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Related Experiment Videos

A new thread tear test using silicone tubing.

K Kurihashi1

  • 1Kurihashi Eye Clinic, Hamamatsu, Japan.

Ophthalmologica. Journal International D'Ophtalmologie. International Journal of Ophthalmology. Zeitschrift Fur Augenheilkunde
|January 1, 1987
PubMed
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A new cotton thread system enclosed in silicone tubing accurately measures high tear volume in epiphora cases. This improved method enhances diagnosis for severe lacrimal conditions.

Area of Science:

  • Ophthalmology
  • Biomedical Engineering

Background:

  • Accurate tear volume measurement is crucial for diagnosing lacrimal deficiencies and epiphora.
  • Previous cotton thread methods had limitations in measuring high tear volumes due to low absorption capacity.

Purpose of the Study:

  • To develop and evaluate a novel system for enhanced tear volume measurement in cases of strong epiphora.
  • To overcome the limitations of existing methods for quantifying excessive lacrimation.

Main Methods:

  • A new system was developed using a standard cotton thread encased in soft, calibrated silicone tubing.
  • The wetted length of the thread was measured over 5 to 10 seconds in patients with strong epiphora.
  • Performance was compared to the use of thread alone.

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Main Results:

  • The new system measured a wetted length of 226.9 +/- 56.0 mm in strong epiphora cases.
  • The thread-alone method measured significantly less, 41.0 +/- 8.9 mm (p < 0.001).
  • The silicone-enclosed thread demonstrated superior capacity for measuring high tear volumes.

Conclusions:

  • The novel silicone-tubing-enclosed cotton thread system significantly improves the accuracy of tear volume measurement, especially in strong epiphora.
  • This enhanced diagnostic tool offers a more reliable method for assessing severe lacrimal conditions.
  • The improved method addresses the shortcomings of previous techniques for high lacrimation volume quantification.