How do multifocal IOLs work?

Discussion in 'Laser Eye Surgery' started by omc, Feb 11, 2018.

  1. omc

    omc

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    I recently had cataract surgery, and got a Tecnis Multifocal 2.75 lens in one eye.

    I don't understand how multifocal lenses work. If I understand properly, they allow vision to be clear at every distance. But how is it possible for the vision to be clear at every distance?
     
    omc, Feb 11, 2018
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    VisionEyeInstitute likes this.
  2. omc

    VisionEyeInstitute

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    Artificial intraocular lenses (IOLs) are made of soft, flexible plastic and are used to replace your body’s natural lens. They can also be used to correct pre-existing refractive errors, such as short-sightedness, long-sightedness and/or astigmatism (blurry vision due to an abnormally shaped cornea or lens).

    There are a number of replacement lens options available – the lens you choose will influence whether you still require glasses for certain activities following surgery. Multifocal lenses allow clear focus at more than one distance but have a higher risk of visual side-effects (e.g. glare and halos around lights).

    • Bifocal lenses allow clear focus at two distances (near/reading and far), but glasses are likely to be required for intermediate distances (e.g. computer work).

    • Trifocal lenses allow clear vision at three distances (near/reading, intermediate and far). Glasses are often not required for standard day-to-day activities following surgery.
     
    VisionEyeInstitute, Sep 22, 2023
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