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Thread: Trifocal with more intermediate power

  1. #1
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    Trifocal with more intermediate power

    I'm looking for a trifocal lens with more than 50% of the bifocal add in the middle zone preferably in a plastic. Does anything exist? I found Acclaim 61's in glass which have a 61% of add if I have to go that route.
    Thanks,

    Chris

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    My Brain Hurts jpways's Avatar
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    I just went through jobson's lens book availabile here: http://bt.e-ditionsbyfry.com/publication/?i=455093 (it does not look like a login is required as I opened the link in another browser that was not logged into frames data) in not glass I'm not seeing anything stock. That being said most of the trifocals do not list their trifocal add %.
    Three Rivers Optical does have their custom Trifocal (listed under 1.50, 1.67, and polycarbonate) which is their O Seg on the front surface of the lens and a second O seg on the back surface of their lens to make up the trifocal. As both segments are custom (within the normal O seg sizes for the front surface) it says they can make the trifocal be any size you want, however it says nothing about trifocal power. However, when they first released this I remember that they only listed as a computer style lens with a relatively low add range compared to their standard O seg bifocal (I do not have the paper anymore so I can't be more specific) and I don't know if anything has changed, though Jobson does list the add range as +2.00 to +8.00 (I would assume on the bifocal portion).

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    Master OptiBoarder rbaker's Avatar
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    The cost of fabricating a mold to produce a single semi-finished polymer lens would probably cost in excess of $10.000.00. So forget about that, eh. And, 3D printing technology ain't there yet.

    The good news is that you can revert to 275 year old technology and make up a Franklin 3 Piece Trifocal. The beauty of this lens is that you can have precise control over power, prism and OC location in all three zones.

    The bad news is trying to find a real optician to fabricate it. Lotsa luck!

  4. #4
    One eye sees, the other feels OptiBoard Silver Supporter
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    Quote Originally Posted by CHRIS F View Post
    I'm looking for a trifocal lens with more than 50% of the bifocal add in the middle zone preferably in a plastic. Does anything exist? I found Acclaim 61's in glass which have a 61% of add if I have to go that route.
    Thanks,

    Chris
    Welcome to OB Chris. Acclaim 61 is all I can think of. It is available in CR39 plastic.

    http://www.x-celoptical.com/acclaim61.php

    Hope this helps,

    Robert Martellaro
    Science is a way of trying not to fool yourself. - Richard P. Feynman

    Experience is the hardest teacher. She gives the test before the lesson.



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    Thanks for the help. I ended up going with the Acclaim, didn't realize it came in plastic.
    Hope everyone has a great Memorial Day weekend!

    Chris Finkbeiner

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    Master OptiBoarder OptiBoard Silver Supporter
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    I was told X-Cel was purchased by Essilor and was cutting out some of those specialty lenses. If that's true, get that stuff while you can.

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    Master OptiBoarder OptiBoard Gold Supporter
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    Quote Originally Posted by jefe View Post
    I was told X-Cel was purchased by Essilor and was cutting out some of those specialty lenses. If that's true, get that stuff while you can.
    I heard that also about 2 years ago but I haven't noticed anything different from them. I don't know why Essilor would, other than specialty stuff what makes X-Cel special? Isn't that kind of their forte?

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    Quote Originally Posted by Tallboy View Post
    I heard that also about 2 years ago but I haven't noticed anything different from them. I don't know why Essilor would, other than specialty stuff what makes X-Cel special? Isn't that kind of their forte?
    Yeah -- it woulsn't make sense for them to get rid of the specialty stuff. But there are a lot of things in life which don't make sense.

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    If there is a barcode available for any of the specials, the lens was kept. Other than that you're out of luck

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    Ghost in the OptiMachine Quince's Avatar
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    No changes in my stock. I rarely use X-Cel, so maybe I haven't noticed the loss of particular items. I'll ask for a new availability list and poke around for changes- it's long overdue anyways.
    Have I told you today how much I hate poly?

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