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Tear breakup time and the Schirmer tear test
Journal of the American Optometric Association
|December 1, 1976
Summary
Tear film breakup time (BUT) is not a reliable indicator of tear quantity. A study found that BUT measurements do not correlate with tear volume, suggesting other tests are needed for accurate assessment.
Area of Science:
- Ophthalmology
- Optometry
- Tear film dynamics
Background:
- The tear film is crucial for maintaining ocular surface health and visual function.
- Accurate assessment of tear quantity is essential for diagnosing and managing dry eye disease.
Purpose of the Study:
- To evaluate the correlation between tear film breakup time (BUT) and tear quantity measured by the Schirmer tear test.
- To determine if BUT can serve as a surrogate indicator for tear production.
Main Methods:
- A cohort of 40 optometric students was analyzed.
- Tear film breakup time (BUT) was measured.
- Schirmer tear test was performed to assess tear quantity.
Main Results:
- The analysis demonstrated no significant correlation between tear film breakup time (BUT) and the results of the Schirmer tear test.
- BUT measurements were found to be an unreliable indicator of tear quantity in the study population.
Conclusions:
- Tear film breakup time (BUT) should not be utilized as a measure of tear quantity.
- The Schirmer tear test remains a more appropriate method for assessing tear production.