Miosis is a medical condition that causes excessive constriction of the pupil, leading to reduced responsiveness to light. This condition is often a result of certain medications, diseases, or injuries. Synonyms for miosis include pinpoint pupils, small pupils, contracted pupils, and constricted pupils. Pinpoint pupils are often associated with opiate use and are a common indicator of an overdose. Constricted pupils can also be a sign of parkinsonism or other central nervous system disorders. Small or contracted pupils may also occur due to certain medications such as antipsychotics, and antidepressants. Overall, these synonyms are used interchangeably to describe the same medical condition of miosis.