application_number US 93129978 A description an example of one possible environment in which the invention can be utilized is illustrated by fig1 in which a portion of an aircraft 10 is shown schematically the aircraft 10 is illustrated as including a fuselage 12 defining a cockpit area 14 enclosed by a canopy 16 the cockpit is equipped with a control panel 18 schematically illustrated upon which instrumentation displays of various sorts are mounted the aircraft pilot referred to here as the subject is seated in the cockpit area in a position to visualize a far field of view through the optically transparent medium forming the canopy the subject can also shift his view to the control panel 18 but this normally requires head and eye movement as well as changing his eye focus which may be undesirable according to the present invention a new and improved information display system is provided which superimposes display information in focus on the subject 39 s far field of view the system thereby maximizes the subject 39 s ability to concentrate on the far field of view while making use of information produced by instrumentation in the illustrated embodiment of the invention the system is mounted and supported by a flight helmet 20 worn by the subject as seen in fig2 a the system 21 comprises an optically transparent viewing medium 24 which in the embodiment illustrated is a portion of a helmet visor 22 attached to that medium is a typical display unit 26 for conveying information to the subject and a focusing arrangement 28 for bringing the display unit into focus on.