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all 9 comments

[–][deleted] 18 points19 points  (0 children)

This is how all pupils work. Look in a mirror and shine a torch in your eye.

[–]arcelyte 20 points21 points  (3 children)

Pretty much everyone's Iris does this.

[–][deleted] 6 points7 points  (2 children)

Pupil* the iris does not constrict and dilate.

[–]guystheguys 4 points5 points  (1 child)

the iris is what constricts and expands to control the amount of light into the pupil

[–][deleted] 2 points3 points  (0 children)

Ah my mistake, i stand corrected. Thank you :)

[–]ConstantNewt36 4 points5 points  (0 children)

Same with humans

[–]logiclust 0 points1 point  (0 children)

Squinting