While your pupils normally open (dilate) in low light and grow smaller (constrict) in bright light, they also naturally get smaller as you age — this is not a sign for concern.

What considered small pupils?

A fully dilated pupil is typically in the 4 to 8 millimeters in size, while a constricted pupil is in the 2 to 4 mm range. According to the American Academy of Ophthalmology, pupils generally range in size from 2 to 8 mm.

What is a normal pupil size?

The normal pupil size in adults varies from 2 to 4 mm in diameter in bright light to 4 to 8 mm in the dark. The pupils are generally equal in size. They constrict to direct illumination (direct response) and to illumination of the opposite eye (consensual response). The pupil dilates in the dark.