I know that human eye can change its color during lifetime because of disease or medication (similar question on Biology.SE). And I know that it may change depending on the lighting.

But I saw several times as the eyes of man with the bright eyes changed color (blue/gray/green) without changing environment. Is it possible to temporarily change eye color due to the change of emotional state (as a consequence of the effect of hormones or something else) in just a few of minutes? If so, what are the processes behind this?

Or it just optical/psychological illusion for the observer?

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    $\begingroup$ It is just optical illusion of observer. Eye color cannot change by effect of hormone (somebody correct me if I'm wrong) and not at all in a few minutes. $\endgroup$ – another 'Homo sapien' Apr 21 '16 at 9:21
  • $\begingroup$ In a few minutes? Hardly possible - it will take some time for the pigment cells in the eye to produce and distribute the pigment. $\endgroup$ – Chris Apr 21 '16 at 10:13
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    $\begingroup$ @another'Homosapien', thanks for your comment. $\endgroup$ – Yevhenii M. Apr 21 '16 at 10:43
  • $\begingroup$ Keep in mind blue eyes contain no blue pigment, it is purely a refractory effect. $\endgroup$ – John Aug 8 '18 at 1:03

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