Pre- and 18-month postoperative results (±1 SD) in treated eyes (n=22) corneal wave-front higher-order aberrations
| Parameter | Preoperative (μm) | 18 months (μm) | Difference (μm) | p Value |
| Root mean square | 3.15±1.72 | 2.97±1.55 | −0.18 | 0.01 |
| Coma | 2.78±1.76 | 2.63±1.59 | −0.15 | 0.03 |
| Trefoil | 0.89±0.41 | 0.81±0.28 | −0.08 | 0.2 |
| Spherical aberration | 0.11±0.54 | 0.03±0.62 | −0.08 | 0.03 |
| Secondary astigmatism | 0.63±0.32 | 0.54±0.27 | −0.09 | 0.004 |
| Quatrefoil | 0.27±0.2 | 0.23±0.15 | −0.04 | 0.06 |
| Secondary coma | 0.31±0.21 | 0.27±0.19 | −0.04 | 0.07 |
| Secondary trefoil | 0.19±0.16 | 0.16±0.13 | −0.03 | 0.2 |
| Pentafoil | 0.10±0.08 | 0.08±0.07 | −0.02 | 0.05 |