December 1993
Volume 34, Issue 13
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Articles  |   December 1993
The phenol red thread tear test: a cross-cultural study.
Author Affiliations
  • R Sakamoto
    Department of Ophthalmology, Tokyo Women's Medical College, Daini Hospital, Japan.
  • E S Bennett
    Department of Ophthalmology, Tokyo Women's Medical College, Daini Hospital, Japan.
  • V A Henry
    Department of Ophthalmology, Tokyo Women's Medical College, Daini Hospital, Japan.
  • S Paragina
    Department of Ophthalmology, Tokyo Women's Medical College, Daini Hospital, Japan.
  • T Narumi
    Department of Ophthalmology, Tokyo Women's Medical College, Daini Hospital, Japan.
  • Y Izumi
    Department of Ophthalmology, Tokyo Women's Medical College, Daini Hospital, Japan.
  • Y Kamei
    Department of Ophthalmology, Tokyo Women's Medical College, Daini Hospital, Japan.
  • E Nagatomi
    Department of Ophthalmology, Tokyo Women's Medical College, Daini Hospital, Japan.
  • Y Miyanaga
    Department of Ophthalmology, Tokyo Women's Medical College, Daini Hospital, Japan.
  • H Hamano
    Department of Ophthalmology, Tokyo Women's Medical College, Daini Hospital, Japan.
Investigative Ophthalmology & Visual Science December 1993, Vol.34, 3510-3514. doi:
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    • Get Citation

      R Sakamoto, E S Bennett, V A Henry, S Paragina, T Narumi, Y Izumi, Y Kamei, E Nagatomi, Y Miyanaga, H Hamano; The phenol red thread tear test: a cross-cultural study.. Invest. Ophthalmol. Vis. Sci. 1993;34(13):3510-3514.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

PURPOSE: To examine the results of the phenol red thread tear test in a cross-cultural comparison. METHODS: Two groups of 500 controlled normal subjects who do not wear contact lenses from the United States and Japan were investigated. RESULTS: The mean wet length of the thread for the United States was 23.9 mm (SD 9.5 mm). The mean for Japan was 18.8 mm (SD 8.6 mm). There was a significant difference between the two countries (P < 0.05). Males subjects had significantly longer wet lengths than females for both countries (P < 0.05). There was a moderate correlation between right and left eye results for both countries. CONCLUSIONS: The phenol red thread tear test was found to be easy to administer. Results were in line with current knowledge and theories of the lacrimal system. Results also indicated that this test may disclose subtle differences not previously found with other tear tests.

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