mydriasis
Pronunciation: mid-RYE-ah-sis
Pupil dilation, often induced pharmacologically for surgical procedures or examination.
Full Definition
Mydriasis refers to the dilation or enlargement of the pupil, which can occur naturally in low light conditions or be induced pharmacologically using mydriatic agents. In ophthalmic surgery, mydriasis is routinely achieved preoperatively to provide adequate visualization and access to intraocular structures. Common mydriatic agents include tropicamide, cyclopentolate, and phenylephrine. The degree and duration of mydriasis can affect surgical planning and patient postoperative experience. Inadequate mydriasis may complicate surgical procedures and require additional pharmacological intervention.
Usage
Usage note: Contrast with miosis (pupil constriction) in clinical documentation.
In Context
- "Adequate mydriasis was achieved with tropicamide 1% and phenylephrine 2.5%." — Preoperative preparation note
- "The patient experienced prolonged mydriasis lasting 8 hours postoperatively." — Postoperative follow-up