APPARATUS AND METHOD FOR OBJECTIVE MEASUREMENT AND CORRECTION OF OPTICAL SYSTEMS USING WAVEFRONT ANALYSIS

摘要

A method for enhancing vision of an eye includes a laser delivery systemhaving a laser beam for ablating corneal material from the cornea of the eye.Measurements are made to determine an optical path difference between a planewave and a wavefront emanating from the retina of the eye for a location at asurface of the cornea. An optical correction is provided to the laser deliverysystem for the location based on the optical path difference and refractiveindicesof media through which the wavefront passes. The optical correction includesdividing the optical path difference by a difference between an index ofrefractionof corneal material and an index of refraction of air. The laser beam isdirected tothe location on the surface of the cornea and corneal material ablated at thelocation in response to the optical correction to cause the wavefront toapproximate the shape of the plane wave at that location.