Biophysical bases of keratorefractive surgical techniques applicable to myopic human eyes

In this study, we have shown that: (a) the refractive power of the optical system of the myopic human eye could be decreased either by increasing the radius of curvature of its anterior corneal surface or decreasing that of its posterior corneal one, (b) a certain increase in the radius of curvature of the anterior corneal surface of the myopic eye results in a much greater decrease in the refractive power of its cornea than an equal decrease in that of its posterior corneal surface can do, and, (C) the decision that the surgical operation which aims at decreasing the refractive power of the optical system of the myopic eye is performed on its anterior corneal surface in the keratorefractive surgical techniques is a reasonable one from the physical and biophysical points of view in that the increase in the radius of curvature of the anterior corneal corneal surface of the myopic eyes provides a wider range for the correction of the refractive errors in the optical systems of these eyes than a decrease in that of their posterior corneal surface can do