Patent ID: 6299311
Filing Date: 2001-10-09
Classification: A61B,G01J

Abstract:
A method of measuring a wavefront aberration of an eye, the method comprising:(a) taking image data from the eye, the image data comprising a plurality of spots having positions determined by the wavefront aberration;(b) defining a plurality of search boxes in the image data;(c) determining the positions of the spots by:(i) locating a centroid in each of the search boxes;(ii) replacing each of the search boxes with a search box of reduced size, the search box of reduced size being clipped to fit entirely within the search box which is replaced;(iii) locating the centroid in each of the search boxes of reduced size; and(iv) repeating steps (ii) and (iii) until each of the search boxes of reduced size reaches a minimum size; and(d) calculating the wavefront aberration in accordance with the positions of the spots.