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Related Experiment Videos

Variable focus spectacles.

B M Wright

    Transactions of the Ophthalmological Societies of the United Kingdom
    |April 1, 1978
    PubMed
    Summary
    This summary is machine-generated.

    Variable focus spectacles offer a new solution for presbyopia, aphakia, and glaucoma. These fluid-filled prostheses adjust focus using a flexible lens, nearing commercial readiness.

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    Area of Science:

    • Ophthalmology
    • Biomedical Engineering
    • Optometry

    Background:

    • Presbyopia, a common age-related condition, affects near vision and necessitates corrective lenses.
    • Current solutions for presbyopia include reading glasses, bifocals, and multifocal contact lenses.
    • The development of adjustable prostheses aims to provide a more dynamic visual correction.

    Purpose of the Study:

    • To review the historical development of prostheses for presbyopia.
    • To describe the design and function of novel variable focus spectacles.
    • To evaluate the potential applications of these spectacles for various visual impairments.

    Main Methods:

    • Historical review of ophthalmic prostheses for presbyopia.
    • Detailed description of the fluid-cell technology in variable focus spectacles.

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  • Analysis of the mechanical operation of the bellows system for curvature adjustment.

    • Main Results:

    • The study traces the evolution of presbyopia correction devices.
    • Variable focus spectacles feature fluid-filled cells with a flexible posterior wall.
    • Focus adjustment is achieved by manipulating a bellows mechanism integrated into the spectacle arm.

    Conclusions:

    • The described variable focus spectacles represent a significant advancement in visual prosthetics.
    • Potential applications extend beyond presbyopia to include aphakia and glaucoma management.
    • The technology is deemed mature enough for progression towards commercial production and market release.