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Related Experiment Videos

Flatter than "K," on "K," steeper than "K": does the cornea know the difference?

J T Barr, J P Schoessler

    American Journal of Optometry and Physiological Optics
    |January 1, 1981
    PubMed
    Summary

    This study investigated polymethyl methacrylate (PMMA) contact lenses and their effect on corneal thickness. Lenses fitted 1 D flatter than the steepest corneal curvature ("K") resulted in the least corneal thickness change.

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    Area of Science:

    • Ophthalmology
    • Corneal Physiology
    • Contact Lens Optics

    Background:

    • Polymethyl methacrylate (PMMA) contact lenses are used in vision correction.
    • Understanding corneal response to contact lens fitting is crucial for patient comfort and safety.
    • Corneal thickness changes can indicate physiological stress or adaptation.

    Purpose of the Study:

    • To evaluate the impact of different contact lens fitting parameters on corneal thickness.
    • To identify optimal fitting conditions for PMMA contact lenses to minimize corneal changes.

    Main Methods:

    • A double-masked clinical trial involving 29 subjects.
    • Subjects were fitted with PMMA contact lenses of identical diameter and optical zone.
    • Five different treatment groups based on lens fit relative to "K" (keratometry) were analyzed.

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  • One-way analysis of variance (ANOVA) was used to compare corneal thickness changes.

    • Main Results:

    • Significant differences in corneal thickness change were observed between the treatment groups.
    • Contact lenses fitted 1 diopter (D) flatter than "K" demonstrated the minimal corneal thickness alteration.

    Conclusions:

    • The fitting depth of PMMA contact lenses significantly influences corneal thickness.
    • Fitting lenses 1 D flatter than "K" appears to be the optimal strategy for reducing corneal thickness changes associated with PMMA lens wear.