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Bifocal contact lenses

I M Borish, S Soni

    Journal of the American Optometric Association
    |March 1, 1982
    PubMed
    Summary
    This summary is machine-generated.

    This study details fitting techniques for hard bifocal contact lenses, offering a clinical method to determine segment height and position for successful vision correction. These principles may also apply to soft bifocal contact lenses.

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    Area of Science:

    • Ophthalmology
    • Optometry
    • Biomedical Engineering

    Background:

    • Contact lens technology has advanced to include multifocal designs for presbyopia correction.
    • Bifocal contact lenses offer a solution for patients needing correction for both distance and near vision.
    • Understanding the fitting characteristics of different bifocal contact lens designs is crucial for successful patient outcomes.

    Purpose of the Study:

    • To describe the construction and optical behavior of three general forms of hard contact lens bifocals.
    • To outline essential fitting criteria, techniques, and qualifications for successful bifocal contact lens fitting.
    • To present a detailed technique for fitting segmented bifocal contact lenses and a clinical method for determining segment parameters.

    Main Methods:

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  • Description of the construction and optical properties of three hard bifocal contact lens designs.
  • Evaluation of fitting criteria and techniques specific to each design.
  • Detailed explanation of a long-standing technique for fitting segmented bifocal contact lenses.
  • Introduction of a clinical technique for pre-ordering assessment of segment height, position, and translation viability.

    • Main Results:

    • Common fitting principles apply across different hard bifocal contact lens constructions.
    • Edge design and lid action significantly influence lens positioning and rotation.
    • A practical clinical technique allows for accurate determination of segment parameters before lens ordering.
    • The described principles are potentially applicable to soft bifocal contact lens designs.

    Conclusions:

    • Successful fitting of hard bifocal contact lenses relies on understanding their construction and optical behavior.
    • A systematic approach to fitting, considering lens design and patient-specific factors, is essential.
    • The presented clinical technique simplifies the process of selecting appropriate segment parameters.
    • The findings suggest a unified approach to fitting both hard and soft bifocal contact lenses.