miotic
Pronunciation: my-ot-ik
Medication that constricts the pupil by stimulating parasympathetic pathways.
Full Definition
A miotic is a pharmacological agent that causes pupil constriction (miosis) by stimulating parasympathetic nervous system activity or blocking sympathetic activity. Common miotics used in ophthalmology include pilocarpine, carbachol, and cholinesterase inhibitors. These medications are primarily used in glaucoma treatment to improve aqueous humor outflow by opening the trabecular meshwork, and in certain surgical situations to maintain small pupil size. Miotics can also be used diagnostically to test pupillary responses. Side effects may include accommodation spasm, brow ache, and reduced vision in dim lighting conditions.
Usage
Usage note: Distinguish from mydriatics in documentation. Specify drug name and concentration when prescribing.
In Context
- "Pilocarpine, a cholinergic miotic, was prescribed to lower intraocular pressure." — Treatment plan
- "The miotic response was diminished, suggesting possible third nerve palsy." — Neurological assessment