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Related Experiment Videos

Lacrimal equilibration time (LET): a quick and simple dry eye test

J E Lavaux, W D Keller

    Optometry and Vision Science : Official Publication of the American Academy of Optometry
    |October 1, 1993
    PubMed
    Summary

    A new test for the lacrimal system aids in diagnosing dry eye disease. Preliminary results show a correlation between dry eye symptoms and visual acuity recovery time after using artificial tears.

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    Area of Science:

    • Ophthalmology
    • Optometry
    • Lacrimal System Physiology

    Background:

    • Dry eye disease is a prevalent condition affecting the ocular surface.
    • Accurate diagnosis is crucial for effective management.
    • Current diagnostic methods, including the Schirmer test and questionnaires, have limitations.

    Purpose of the Study:

    • To introduce and evaluate a novel, simple test for assessing the lacrimal system in dry eye patients.
    • To compare the efficacy of this new test with the established Schirmer test and patient symptom questionnaires.
    • To determine the potential of this test as an additional diagnostic tool for dry eye.

    Main Methods:

    • A new test involving instilling artificial tears (Celluvisc) and measuring visual acuity recovery time was developed.

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  • The test was administered to patients, and results were compared with the Schirmer test and a standard dry eye questionnaire.
  • Patient's monocular distance visual acuity was measured before and after artificial tear instillation.

    • Main Results:

    • Preliminary findings indicate a correlation between dry eye symptoms and the time taken for visual acuity to return to normal after artificial tear use.
    • The new test demonstrated potential as a supplementary diagnostic method for dry eye.
    • The test is simple, uses readily available materials, and can be administered by trained assistants.

    Conclusions:

    • The novel visual acuity recovery time test shows promise in diagnosing dry eye.
    • This test offers a potentially valuable addition to existing diagnostic tools for dry eye.
    • Further research with larger populations and precise dispensers is recommended to validate these findings.