The human eye must be pointed very accurately at detail of interest if this detail is to be seen with maximum clarity. The physiological eye-pointing servo is a vital, not incidental, part of human vision. The neuromuscular system that controls eye direction is very highly developed. It has been suggested that this neuromuscular system might be used, in certain appropriate cases, as a new means by which man can control a man/machine system. That is, that the eye muscles be used in place of, or in addition to, conventional hand action. In this way man's capability for action in high performance man/machine systems might be usefully extended. In order to apply the concept to eye control, it is necessary to have a transducer (oculometer) that can measure eye direction without interfering with the human subject.