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on the characters or figures on the CRT display. Thus, the size, color, flicker, resolution and other factors involved with the characters have been studied from many different standpoints4,5). CRT polarity has been much discussed as well. The oft-used negative displays, for example, have a low mean luminance which results in a large luminance contrast between the bright characters and dark display background. The resulting greater visual load has been pointed out in the literature6). There has yet to be any published study on the effects on pupillary area of factors such as polarity or target-size. In the present study, we compared positive and negative CRT display conditions, varying the size of the target in the center of the screen, to determine the effect on the pupil area.

The Effect of VDT Polarity and Target Size on Pupil Area.