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Oxygen and water

R M Hill, G Andrasko

    Journal of the American Optometric Association
    |March 1, 1981
    PubMed
    Summary

    Water loss from hydrophilic contact lenses significantly reduces oxygen transmission to the cornea. This impacts corneal health during typical wear conditions.

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    Area of Science:

    • Ophthalmology
    • Biomaterials Science
    • Corneal Physiology

    Background:

    • Hydrophilic contact lenses are widely used for vision correction.
    • Oxygen transmissibility is crucial for maintaining corneal health.
    • Dehydration of contact lenses can alter their physical properties.

    Purpose of the Study:

    • To quantify the impact of water loss on the oxygen transmissibility of four hydrophilic contact lens types.
    • To discuss the clinical relevance of these changes under ambient conditions.

    Main Methods:

    • Four types of hydrophilic contact lenses were subjected to controlled dehydration.
    • Oxygen transmission efficiency (Dk/t) was measured before and after water loss.
    • Measurements were taken under simulated ambient wearing conditions.

    Main Results:

    • Significant reduction in oxygen transmission efficiency was observed with water loss across all lens types.
    • The degree of reduction varied depending on the specific lens material.
    • Clinical implications suggest potential for corneal hypoxia with lens dehydration.

    Conclusions:

    • Water content significantly influences the oxygen supply to the cornea from hydrophilic lenses.
    • Clinicians should consider lens dehydration as a factor affecting corneal oxygenation.
    • Further research into lens materials with improved hydration stability is warranted.

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