Acetylcholine is used to obtain miosis of the iris in seconds after delivery of the lens in cataract surgery, in penetrating keratoplasty, iridectomy, and other anterior segment surgery where rapid miosis may be required.

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https://dailymed.nlm.nih.gov/dailymed/fda/fdaDrugXsl.cfm?setid=e701ef07-9499-4b56-931f-f4eb3eedbe24&type=display