1. Apparatus for evaluating eye dominance in a human subject comprising: at least one display for presenting at least one target image and at least one masking image, each having separately controllable contrast; a viewer for directing one of said images selectively to only a first eye of said subject and for directing one of said images selectively to a second eye of said subject; an image controller for causing the contrast of the target image to increase with time while the contrast of the masking image decreases or does not increase with time; at least one subject response acceptor for receiving a subject response to visual detection of said target image; a computing and data processing control unit configured to coordinate said display, said viewer, and said image controller and record response times for image viewing sequences by a subject.