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Thread: Prism only for the reading portion of a progressive

  1. #1
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    Prism only for the reading portion of a progressive

    2BI O.U

    I assume this means that patient's eyes dont properly converge.

    Anyone feel differently?

    This is my first time seeing any prism not related to entire Rx.

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    Kodak is labeling it as "Anti-fatigue Technology" and it is supposed to be good for people who are using near/intermediate for several hours a day. I understand it is a 1 base in prism on the add area only. Interested in what everyone thinks about this idea also....

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    Don't know anything about what Kodak is up to. But I have at least one referring doctor that sees a lot of adult strabismus and this is not un common. It's why we use Franklin bifocals. They can be made easily and relatively cheap and you don't have to wait so long for them to get to you from a specialty lab that the prescription has already changed when they get to you.

    Can't immagine why anyone would want to do this in a progessive though. These people have enough trouble getting things into focus already without inducing the inherent distortion of a progressive.

    Chip

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    Underemployed Genius Jacqui's Avatar
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    I agree with Chip. If you really need a progressive it can be done that way too. Kcount reported about doing a pair that way. One diopter is an anti-fatique lens, strabimus usually requires 2 or more diopters.

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    I have a doc that seems to do this to me about once a quarter, but since most of the pts we see have B.O. in the distance rx, we just use a fresnel prism on the reading portion to get our desired B.I. , typically my strabimus pts have lined bifocals, but I have done a couple that went with a progressive.

    But oh yeah everytime I see B.I. prism on the reading only its been for a convergence I agree ;)

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    X-Cel makes prism segs...

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    I have fitted impossible progressives for over 15 years, in powers and RX's where I was told it would never work, with a very high success rate.

    In all the Kodak idea has potential especially for patients with convergence issues for a variety reasons, but esp post cataract surgery near diplopia.

    For those of you who don't know, the Kodak Progressives have the option to add Base in prism in the reading only, they call it Anti-fatigue, but we have used to treat near only diplopia successfully with any issues.

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    Zeiss allows custom insets in their ff lenses. If the power is right you may be able to order it as an inset value. Post specifics and im sure someone here will calc and qualify it for you.
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    Underemployed Genius Jacqui's Avatar
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    Quote Originally Posted by MikeAurelius View Post
    X-Cel makes prism segs...
    They did at one time or have they started again?? Are these glass or plastic??

    Prism segs can be made in plastic by inlaying a segment that has been surfaced to include the prism. Another way is to surface a D-35 or 45 with the prism and use it as the read portion of a Franklin style bifocal, you can also do this with a progressive. Some will tell you to decenter a D-35 or 45, this sometimes works, sometimes doesn't. I personally wear an exec style made from two single vision lenses when I work.
    Last edited by Jacqui; 05-29-2012 at 08:16 PM. Reason: Added, Deleted, Multiplied

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    Underemployed Genius Jacqui's Avatar
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    Quote Originally Posted by sharpstick777 View Post
    I have fitted impossible progressives for over 15 years, in powers and RX's where I was told it would never work, with a very high success rate.

    In all the Kodak idea has potential especially for patients with convergence issues for a variety reasons, but esp post cataract surgery near diplopia.

    For those of you who don't know, the Kodak Progressives have the option to add Base in prism in the reading only, they call it Anti-fatigue, but we have used to treat near only diplopia successfully with any issues.
    How much prism is possible with the Kodak?? I have heard the max is 1 diopter.

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    Quote Originally Posted by Jacqui View Post
    They did at one time or have they started again?? Are these glass or plastic??

    Prism segs can be made in plastic by inlaying a segment that has been surfaced to include the prism. Another way is to surface a D-35 or 45 with the prism and use it as the read portion of a Franklin style bifocal, you can also do this with a progressive. Some will tell you to decenter a D-35 or 45, this sometimes works, sometimes doesn't. I personally wear an exec style made from two single vision lenses when I work.
    Glass.

  12. #12
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    I don't think that will create prism , just the corridor in the wrong place. Zeiss's variable inset is to be used when you measure a near pd....

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