Patent ID: 6022107
Filing Date: 2000-02-08
Classification: A61B

Abstract:
A process for determining the topography for bioelectrical eye reaction signals to light stimuli, depending upon the location of each light stimulus on the retina, with a surface placed before the eye, on which a light emitting image is portrayed for the stimulation, consisting of surface segments, where each surface segment is lighted and darkened, depending upon a digital time function assigned to it, and at the same time the total reaction of the eye is measured and in which, from the total reaction of the eye, by calculating the cross-correlation function with the digital time function, the components of the reaction functions of the eye assigned to each surface segment is determined, where, for the measurement, any number above a minimum value of similar time intervals, closed in themselves, is used, each of which provides a partial result which can be evaluated, in connection with which, for each time interval, complete m sequences are used, as a digital time function, preferably negated and extended by one additional step, where for each surface segment the same m sequence cyclically displaced by at least one step is used, and the additional step is inserted in all m sequences, in parallel at the same point in time and, for each time interval, the reaction function of each surface segment is calculated by forming the cross-correlation function and by adding up the reaction functions of multiple surface segments, at least one sum function is formed, with which the quality of the measurement of the time interval is evaluated and, an overall function is formed for each surface segment for further use, in order to reduce measurement errors by adding up the reaction functions for each measurement evaluated as good for a time interval.