Abstract: A controlled color source used in testing color vision perception includes a cathode ray tube capable of producing the three primary colors and at least one photo-detector array coupled directly to the tube screen for sensing the primary color output of the screen. The device also includes a microprocessor which processes the photo-detector signals and compares them with stored values having a predetermined correspondence to a desired color output of known hue, saturation, and luminance. The output of the comparison check is used to correct the drive voltage of the electron guns of the cathode ray tube, so that a precise color is displayed by the tube. A subject responds to the displayed color, and the color saturation and hue data are graphically displayed or stored for further use.

Abstract: An apparatus for use in determining the peripheral vision extent of a patient's eye includes a contact lens type construction detachably fitted to the eye having multiple optical fibers each extending to an illuminating source. Upon illumination of a selected fiber, light is directed into the eye and the patient's response noted. The fibers are distributed so as to extend radially outwardly on the lens and thus a patient's responses provide a so-called "map" of peripheral vision extent.

Abstract: A device for monitoring eye attention along an axis includes a telescope directed toward the eye, and a four quadrant photocell detector disposed at the image plane of the telescope. The four photocell outputs are summed to produce X, Y, and common mode signals. These signals are processed to form their absolute values, and are then summed to produce a voltage proportional to deviation of the direction of the eye from the desired axis. This voltage signal is compared with a background illumination signal by an adjustable threshold detector, which actuates a Schmitt trigger to indicate deviation of the attention of the eye.

Abstract: A device for automatically mapping the visual field of a subject includes a concave, generally hemispherical viewing screen, with a plurality of light-conducting fibers extending thereto from the convex side of the screen. The other ends of the light conducting fibers are joined to a light distribution board which includes a pivot supporting a scanning arm. The scanning arm includes a light conducting tube which is adapted to direct a beam of light into individual ends of the light conducting fibers, and the distribution board includes a printed circuit which is used to determine which light conducting fiber is being illuminated. The scanning arm itself is illuminated by a light module which includes an incandescent bulb powered by a regulated source, a continuously variable neutral density wedge, a color filter wheel, and a noiseless shutter. The light module also includes a light thief which samples the illumination provided to the scanning arm to determine the intensity thereof.