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Related Experiment Videos

A simple interferometer for hard contact lenses

L F Garner

    American Journal of Optometry and Physiological Optics
    |November 1, 1981
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces an interference technique for assessing the back surface of hard contact lenses. The method effectively measures peripheral zones in aspheric lens designs using standard laboratory equipment.

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    Area of Science:

    • Ophthalmic Optics
    • Biomedical Engineering
    • Materials Science

    Background:

    • Accurate assessment of contact lens surfaces is crucial for visual performance and ocular health.
    • Existing methods for evaluating posterior lens surfaces, especially peripheral zones, can be limited.
    • Hard contact lens designs, including aspheric types, require precise manufacturing and quality control.

    Purpose of the Study:

    • To describe a novel interference technique for evaluating the back surface of hard contact lenses.
    • To demonstrate the application of this method for measuring the peripheral zones of specific lens designs.
    • To provide examples of qualitative surface assessment using the developed technique.

    Main Methods:

    • Utilized an interference technique for non-contact surface assessment.

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  • Employed a low-power stereo-microscope, a common instrument in contact lens practice.
  • Applied the method to measure the peripheral zones of two distinct aspheric hard contact lens designs.

    • Main Results:

    • Successfully demonstrated the application of the interference technique for back surface assessment.
    • Obtained measurement data for the peripheral zones of two aspheric lens designs.
    • Provided qualitative examples illustrating the utility of the technique for surface evaluation.

    Conclusions:

    • The described interference technique offers a viable method for assessing the back surface of hard contact lenses.
    • The technique is applicable to measuring critical peripheral zones, particularly in aspheric lens designs.
    • The use of standard laboratory equipment makes this method accessible for routine contact lens practice.