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Factors affecting peripheral curve design.

M M Bibby

    American Journal of Optometry and Physiological Optics
    |January 1, 1979
    PubMed
    Summary
    This summary is machine-generated.

    Contact lens edge clearance depends on peripheral curve radius, width, and diameter. Adjusting these parameters, particularly width for major changes and radius for minor ones, optimizes lens fit.

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    Area of Science:

    • Ophthalmology
    • Biomedical Engineering
    • Optometry

    Background:

    • Accurate contact lens fitting is crucial for ocular health and visual acuity.
    • Edge clearance influences tear exchange and lens-corneal interactions.

    Purpose of the Study:

    • To quantify the impact of key design parameters on contact lens edge clearance.
    • To evaluate current contact lens design practices based on quantified effects.

    Main Methods:

    • Analysis of the relationship between peripheral curve radius, width, lens diameter, and corneal shape.
    • Quantification of the effect of each parameter on edge clearance.

    Main Results:

    • Peripheral curve radius and width, lens diameter, and corneal shape are key factors in edge clearance.

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  • Minor adjustments to edge clearance can be achieved by altering the peripheral curve radius.
  • Major adjustments require changes in the peripheral curve width.

    • Conclusions:

    • Peripheral curve radius should be steepened with increasing lens diameter for optimal fit.
    • Design modifications should consider the differential impact of radius versus width adjustments.