Abstract
The illumination and pupillary dilation requirements for calibration on an eyegaze response interface computer aid (ERICA) were studied. The purpose of this study was to determine whether decreases in ambient illumination level would facilitate calibration and increase the probability of use by subjects. Monocular versus binocular calibration was also studied to determine whether the occlusion of one eye would cause the pupil of the other to dilate, therefore allowing the use of a higher level of illumination during calibration. Twenty subjects (10 monocular and 10 binocular) were tested at four ambient illumination levels (10, 50, 100, and 210 lux) in both ascending and descending orders of presentation. Analyses of frequency and pupil diameter data revealed a statistically significant increase in calibration at lower levels of illumination. An increased frequency of calibration for monocular (versus binocular) viewing conditions was also found.
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