Tangent Streak Trifocal update

Discussion in 'Optometry Archives' started by Quick, Sep 12, 2005.

  1. Quick

    Quick Guest

    [I lost the other thread]

    Not sure how this happened but the consultant from
    Fused Kontacts somehow convinced my doc that the
    trifocals would not be a good idea and to try the aspheric
    ones. They centered perfectly and distance vision was
    really great. Unfortunately there was virtually no add.
    It was so bad that my doc doubled checked the lenses
    to be sure they sent the right ones. A little questioning
    and he said the consultant hadn't told him the size of
    the centers or the size to the full add. He said he didn't
    know if that was because the consultant just didn't
    know or if it varied by prescription or what... I urged
    him to switch consultants.

    He said he'd order the trifocals or maybe the bifocals
    for an initial fit followed by the trifocals.

    One potential problem? was that my lower lids didn't
    seem to effect any translation at all when looking down.
    When I blink I can see the lenses translate upward pulled
    by my upper eye lids (they go up and drop right back down).
    We did the camera thing and looking down the lens
    stays pretty much perfectly centered over the pupil
    and looks to be about 1/3 covered with my lower
    eyelid. I told him if big prisms with truncation didn't
    work maybe they could attach little handles to the
    bottoms.

    I'm really hoping because the distance clarity was
    remarkable.

    -Quick
     
    Quick, Sep 12, 2005
    #1
    1. Advertisements

  2. Quick

    Quick Guest

    Quick wrote:

    I should add that my pupils are right at 3.5 mm.
    For the lower eyelid thing he said these were pretty
    thick lenses and some translation could be expected.
    (~+1.00 with ~+2.00 add?).

    -Quick
     
    Quick, Sep 12, 2005
    #2
    1. Advertisements

  3. Well, I think if they are aspheric, they are not translating, and have
    no discrete near area that can be "double checked".

    A little questioning
    The aspherics are voodoo optics, and have no definable near zone.

    Seems reasonable.
    The aspherics don't translate at all, and aren't supposed to.

    Ibid.

    I told him if big prisms with truncation didn't
    The prisms will work. The lined bifocals *will* have prisms, unlike your
    aspherics.
    It should be good, but maybe not quite as good, as you may well get a
    bit of interference from the line(s) that you don't now have...

    w.stacy, o.d.
     
    William Stacy, Sep 12, 2005
    #3
  4. Tangent Streak by Fused is the only one I know of. I think they made a
    mistake introducing a non-translating aspheric under the same brand.
    Just confuses the issue. Tangent Streak describes pretty well the line
    that is actually just like an Executive spectacle bifocal, where the two
    different curvatures are tangential with one another at the center of
    the "streak" or line. The aspherics have no streaks or lines to be
    tangential at all.

    Anyway, no, unless Fused makes it, I don't think it exists. They might
    consider a wider intermediate seg and have probably experimentally tried
    it. I can't think of a reason it isn't technically feasable.

    w.stacy, o.d.
     
    William Stacy, Sep 12, 2005
    #4
  5. Quick

    Quick Guest

    I need to make friends with someone in manufacturing...

    -Quick
     
    Quick, Sep 12, 2005
    #5
  6. Quick

    LarryDoc Guest

    They addressed your confusion by calling the lenses Tangent Steak
    Bifocal, Tangent Steak Trifocal and Tangent Streak No-Line. (I use a
    lot of the latter, including using it myself.)

    The concept of a translating aspheric is out there as is translating
    segmented with aspheric progressive distance to midrange, and aspheric
    from distance through the near seg. Presbylite, a Gelflex version, and
    Llevations (cool name!) are examples. I've tried (although a few years
    back and there have been design changes since, so this is FWIW) the
    former two. The Gelflex was an awesome lens in terms of optics but the
    comfort, owing to the prism base and edge contour, blew it for me. I
    really like the idea of that lens (and combining aspheric and segmented
    optics!) and perhaps someone who has had more experience with it might
    comment on recent versions.

    --LB, O.D.
     
    LarryDoc, Sep 12, 2005
    #6
    1. Advertisements

Ask a Question

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.