pupillary sphincter

(redirected from Iris sphincter muscle)
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Related to Iris sphincter muscle: Iris dilator muscle
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.pupillary sphincter - a ring of smooth muscle surrounding the iris
eye, oculus, optic - the organ of sight
anatomical sphincter, sphincter, sphincter muscle - a ring of muscle that contracts to close an opening
References in periodicals archive ?
Cyclopentolate is an agent, used in eye examinations and treatments, that temporarily paralyzes the ciliary muscle, which is responsible for accommodation, and the iris sphincter muscle, which reduces the pupil size.