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Related Experiment Videos

Soft lens base curve measurements

C P Johansen, J C Huyler, J E Peterson

    Journal of the American Optometric Association
    |March 1, 1980
    PubMed
    Summary

    This study introduces an affordable system for measuring soft lens base curves. Spin cast lenses are more accurate and maintain their base curve after cleaning, unlike lathe cut lenses.

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    Area of Science:

    • Ophthalmology
    • Materials Science

    Background:

    • Accurate measurement of soft contact lens base curves is crucial for proper fit and visual acuity.
    • Existing methods for base curve verification can be inefficient or costly.

    Purpose of the Study:

    • To present an efficient and inexpensive base curve measurement system for soft contact lenses.
    • To compare the accuracy of lathe cut versus spin cast soft lenses.
    • To investigate the impact of cleaning, asepticizing, dehydration, and rehydration on soft lens base curves.

    Main Methods:

    • Development and utilization of a novel, cost-effective base curve measurement system.
    • Comparative analysis of base curve accuracy between lathe cut and spin cast lens manufacturing methods.
    • Experimental studies to assess base curve stability under various post-manufacturing conditions.

    Main Results:

    • Spin cast lenses exhibit greater accuracy in base curve measurement compared to lathe cut lenses.
    • Lathe cut lenses show significant deviations from specified base curves.
    • Spin cast lenses maintain base curve integrity after cleaning and asepticizing procedures.
    • Repeated dehydration and rehydration cycles alter the base curve configuration of spin cast lenses.

    Conclusions:

    • The developed measurement system offers an efficient and economical solution for soft lens base curve verification.
    • Spin cast lenses are superior to lathe cut lenses regarding base curve accuracy and stability.
    • Understanding base curve changes due to environmental factors is essential for maintaining lens performance.

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