The purpose of this paper is to provide a designer or systems analyst a guide to human performance limitations in vision when fixation must be redirected from one display to another. The focus is on large angular separation (greater than 20 deg) and on tasks wherein speed is of importance. Patterns of eye and head movements are shown, as well as quantitative data on saccades, periods of eyelhead compensation, and head movement. Independent variables include interdisplay angle, display visibility, operator's knowledge of display location, and some relevant characteristics of a possible task which must be interrupted for the refixation. Intersubject and intrasubject variability are also presented.
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