Which pupil reaction is indicative of miosis?

Miosis refers to the constriction of the pupils. When the pupils constrict, they become smaller in diameter, which is a physiological response to various stimuli, including increased light exposure, certain medications, or autonomic nervous system activity. This reaction is often associated with a heightened focus on nearby objects and can also be a sign of specific medical conditions or drug ingestion.

The other reactions mentioned, such as pupil dilation or irregularity, indicate different states of pupil response that are not part of miosis. Pupil dilation refers to mydriasis, where the pupils enlarge, often in low light conditions or due to certain drugs. Pupil stasis does not provide any movement or change in size, whereas irregularity suggests an abnormal shape or reaction, which also does not pertain to the typical physiological condition of miosis. Understanding these distinctions reinforces the definition of pupil reactions and their significance in medical assessments.