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Related Experiment Videos

A dual optic accommodating foldable intraocular lens.

S D McLeod1, V Portney, A Ting

  • 1Department of Ophthalmology, University of California San Francisco, San Francisco, CA 94143, USA. smcleod@itsa.ucsf.edu

The British Journal of Ophthalmology
|August 21, 2003
PubMed
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This study designed a dual optic intraocular lens (IOL) that enhances accommodative range. The novel accommodating IOL design shows promise for improving vision after cataract surgery.

Area of Science:

  • Ophthalmology
  • Biomedical Engineering
  • Optics

Background:

  • Presbyopia, the age-related loss of accommodation, significantly impacts visual quality.
  • Current intraocular lens (IOL) technology often fails to fully restore accommodative function.
  • There is a need for advanced IOLs that mimic the natural eye's ability to focus at different distances.

Purpose of the Study:

  • To design a novel accommodating intraocular lens (IOL) with an extended range of accommodation.
  • To ensure the designed IOL is compatible with standard phacoemulsification and endocapsular implantation techniques.
  • To evaluate the optical principles of a dual-optic accommodating IOL design.

Main Methods:

  • Utilized ray tracing analysis for lens design and optical performance simulation.

Related Experiment Videos

  • Developed a dual-optic, one-piece foldable silicone lens.
  • Performed cadaver eye implantation to assess feasibility.

    • Main Results:

    • Ray tracing confirmed that a dual-optic system (converging anterior, diverging posterior) with spring-loaded haptics yields greater change in refractive power than single-optic designs.
    • Axial movement of the anterior optic was key to achieving enhanced accommodative effect.
    • A prototype dual-optic IOL was successfully implanted in two cadaver eyes via a 4 mm corneal incision.

    Conclusions:

    • The dual-optic intraocular lens design effectively increases the optical effect of lens displacement.
    • This design represents a promising advancement for accommodating intraocular lenses.
    • The findings suggest a viable approach to restoring functional accommodation in pseudophakic eyes.