Equis ISSN 2398-2977

Eye: topical anesthesia

Contributor(s): Dennis E Brooks, Graham Munroe, John Parker

Introduction

  • The corneal and conjunctival surfaces of the eye have a large amount of nerve endings which results in intense pain following inflammation or trauma to these areas.
  • Topical local anesthetics applied to the cornea and conjunctival surfaces are an effective method of decreasing pain and facilitating examination/surgical procedures.

Uses

  • Decrease resistance of animal to examination procedures, eg corneal cytology scrapes   Cornea / conjunctiva: scraping  .
  • Facilitate minor surgical procedures of the eye, eg biopsy of corneal or conjunctival lesion   Eye: biopsy  .
  • Stop ocular pain derived from cornea or conjunctiva possibly preventing self mutilation.
  • May help differentiate corneal pain from intraocular pain (no effect).

Advantages

Disadvantages

  • Nearly all available drugs inhibit corneal epithelial healing and may propagate corneal damage.
  • Most drugs cause transient stinging and conjunctival hyperemia.
  • Indiscriminate use may cause corneal damage.
  • Some drugs deteriorate after the container is opened and need to be kept refrigerated - single use disposable vials are preferred.

Requirements

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Preparation

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Procedure

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Further Reading

Publications

Refereed papers


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