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Related Experiment Videos

The osmotic variable

J E Terry, R M Hill

    Journal of the American Optometric Association
    |March 1, 1977
    PubMed
    Summary
    This summary is machine-generated.

    Individual tear osmolarity differences provide a safety margin against corneal edema when wearing hard contact lenses. These small variations are crucial for preventing hypotonic shifts and maintaining ocular health.

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    Area of Science:

    • Ophthalmology
    • Corneal Physiology

    Background:

    • Contact lens wear can alter the corneal microenvironment.
    • Tear osmolarity is a key factor in corneal hydration and health.

    Purpose of the Study:

    • To investigate the significance of pre-fitted tear osmotic baselines in patients.
    • To determine the relationship between tear osmolarity and hard contact lens tolerance.

    Main Methods:

    • Analysis of patient tear osmotic baselines prior to contact lens fitting.
    • Assessment of potential osmotic shifts induced by polymethyl methacrylate (PMMA) contact lenses.

    Main Results:

    • Patients exhibit distinct prefitted tear osmotic baselines.
    • These baseline differences, though small, act as a protective buffer against hypotonic shifts.

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  • The safety margin provided by tear osmolarity is critical for preventing osmotic edema during PMMA lens wear.

    • Conclusions:

    • Pre-fitted tear osmolarity is an important individual patient parameter.
    • Understanding tear osmolarity baselines enhances the safety and efficacy of hard contact lens prescriptions.
    • This highlights the need for personalized assessment of ocular surface hydration.