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Schirmer tear test

Measures tear flow. Procedure: - a small piece of filter paper is hooked over the lower set of eyelashes into the conjunctiva - 3-5 minutes is allowed to elapse & the distance tears move onto the paper is measured - the distance is measured from a groove which marks the edge of the conjunctiva Interpretation: - > 20 mm is normal - 9-20 mm is gray zone - < 9 mm is abnormal

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tearing test

References

  1. Harrison's Principles of Internal Medicine, 14th ed. Fauci et al (eds), McGraw-Hill Inc. NY, 1998, pg 1902