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Related Experiment Videos

Topographical corneal oedema.

B A Holden, J J McNally, G W Mertz

    Acta Ophthalmologica
    |December 1, 1985
    PubMed
    Summary
    This summary is machine-generated.

    Peripheral corneal swelling is minimal during continuous hydrogel contact lens wear, even with high minus powers. This reduced swelling in the cornea periphery is due to physical limitations, not tear exchange.

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    Area of Science:

    • Ophthalmology
    • Biomedical Engineering
    • Corneal Physiology

    Background:

    • Continuous wear of hydrogel contact lenses can induce corneal edema.
    • Understanding topographical changes in corneal thickness is crucial for contact lens fitting and patient safety.

    Purpose of the Study:

    • To investigate topographical corneal thickness changes during continuous wear of hydrogel contact lenses.
    • To determine the influence of lens power and anoxic conditions on peripheral versus central corneal swelling.

    Main Methods:

    • 10 subjects wore 3 types of hydrogel contact lenses with varying back vertex powers for 7 days.
    • Corneal thickness was monitored across the cornea using topographical analysis.
    • An anoxic stimulus was applied to assess tear exchange's role.

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    Main Results:

    • Peripheral corneal swelling was significantly less than central corneal swelling.
    • Higher levels of central corneal edema and higher minus lens powers exacerbated this difference.
    • Anoxic stimulus caused greater central than peripheral swelling, indicating limited peripheral tear exchange impact.

    Conclusions:

    • The topographical swelling profile is intrinsic to the cornea, not solely contact lens-induced.
    • The peripheral cornea exhibits a reduced swelling capacity due to physical restraint at the limbus.
    • This finding has implications for contact lens design and wear recommendations.