Evaluation of the Schirmer tear test

Area of Science:

• Ophthalmology
• Ocular Surface Disease
• Tear Film Research

Background:

• Accurate measurement of tear production is crucial for diagnosing and managing dry eye disease.
• The Schirmer test is a commonly used method for assessing tear secretion.
• Variability in test results can impact clinical diagnosis and research findings.

Purpose of the Study:

• To evaluate the reliability of the Schirmer filter paper test for measuring tear production.
• To assess the day-to-day variability of tear production measurements in healthy women.
• To determine if local anesthetic drops affect the reliability of the Schirmer test.

Main Methods:

• 10 healthy women participated in the study.
• Tear production was measured using the Schirmer filter paper test.
• Measurements were taken daily for 30 or 31 consecutive days after instillation of local anesthetic drops.

Main Results:

• The Schirmer test demonstrated significant variability in tear production measurements within the same subjects.
• Many participants exhibited results that, by standard interpretation, indicated inadequate tear production.
• Day-to-day fluctuations in tear production were observed even under controlled conditions.

Conclusions:

• The Schirmer filter paper test is not a reliable indicator of tear production.
• High variability suggests potential limitations in its diagnostic accuracy for dry eye.
• Further research is needed to explore more consistent methods for tear production assessment.