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Related Experiment Videos

Corneal sensation after topical anesthesia.

K Nomura1, D E Singer, J V Aquavella

  • 1Department of Ophthalmology, University of Rochester School of Medicine, New York, USA.

Cornea
|March 15, 2001
PubMed
Summary

Four percent lidocaine provides a significantly longer corneal anesthetic effect compared to tetracaine and bupivacaine. This study compared topical anesthetics for corneal sensitivity in healthy eyes.

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Area of Science:

  • Ophthalmology
  • Anesthesiology

Background:

  • Topical anesthetics are crucial for ophthalmic procedures.
  • Understanding the duration of action for agents like tetracaine, lidocaine, and bupivacaine is important for clinical practice.

Purpose of the Study:

  • To compare the duration of topical anesthetic effects of tetracaine, lidocaine, and bupivacaine on corneal sensitivity.
  • To evaluate combinations of tetracaine with lidocaine or bupivacaine.

Main Methods:

  • Corneal touch sensitivity was measured using a Cochet-Bonnet anesthesiometer in 17 healthy volunteers.
  • Participants were randomized into five groups receiving different concentrations and combinations of tetracaine, lidocaine, and bupivacaine.
  • Measurements were taken at 2.5-minute intervals until baseline sensitivity returned.

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Main Results:

  • No significant difference in anesthetic duration was observed between tetracaine (0.5%), bupivacaine (0.75%), and their combination.
  • Both 4% lidocaine alone and its combination with 0.5% tetracaine demonstrated significantly longer anesthetic effects compared to tetracaine and bupivacaine alone (p < 0.005).

Conclusions:

  • Four percent lidocaine offers a significantly prolonged topical anesthetic effect on the cornea compared to tetracaine and bupivacaine.
  • Lidocaine, particularly at 4%, may be a preferred agent when extended corneal anesthesia is desired.