Equis ISSN 2398-2977

Lacrimal gland: schirmer tear test

Contributor(s): Keith Barnett, Dennis E Brooks, Graham Munroe

Introduction

  • Testing tear production as part of the complete ophthalmic examination procedure .
  • Two techniques:
    • Schirmer I tear test is most commonly employed, where no topical local anesthetic solution is used and a stimulated (reflex) tear production is being assessed.
    • Schirmer II tear test involves the use of topical anesthesia and blotting the conjunctival sac dry before beginning measuring.

Uses

  • Few disorders of the pre-ocular tear film have been recognized in the horse (keratoconjunctivitis sicca is rare ) but the test should be used in examining cases with chronic ulcerative keratitis   Keratitis: overview  or keratoconjunctivitis.

Advantages

  • Simple procedure.
  • Cheap.

Disadvantages

  • Slightly subjective assessment with large 'grey area' between normal and abnormal.

Requirements

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Preparation

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Procedure

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Further Reading

Publications

Refereed papers


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