An experiment was conducted to determine the influence of three variables on the perception of the psychophysical phenomenon of flicker in wide angle cathode ray tube (CRT) displays. The three independent variables treated in the experiment were: 3, 6, and 9 foot-lambers (FL) illumination levels; four images, three static and one dynamic; and 26 fixation points positioned around a display from 0 to 120 in the horizontal axis and 60 to 90 up the vertical axis. Recorded measures in the factorial experiment consisted of: time to first observation of flicker, percentage of the total number of trials that flicker was observed, and the severity of flicker regarding its interference with a visual task. Conclusions drawn from the experiment were: 1) flicker will probably be encountered at all illumination levels between 3 and 9 FL; 2) the most prominent flicker effects will be encountered when fixating at a point 30 from the source of illumination with flicker being observed out to 120 horizontally and to +90 /-60 vertically; 3) each individual is fairly consistent in his sensitivity to flicker. (Author/MC)