric, pachymetric values, and cone location of the patients in the CCXL group and ACXL group.
| Parameters | CCXL (32 eyes, 32 patients) | ACXL (27 eyes, 27 patients) | P |
| Age (y) | 23.13±3.8 | 24.69±5.0 | 0.494 |
| Sex (male:female) | 20:12 | 17:10 | 0.311 |
| Visual acuity (logMAR) | |||
| UDVA | 0.74±0.6 | 0.61±0.5 | 0.520 |
| CDVA | 0.23±0.2 | 0.19±0.1 | 0.539 |
| Refractive error (D) | |||
| MR sphere | -3.4±4.8 | -3.3±5.2 | 0.757 |
| MR cylinder | -3.8±2.6 | -3.2±2.0 | 0.220 |
| MRSE | -5.4±5.4 | -5.1±5.5 | 0.837 |
| Pentacam parameters | |||
| Kmax (D) | 54.7±7.3 | 56.0±5.4 | 0.357 |
| Km (D) | 48.3±4.2 | 48.7±4.7 | 0.778 |
| Ks (D) | 50.1±4.8 | 50.7±5.0 | 0.599 |
| Kf (D) | 46.8±3.8 | 46.9±4.6 | 0.988 |
| Kas (D) | 3.2±1.9 | 3.8±2.0 | 0.454 |
| CCT (µm) | 463.9±31.3 | 457.8±42.3 | 0.518 |
| TCT (µm) | 445.4±37.2 | 439.1±45.0 | 0.420 |
| Cone location, n (%) | |||
| Central | 28 (87.5) | 23 (85.2) | 0.227 |
| Paracentral | 4 (12.5) | 4 (14.8) | 0.309 |
| Keratoconus grade, n (%) | |||
| Grade I | 18 (56.3) | 14 (51.9) | |
| Grade II | 9 (28.1) | 10 (37.0) | |
| Grade III | 2 (6.2) | 0 | |
| Grade IV | 3 (9.4) | 3 (11.1) |
CCXL: Conventional corneal collagen crosslinking; ACXL: Accelerated corneal collagen crosslinking; UDVA: Uncorrected distance visual acuity; CDVA: Corrected distance visual acuity; MR: Manifest refraction; MRSE: Manifest refraction spherical equivalent; Kmax: Maximum keratometry; Km: Mean keratometry; Ks: Steep keratometry; Kf: Flat keratometry; Kas: Keratometric astigmatism; CCT: Central corneal thickness; TCT: Thinnest corneal thickness.
mean±SD