Please recommend a lens (and coating) plus a few questions.

Discussion in 'Optometry Archives' started by John E., Nov 12, 2003.

  1. John E.

    John E. Guest

    This newsgroup is a great resource.

    I'm about to purchase at least one new pair of glasses. I'd like a
    recommendation for lens material (or a specific lens brand name). My
    general vision prescription is as follows:

    R: +2.75 -2.00 97 3 B. O.
    L: +1.75 -1.00 88 3 B. O.

    Note that I have 3 BO prism in each lens as this helps correct an
    esotropia.

    I'll probably go with with a rimless or half rim frame design. I'm
    hoping for an end product that is relatively light as I am easily
    annoyed by glasses that slip down my nose. I am also pretty picky
    about optical quality. What lens should I ask the optician about?

    I am planning to purchase a lens that darkens in the sunlight; the
    optical shop mentioned Transitions. Does this work well with all lens
    materials? My current lens have an AR coating, would I want both the
    AR coating and the Transitions process? The Transitions literature
    mentions that scratch coating is included.

    Regarding Transitions, do most people find that the lenses are clear
    enough for night time and indoor use? Or, do they remain too dark?

    In addition to my general vision lenses, my doctor has recommended a
    pair of computer glasses. I would ask for a lens recommendation, but
    in this case my doctor has specified the lens as the Prio Browser
    (150). Any comments? The only alternative she proposed was a Prio
    Computer with a very similar range. As compared to the "Computer",
    the "Browser" lens had a slightly greater range
    from top to bottom; since a portion of the lens includes my distance
    prescription, this one is favored by my doctor.

    Regarding the frame choice, are there any issues I should be aware of
    when choosing a rimless frame? I also notice that the majority of the
    metal frames in the shop are now titanium.

    I'm quite impressed by some of the nicer frames in the shop under the
    brand names of Freudenhaus, Lunor and Robert Marc. But, as I am
    buying two or three pairs, I may have to be content with a CK/Marchon.
    Are the fancy brands superior in construction, or is it just a
    question of style?

    Lastly, as compared to a few years ago, I notice that most of the
    frames do not include a spring loaded temple. I have come to like
    these and asked the optician. His response was that if the frame is
    properly fit, a spring loaded temple does not provide any additional
    benefit. Comments?

    Thanks in advance,

    John
     
    John E., Nov 12, 2003
    #1
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  2. John E.

    Mark A Guest

    Just saying "Transitions" is not enough since they come in many different
    materials. Transitions is not really a lens material, but something that is
    embedded in other materials from many different manufacturers. Scratch
    coating probably differs by lens, but is usually included in these type of
    high-end products.

    I don't know how well Transitions work, but some people have reported on
    this forum that they are disappointed in them as a replacement for
    sunglasses, or that they don't darken fast enough.

    A lot of opticians push polycarbonate material for rimless frames because of
    its tensile strength (good for drilling holes on rimless designs). But
    optical quality is poor (relatively speaking). You might try Hoya Phoenix
    Transitions which is a Trivex material that is about equally as strong as
    polycarb, but much better optics. The Phoenix material (1.53 index) is a
    little bit thicker than polycarb (1.59 index), But this is not a problem
    with your plus Rx since plus lenses are thin at the edges, and also because
    Phoenix is lighter per same volume (1.11 g/cm3 for Phoenix vs. 1.20 g/cm3
    for polycarb), so the total weight is probably close to the same.

    Traditional spring loaded designs add weight to the frame. The sophisticated
    ones that weigh a little less are around, but cost more and are usually
    found in high end products.

    Another good material is Sola Spectralite Velocity Transitions (1.53 index).
    Not as strong as Hoya Phoenix, but very good optics and relatively light
    weight (1.21 g/cm3).

    Some opticians may not normally sell Hoya or Sola and may be somewhat
    reluctant to use them (or their "regular" lab may not have them). So it may
    take some persistence and possibly trying another optician.

    If you decide not to go with Transitions, the regular Hoya Phoenix is still
    a good option for drilled frames.
     
    Mark A, Nov 12, 2003
    #2
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  3. John E.

    John E. Guest

    Thank you for the favor of your reply. See my followup comments
    below:
    Yes, I do understand that it is a process applied to a lens material.
    However, I am not
    familiar with the specifics. I was wondering if it worked better with
    particular
    materials, perhaps. Also, I wanted to know if it is complimentary to
    an AR coating.
    I see, thank you. I plan to keep an additional plan for real
    sunglasses (and for
    driving), but to use these for dailyware.
    Sounds like a good recommendation. I want to avoid polycarb; I am not
    happy with
    the optical quality.

    But, please not that since I have a prism (+3), the lenses are not
    thin at the outside
    edge. However, I don't know that any material would help that, since
    a prism is
    required.
    I'll looke for those, thanks.
    I'll ask about both. It's a fairly high-end shop, so I hope that the
    optician is aware of
    one or the other.

    -John
     
    John E., Nov 12, 2003
    #3
  4. John E.

    Mark A Guest

    I am not an optician and don't know a lot about Transitions. You might want
    to look at http://www.transitions.com to get more information. It is good to
    know about the subject before talking to an optician.
    As long as your expectations are not too high it may be OK. Would be nice if
    opticians had a plano Transitions lens that they could demo (maybe some do).
    Sorry about that. I am not an optician (just an educated consumer), so I
    don't know much about prisms.
    There are so many products out there that not many opticians bother to learn
    about all of them, especially if the customers never ask questions and the
    opticians get to pick the lens supplier. The good thing about independent
    opticians is that they can deal with multiple labs, one of which is sure to
    carry the product you want. However, many opticians like to stay with a
    small number of lens suppliers and one (or a small number) of labs, and it
    make take some prodding or going to other shops to get what you want.
     
    Mark A, Nov 12, 2003
    #4
  5. John E.

    Mark A Guest

    Looks like you can Transitions from the other Trivex lens manufacturer also.
    That would be Younger Trilogy Aspheric SV (in additon to Hoya Phoenix). As I
    said previously, I don't know much about prism lenses, so don't know if they
    are made from SV lens stock.
     
    Mark A, Nov 12, 2003
    #5
  6. John E.

    Mark A Guest

    Looking at the Transitions website, it appears that polycarbonate and Trivex
    don't work quite as well as other materials in going completely clear
    indoors and dark outdoors. Here is what they say:

    "Virtually as clear as regular Trivex lenses indoors [which means "not as
    clear"] and darken to 80% tint outdoors [that means 80% of the tint that
    most other lenses go to]."

    Similar language for polycarbonate material.
     
    Mark A, Nov 14, 2003
    #6
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