Related Experiment Videos
A modified Schirmer test: the fine-thread method for measuring lacrimation.
Journal of Pediatric Ophthalmology
|November 1, 1977
Summary
A novel cotton thread method offers a faster and gentler alternative for measuring tear production, improving upon the traditional Schirmer test for diagnosing lacrimal deficiency.
Area of Science:
- Ophthalmology
- Diagnostic Methods
Background:
- The Schirmer test is a standard method for assessing tear production.
- Conventional Schirmer testing utilizes filter paper, which can be time-consuming and potentially irritating.
Purpose of the Study:
- To introduce and evaluate a modified Schirmer test using fine cotton thread.
- To compare the efficacy and patient comfort of the new thread method against the traditional filter paper method.
Main Methods:
- A fine cotton thread, stained with fluorescein, is inserted into the conjunctival sac for 5-30 seconds.
- The soaked portion of the thread is measured in millimeters, with comparisons made between both eyes.
- Multiple consecutive measurements are taken to account for natural tear variability.
Main Results:
- The cotton thread method is significantly faster (5-30 seconds vs. 5 minutes).
- It is less injurious to the eye and provides a more stable measurement.
- The method allows for simultaneous fluorescein dye disappearance/dilution tests and is suitable for children.
Conclusions:
- The fine cotton thread method is a superior alternative to the conventional Schirmer test for diagnosing lacrimal deficiency.
- This innovative technique offers improved speed, patient comfort, and diagnostic accuracy.