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Corneal thickness changes from bathing solutions.

R S Chan, R B Mandell

    American Journal of Optometry and Physiological Optics
    |July 1, 1975
    PubMed
    Summary
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    Hypotonic sodium chloride solutions cause corneal swelling. The degree of swelling in the cornea, a part of the eye, is directly related to how hypotonic the solution is.

    Area of Science:

    • Ophthalmology
    • Corneal Physiology
    • Ocular Surface Research

    Background:

    • The cornea's hydration balance is crucial for maintaining its transparency and optical properties.
    • Understanding how the corneal stroma responds to osmotic stress is essential for ocular health and disease management.

    Purpose of the Study:

    • To investigate the relationship between the concentration of sodium chloride solutions and the resulting changes in corneal thickness.
    • To quantify the extent of corneal swelling induced by hypotonic solutions.

    Main Methods:

    • Corneal thickness was measured after exposing the outer corneal surface to various concentrations of sodium chloride solutions.
    • Exposure was achieved through either total immersion using goggles or topical application of drops for a 20-minute duration.

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    Main Results:

    • A nearly linear correlation was observed between the degree of hypotonicity of the sodium chloride solution and the resultant corneal swelling.
    • The data indicate that lower salt concentrations lead to a more pronounced increase in corneal thickness.

    Conclusions:

    • Hypotonic sodium chloride solutions induce measurable corneal swelling.
    • The extent of corneal edema is predictable based on the degree of solution hypotonicity, suggesting a dose-dependent osmotic effect on corneal hydration.