Patent ID: 7771053
Filing Date: 2010-08-10
Classification: G02C

Abstract:
1. A computer-implemented method for use with an aberrometer/wavefront sensor system for determining pupil parameters, comprising the steps of: a) obtaining a pupil image; b) compressing the pupil image by a selected amount, n, and compressing the pupil image by a different selected amount, n c) calculating a threshold value for the compressed pupil image; d) determining a center parameter value of the pupil; e) determining a multiple-coordinate axes diameter parameters of the pupil; f) determining a perimeter shape of the pupil based upon the center and multiple-coordinate axes parameters; g) plotting the shape into the compressed image and determine average pixel signal values inside of the perimeter; h) enlarging the perimeter by a selected amount, Δ, and repeat steps (c, d) on a new image with the enlarged perimeter; i) determining a fringe point position at each end of each of the diameter coordinate axes, and fitting a perimeter shape to the points; j) repeating step (d) on an image obtained from step (i); k) repeating step (g) on the n l) repeating step (h) on the step (k) image, with a Δ m) repeating steps (d, e) on the step (l) image; n) making an eyelid-correction on the step (m) image; and o) repeating steps (d, e) on the step (n) image.