What term describes pupillary constriction?

The correct term that describes pupillary constriction is miosis. This term specifically refers to the condition where the pupils become smaller in diameter. Miosis is a physiological response that can occur in various situations, such as in bright light or as part of a reaction to certain stimuli or medications.

Understanding the other terms is also important for context. Myopia refers to a common vision condition, often known as nearsightedness, where distant objects appear blurry. Hyperopia, or farsightedness, is the opposite condition where close objects are difficult to focus on. Ptosis refers to the drooping of the upper eyelid, which is unrelated to pupil size or constriction. Thus, miosis is the only choice that accurately represents the phenomenon of pupillary constriction.