What Is Normal Pupil Size?
Last Updated Mar 25, 2020 5:04:24 PM ET
The normal range for pupil size is between 2 and 5 millimeters, although the lighting plays a large part in that spectrum. As people age, their pupils tend to become smaller, according to About.com.
The pupil is that black circle in the center of your eye, in the middle of the colored section, which is called the iris. Light goes through the pupil to reach the retina, which is sensitive to light. The iris grows to make the pupil shrink when the light increases. If pupils remain at different sizes, a visit with a physician should be scheduled, as that can indicate one of several diseases, states About.com.
More From Reference

How to Apply for SNAP Benefits

What Does the Executor of a Will Do?

What Are the Age Limit Restrictions for IRA Contributions?

What Is an Ex-Dividend Date, and How Does It Affect Your Stocks?

What Is the Difference Between Salary and Wages?

How Many Minutes of Daylight Do We Gain Each Day? And Other Daylight Saving Time Facts