Injections of 0.01% carbachol and 1% acetylcholine chloride (Miochol) into the anterior chamber in round pupil cataract extractions prevent the formation of peripheral anterior synechia but do not preserve the integrity of the vitreous face. Carbachol (0.01%) is as effective for prompt miosis as acetylcholine (1.0%), but the miosis is more prolonged with carbachol.
Beasley H. Miotics in Cataract Surgery. Arch Ophthalmol. 1972;88(1):49-51. doi:10.1001/archopht.1972.01000030051011