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The fundamental question that arises from the color composition of the #dressis: 'What are the phenomena that underlie the individual differences in colorsreported given all other conditions like light and device for display beingidentical?'. The main color camps are blue/black (b/b) and white/gold (w/g) anda survey of 384 participants showed near equal distribution. We looked at pupilsize differences in the sample population of 53 from the two groups plus agroup who switched (w/g to b/b). Our results show that w/g and switchpopulation had significantly ( w/g <b/b, p-value = 0.0086) lower pupil sizethan b/b camp. A standard infinity focus experiment was then conducted on 18participants from each group to check if there is bimodality in the populationand we again found statistically significant difference (w/g < b/b , p-value =0.0132). Six participants, half from the w/g camp, were administered dilationdrops that increased the pupil size by 3-4mm to check if increase in retinalilluminance will trigger a change in color in the w/g group, but theparticipants did not report a switch. The results suggest a populationdifference in normal pupil-size in the three groups.

Does normal pupil diameter differences in population underlie the color selection of the #dress?