Intermediate
Technical
IVT
mydriatic
A pharmacological agent that dilates the pupil by paralyzing the iris sphincter muscle.
Full Definition
Mydriatics are medications used in ocular surgery to achieve pupil dilation (mydriasis) for improved surgical visualization. Common mydriatics include tropicamide, cyclopentolate, and atropine. These agents work by blocking acetylcholine receptors in the iris sphincter muscle, causing pupil dilation that can last from hours to days depending on the specific agent used. Proper mydriatic selection is crucial for surgical planning and patient safety.
Usage
Usage note: Do not confuse with 'miotic' which has the opposite effect of constricting the pupil.
In Context
- "The surgeon administered tropicamide as a mydriatic agent thirty minutes before the procedure." — Surgical preparation note
- "Postoperative mydriatic effects may persist for several hours following cataract surgery." — Patient discharge instructions
Also known as
pupil dilator
mydriatic agent
Contrasted with
miotic
Don't confuse with
cycloplegic
miotic