Certified Paraoptometric (CPO) Practice Exam 2025

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What is the onset time for Proparacaine?

  1. 5-10 seconds

  2. 10-30 seconds

  3. 30-60 seconds

  4. 1-3 minutes

The correct answer is: 10-30 seconds

Proparacaine is a topical anesthetic commonly used in ophthalmology. Its onset time is typically rapid, falling within the range of 10 to 30 seconds after application. This quick onset makes Proparacaine particularly effective for procedures requiring immediate local anesthesia, such as tonometry or foreign body removal. While some anesthetics might have longer onset times, Proparacaine is known for its relatively fast action, allowing healthcare providers to proceed with eye examinations and procedures without significant delays. The other options, while reflecting plausible onset times for different types of anesthetics, do not accurately match the specific pharmacological profile of Proparacaine.

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