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Related Experiment Videos

Face-form frames.

G A Fry

    Journal of the American Optometric Association
    |January 1, 1978
    PubMed
    Summary
    This summary is machine-generated.

    Face-form frames pose significant challenges for prescription lenses, particularly strong prescriptions. Lens angling alters optical properties and complicates fitting, leading to inaccuracies and distortion that outweigh any benefits.

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    Area of Science:

    • Ophthalmic optics
    • Eyewear design

    Background:

    • Face-form frames are common for sunglasses but problematic for prescription eyewear.
    • Strong lens powers exacerbate issues with face-form frames.

    Purpose of the Study:

    • To investigate the optical and fitting challenges of using face-form frames for prescription lenses.
    • To evaluate the impact of lens angling in face-form frames on optical performance.

    Main Methods:

    • Analysis of optical aberrations induced by lens angling in face-form frames.
    • Assessment of difficulties in achieving accurate interpupillary distance (P.D.) with these frames.
    • Evaluation of lens mounting complexities.

    Main Results:

    • Lens angling significantly alters effective lens power and cylinder axis location.

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  • Achieving correct interpupillary distance (P.D.) is difficult.
  • Unwanted spherical and cylindrical power, along with distortion, are generated in the lens periphery.
  • These optical effects are predictable and measurable.

    • Conclusions:

    • Face-form frames are generally unsuitable for prescription lenses, especially high-power ones.
    • The optical compromises and fitting difficulties outweigh the minimal benefit of an increased field of view.
    • Careful consideration of optical performance is necessary when selecting eyewear frames.