1. An orientation system for corrective eye surgery comprising: means for performing a first image mapping an eye of a patient in a first position using a predetermined eye feature; means for processing the first image map to determine an edge location of the feature in two dimensions; means for performing a second image mapping of the eye of the patient in a second position different from the first position using the feature; means for processing the second image map to locate the feature; and software means for calculating an orientational change to be applied to a corrective surgical procedure to be performed on the eye with the patient in the second position, the procedure comprising a correction profile determined with the patient in the first position.