Table 1.
Baseline patient characteristics
| GROUP I (30 eyes) | GROUP II (30 eyes) | P value | |
|---|---|---|---|
| Age | 26 ± 4.7 (20 to 39) | 27.8 5.2 (21 to 37) | 0.14 |
| Gender: male/female | 9 M/6F | 8 M/7F | 0.16 |
| Preoperative manifest sphere diopter (D) | −2.5 ± 1.2 (−5.25 to −0.75) | −2.8 ± 1.01 (−5.0 to −0.5) | 0.14 |
| Preoperative cylinder (D) | −0.8 ± 0.46 (−2.0 to −0.25) | −0.6 ± 0.49 (−2.0 to −0.25) | 0.13 |
| Preoperative SE (D) | −2.45 ± 1.09 (−4.25 to −0.75) | −3.0 ± 1.07 (−5.5 to −0.5) | 0.06 |
| Preoperative k1(D) | 43.9 ± 1.08 (40.8 to 45.66) | 43.75 ± 1.4 (41.39 to 46.2) | 0.58 |
| Preoperative k2(D) | 42.87 ± 1.15 (40.9 to 44.94) | 43.07 ± 1.4 (40.44 to 45.36) | 0.57 |
| Preoperative Q(4.5 mm) | −0.38 ± 0.11 (−0.7 to −0.2) | −0.36 ± 0.11 (−0.6 to −0.1) | 0.91 |
| Preoperative pachymetry(μm) | 546.71 ± 36.48 (489 to 623) | 558.3 ± 40.4 (509 to 655) | 0.33 |
| Preoperative total aberrations(μm) | 4.88 ± 1.6 | 5.2 ± 1.9 | 0.66 |
| Preoperative HOA(μm) | 0.37 ± 0.1 | 0.36 ± 0.1 | 0.48 |
| Preoperative vertical coma(μm) | 0.01 ± 0.2 | 0.02 ± 0.2 | 0.54 |
| Preoperative horizontal coma(μm) | 0.17± 0.4 | 0.2 ± 0.6 | 0.06 |
| Preoperative SA(μm) | 0.16 ± 0.3 | 0.2 ± 0.3 | 0.16 |
Abbreviations: D diopter, (k1,k2) the steep and the flat keratometric readings, Q corneal asphericity, SE spherical equivalent, HOA high order aberrations, μm micron SA spherical aberrations