Optical Angles:
But the eye's optical mechanics are very different from the optical system used to measure a lens. As the eye rotates around its center, the light follows an oblique trajectory that alters the effective power experienced by the wearer. The lens curvature and the corresponding angle of light affect the tilt on the optics and from the perspective of the eye. This tilt creates different angles in different places. Distinct User Power design by Sante Fe Lens compensate every point on the lens surface in such a way that the prescribed Rx is achieved in a larger area.