The system uses the light reflected from the eye falling on a line sensor with photoconductive bit elements. The line sensor provides a first signal level for the light reflected and a second signal for the light reflected by the background of the eye, with the variation point between the 2 signal levels determined for evaluation of the line of sight. A threshold level is set between the 2 signal levels, with detection of 2 bit elements providing outputs above or below the latter for defining a first line. A zero transition bit element is defined by the intersection of this line with the zero line and defines a second line with a lesser gradient and a third line with a greater gradient, their intersection providing the variation point. USE - For accurate measurement of line of sight.
Eye line of sight evaluation system - detects variation point between two signal levels for light reflected by iris and eye background