Are my small pupils normal?Īverage sized pupils generally range from 2 to 8 millimeters. This size varies based on the amount of light in the environment:īright light – Pupils normally dilate to between 4 and 8 millimeters in size. Low light – Pupils normally constrict to between 2 and 4 millimeters in size. Pupils also typically get smaller when focusing on nearby objects and grow larger when focusing on faraway objects.īoth pupils may be the same size, but some people have pupils of different sizes ( anisocoria). In some cases, however, anisocoria can be a sign of a serious problem, such as a viral infection, an issue with the nervous system or an eye injury or condition. Pupil size changes naturally with age - this is totally normal. In newborns, for instance, pupil size is much smaller, though size increases as a child grows, becoming largest in adolescence. During the teen years and throughout adult life, pupils shrink. In older adults, pupils are smaller when at rest in the dark and slower to dilate in response to light.
One study measured pupil size at different light levels and across different age groups. The results show that, in the right eye, average pupil size ranges from 2.41 to 5.80 millimeters in people ages 15 to 30 and from 2.38 to 4.52 millimeters in those over 60 years of age.
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