APPARATUS AND METHOD FOR MEASURING VISION DEFECTS OF A HUMANEYE

摘要

Optical characteristics of optical systems, such as the eye (14), are measur ed including vision defects of the eye using a collimated beam (12) from a diod e laser (66) focused onto the anterior surface (22) of the cornea (24) of the eye for providing a finite source (16) of secondary radiation on the retina (18) of the eye, the image of which is close to a desired diffraction limite d spot. The secondary radiation is reflected back from the retina (18) as a reflected wavefront of radiation that passes through the eye and is directed onto a wavefront analyzer (42) where distortions associated with the reflect ed wavefront are measured. By focusing on the cornea (24) through a long focal length lens (70) and thus converging the beam through a small angle (13), as opposed to typically focusing a collimated light onto the retina (18), the need for lenses or lens combinations, and the time required to adjust such t o accommodate the differing vision of each patient is eliminated.