The action of proparacaine stas within?
2 minutes
5 minutes
15 minutes
20 minutes
Ans. A. 2 minutesProparacaine and tetracaine are indicated to produce local anesthesia of sho duration for ophthalmic procedures including measurement of intraocular pressure (tonometry), removal of foreign bodies and sutures, and conjunctival and corneal scraping in diagnosis and gonioscopy.Onset of action:* Proparacaine--Within 20 seconds.* Tetracaine--Approximately 15 seconds.Duration of action:* Proparacaine--15 minutes or longer.* Tetracaine--10 to 20 minutes; average 15 minutes.