Patent Document ID: 20050163455
Application ID: 10498455
Patent Status: 0

Claim One:
1. In a method for measuring a wavefront aberration of an eye in which a first, reference, object beam projected parallel to a known reference axis is input to the eye at a first, reference location (P 1 ) on the cornea such that the first beam is scattered from a location ( 1 ) on the retinal surface and further imaged onto a detector at a reference position (x 1 , y 1 ), and at least a sequential, second object beam parallel to and displaced a known amount (d) from the reference beam is projected into the eye at a second location (P 2 ) on the cornea, is scattered from a location ( 2 ) on the retinal surface and further imaged onto the detector at a second position (x 2 , y 2 ), such that a displacement (Δx 2-1 , Δy 2-1 ) can be measured and from which wavefront aberration information can be calculated, the improvement characterized by, inputting a third beam corresponding to each sequential second beam at an angle (α) to the reference axis that enters the cornea at the same location as each second beam (P 2 ) and is scattered from a location ( 3 ) on the retinal surface substantially corresponding to location ( 1 ) and further imaged onto the detector at a third position (x 2 , y 2 ), such that a displacement (Δx 3-1 , Δy 3-1 ) can be measured and the wavefront aberration calculated corresponding to location P 2 on the cornea, whereby the wavefront aberration for cornea location P 2 from the third beam data is more accurate than the corresponding measurement from the second beam measurement.