What is the average range of pupil size in room light?

The average range of pupil size in room light is typically between 2.5 mm and 5.0 mm. In well-lit conditions, pupils tend to constrict to optimize vision by reducing the amount of light that enters the eye. This range encompasses variations among individuals, where factors such as age, health, and lighting conditions can slightly influence pupil diameter. Understanding normal pupil size is crucial in drug recognition, as deviations from this range may indicate the influence of substances that affect the autonomic nervous system, thereby impacting pupil size.