Characteristics | PRK-CXL group (n = 40) | PRK group (n = 42) | P |
---|---|---|---|
Age, years old | 25.8 ± 5.7 (20 to 38) | 25.1 ± 4.6 (20 to 36) | .542 |
Sex (% women) | 43Â % | 38Â % | .717 |
Refractive errors (D) | |||
 Spherical | –5.46 ± 1.20 (–7.50 to–3.00) | –5.78 ± 1.22 (–8.00 to–2.62) | .233 |
 Cylindrical | –1.44 ± 0.73 (–2.62 to 0) | –1.27 ± 0.83 (–3.25 to 0) | .321 |
 Spherical equivalent | –6.18 ± 1.28 (–8.12 to–3.50) | –6.42 ± 1.17 (–8.75 to–3.81) | .385 |
Keratometric value | |||
 Flat K | 42.3 ± 1.1 (40.3 to 44.3) | 42.6 ± 1.3 (39.3 to 44.8) | .242 |
 Steep K | 44.1 ± 1.2 (41.0 to 46.0) | 44.2 ± 1.5 (41.0 to 47.0) | .748 |
Preoperative CDVA | 1.00 ± 0.02 (1.00 to 1.00) | 1.01 ± 0.04 (1.00 to 1.00) | .160 |
Preoperative UDVA | 0.04 ± 0.03 (0.01 to 0.15) | 0.04 ± 0.02 (0.02 to 0.10) | .755 |
Optical zone (mm) | 6.36 ± 0.23 (5.80 to 6.90) | 6.32 ± 0.16 (6.00 to 6.70) | .280 |
Total ablation zone (mm) | 8.10 ± 0.28 (7.45 to 8.64) | 8.17 ± 0.36 (7.66 to 9.00) | .335 |
Ablation depth (μM) | 101.54 ± 19.65 (54.13 to 128.68) | 97.71 ± 20.56 (48.54 to 146.94) | .391 |
CCT (μM) | 510.2 ± 32.9 (460.0 to 590.0) | 537.8 ± 23.2 (501.0 to 610.0) | <.001 |