Pupilometrics indicates that pupils dilate when the eyes are focused on a pleasurable object and contract when focused on one that is not pleasurable.

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Pupilometrics is the measurement of changes in pupil size in response to different stimuli. Studies have shown that pupils tend to dilate in response to pleasurable stimuli and contract when focused on something that is not pleasurable or uncomfortable.

Pupilometrics Indicates That Pupils Dilate When the Eyes Are Focused