Abstract: An apparatus and method for simulating the loss of vision in a subject, which occurs for example under sustained high "G" loading, using an optical element 12 such as a visor with variable optical characteristics ranging from opaque to transparent. An oculometer 18 monitors at least one of the subject's eyes and provides a signal representative of its line of sight. This signal is fed to a computer 56 which calculates a pattern of opacity, light scattering transmissivity and transparency and controls the screen accordingly to produce such a pattern simulative of the visual effects which occur during loss of vision.

Abstract: A means of simulating loss of peripheral vision and the eventual total black-out experienced by a pilot, undergoing high acceleration forces while maneuvering an aircraft is disclosed. The simulation is achieved by modifying the pilot's helmet by incorporating thereon a variable optical device which when excited causes a reduction of pilot vision. The reduction in vision is progressive, in direct proportion to the level of excitation applied, which excitation itself is directly proportional to the acceleration forces simulated.