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One-way flow in the lacrimal drainage system: determinants from the basic sciences

H A Sisler

    Annals of Ophthalmology
    |January 1, 1982
    PubMed
    Summary
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    The lacrimal pump

    Area of Science:

    • Ophthalmology and Physiology

    Background:

    • The lacrimal pump and valvular system's physiology is understood.
    • The physical and histologic anatomy require further clarification.

    Purpose of the Study:

    • To clarify the physical and histologic aspects of the lacrimal pump's anatomy.
    • To explain the anatomical basis for unidirectional tear flow.

    Main Methods:

    • Review of anatomical and physical principles governing fluid dynamics.
    • Analysis of microciliation and valvular structures.

    Main Results:

    • Forward-directed capillarity, Bernoulli's law, and Venturi effect contribute to unidirectional flow.
    • Histologic microciliation prevents backflow of nasal secretions.

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    Conclusions:

    • The lacrimal system's anatomy is optimized for forward tear flow.
    • Physical laws and microciliation prevent nasal secretions from entering the conjunctival sac.