Pupil size is an important indicator of a person's state of health. Under fluorescent lighting of the kind that emergency physicians might use, normal pupil sizes range from 2.6 mm to 5 mm. In brighter lighting, normal pupil sizes range from 1.9 mm to 3.6 mm.
Several drugs affect the size of the pupil. For example, atropine eye-drops dilate the pupil and pilocarpine eye-drops constrict it.
Anisomelia is an inequality in size between the pupils of the two eyes, usually a difference of more than 1 mm in diameter.
Related category ANATOMY AND PHYSIOLOGY
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