The accuracy and stability of post-op visual acuity were improved, at 3 month after surgery, residual SE remained within ±1.0 D, the residual SE changes from 1 week to 3 months were not greater than 0.10 D There were no significant differences in the mean corneal flap thickness (106 µm of femto versus 107 µm of OUP) and the mean central corneal flap thickness (105 µm versus 105 µm) between Femto laser and control group.