A method of re-profiling a cornea of an eye is provided which includes causing ablation energy to be applied across the cornea of the eye and controlling distribution of the ablation energy across the cornea of the eye. The distribution of the ablation energy is controlled by causing the ablation energy to provide an ablation zone, having an optical zone disposed in a central portion of the anterior surface and a transition zone disposed peripherally to the optical zone on an anterior surface of the cornea the ablation zone, and determining a shape of the transition zone by selecting between a cubic spline function and a complementary error function.
