What is considered a normal pupil diameter measured in millimeters?

A. Normal adult pupils measure 3 to 5 mm in diameter in ambient light. Pupils are round, equal, and reactive to light and accommodation. B. Pupils in this range are considered miosis (abnormally constricted) and may result from opioid use, neurologic disorders, or bright light exposure. C. While partially overlapping with the normal range, 2 mm is slightly below the typical adult baseline. This range is less precise than 3–5 mm and may include abnormal constriction. D. Pupils in this range are considered mydriasis (abnormally dilated) and can indicate neurologic injury, drug effects, or low-light conditions.