of the drive shaft not shown of galvanometer motor 3164 the output of position sensor 3166 is differentiated at differentiator 3168 to provide the velocity of the drive shaft of motor 3164 this velocity is summed with the error from eye movement sensor 100 the sum is integrated at integrator 3160 and input to current amplifier 3162 to drive galvanometer motor 3164 as the drive shaft of motor 3164 rotates mirror 310 the error that eye movement sensor 100 measures decreases to a negligible amount the velocity feedback via position sensor 3166 and differentiator 3168 provides servo controller motor driver 316 with the ability to react quickly when the measured sensor error is large light energy reflected from eye 10 as designated by reference numeral 101 r travels back through optics 300 and beamsplitter 200 for detection at sensor 100 sensor 100 determines the amount of eye movement based on the changes in reflection energy 101 r error control signals indicative of the amount of eye movement are fed back by sensor 100 to beam angle adjustment mirror optics 300 the error control signals govern the movement or realignment of mirrors 310 and 320 in an effort to drive the error control signals to zero in doing this light energy 101 t and beam 502 are moved in correspondence with eye movement while the actual position of beam 502 relative to the center of the pupil is controlled by x y translation mirror optics 520 in order to take advantage.