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Post illumination pupil response (PIPR) metrics to 1 s and 5 s long wavelength (red) and short wavelength (blue) stimuli before (solid bars) and after (open bars) wearing blue blocking glasses at night-time for 2 weeks. (a) normalised minimum pupil diameter, (b) area under the curve (AUC), (c) 6 s PIPR, and (d) 30 s PIPR. * indicates P < 0.05.
