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The pupils can constrict (miosis) and dilate (mydriasis)
Mydriasis = bigger word = bigger pupil.

Constriction is a PARASYMPATHETIC function (tiny relaxed happy pupils)

Dilation is a SYMPATHETIC function (eyes wide with fear)
Pupils constrict in response to LIGHT and NEAR

Pupils dilate in response to DARKNESS and ADRENERGIC TONE

Drugs can also affect the pupils as can prior trauma/surgery
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