Felis ISSN 2398-2950

Schirmer tear test

Synonym(s): STT

Contributor(s): Ralph Hamor, Peter Renwick, David Williams, Alison B Clode

Introduction

  • Method of measuring the amount of tears produced per unit time.
  • Tears produced cause wetting of standard test strips due to basal and reflex tearing (when performing traditional STT, or STT I).

Uses

  • Method of diagnosis of hyposecretion by the lacrimal and nictitans glands.
  • Detection of keratoconjunctivitis sicca (KCS) Eye: keratoconjunctivitis sicca.
  • Evaluation of response of KCS to lacrimogenic or parasympathomimetic agents.

Disadvantages

  • Some normal animals may have a low STT. Need to correlate results with clinical signs and test suspicious animals frequently to monitor for trends.
  • Does not detect qualitative tear film deficiency, which is deficiency in lipid or mucin components of tear film. Animals with qualitative deficiency may have signs attributable to an unhealthy tear film, but may still have normal STT.

Requirements

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Preparation

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Procedure

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Further Reading

Publications

Refereed papers

  • Recent references from PubMed and VetMedResource.
  • McLaughlin S A, Brightman A H 2nd, Helper A C et al (1988) Effect of removal of lacrimal and third eyelid glands on Schirmer tear test results in cats. JAVMA 193 (7), 820-822 PubMed.

Other sources of information

  • Gelatt K N, Gilger B C, Kern T (eds) (2013) Ocular Examination and Diagnostic techniques. In: Veterinary Ophthalmology. 5th edn. John Wiley & Sons, Ames, Iowa.
  • Severin G A (1996) Examination of the Eye. In: Severin's Veterinary Ophthalmology Notes. 3rd edn.
  • Moore C P (1990) Qualitative Tear Film Disease. In: Vet Clin North Am Small Anim Pract Small Anim Ophthalmol. Millichamp & Dziezyc (eds).
  • Petersen-Jones S & Crispin S (2002) BSAVA Manual of Small Animal Ophthalmology. 2nd edn. British Small Animal Veterinary Association. ISBN 0 905214 54 4


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