| Means ± SD Range | PRK | LASIK | ||||
| Pre-operative | Post-operative | P value | Pre-operative | Post-operative | P value | |
| Spherical equivalent (D) | −3.16 ± 1.75 −1.0 to −8.25 | +0.02 ± 0.37 –2.0 to+1.25 | *** | −5.58 ± 1.98 −2.0 to −10.0 | +0.04 ± 0.33 −0.5 to +1.0 | *** |
| Visual acuity (decimal) | 0.13 ± 0.11 | 1.02 ± 0.2 | *** | 0.06 ± 0.049 | 0.96 ± 0.15 | *** |
| Axial length (mm) | 24.79 ± 1.02 22.5 to 28.36 | 24.70 ± 0.1 22.43 to 28.28 | *** | 25.67 ± 1.35 23.03 to 28.37 | 25.60 ± 1.33 23.0 to 28.32 | *** |
| K reading (D) | 43.50 ± 1.61 40.43 to 48.8 | 40.26 ± 2.09 31.87 to 45.94 | *** | 43.36 ± 1.46 40.35 to 46.61 | 38.26 ± 2.94 31.9 to 41.95 | *** |