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Tear flow under hydrogel contact lenses.

K A Polse

    Investigative Ophthalmology & Visual Science
    |April 1, 1979
    PubMed
    Summary

    Tear replenishment rates are significantly lower with hydrogel lenses compared to rigid lenses. This indicates that oxygen delivery to the cornea primarily occurs through diffusion with hydrogel contact lenses.

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    Area of Science:

    • Ophthalmology
    • Biomaterials Science
    • Corneal Physiology

    Background:

    • Hydrogel contact lenses are widely used for vision correction.
    • Understanding tear dynamics and oxygen transport under contact lenses is crucial for corneal health.
    • Previous studies indicated different tear replenishment rates for various contact lens materials.

    Purpose of the Study:

    • To quantify the fractional tear volume replenishment rate under three different hydrogel lenses.
    • To compare tear replenishment rates between hydrogel and rigid contact lenses.
    • To assess the primary mechanism of oxygen delivery to the cornea under hydrogel lenses.

    Main Methods:

    • Utilized a slit lamp modified as a fluorophotometer to measure tear replenishment.
    • Assessed tear volume changes per blink under hydrogel contact lenses.
    • Compared measured rates to established rates for rigid gas permeable lenses.

    Main Results:

    • Fractional tear volume replenishment rates under hydrogel lenses averaged 0.011 per blink.
    • This rate is substantially lower than the 0.10 to 0.20 per blink reported for rigid lenses.
    • Indicates minimal tear pumping-induced oxygen delivery with hydrogel lenses.

    Conclusions:

    • Tear pumping contributes minimally to oxygen supply under hydrogel contact lenses.
    • Oxygen primarily reaches the cornea through diffusion through the hydrogel lens material.
    • Corneal oxygenation relies heavily on the diffusive properties of hydrogel lens materials.

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