Please help us again with your thoughts on what would provide us the best vision

Discussion in 'Eye-Care' started by Father Times, Nov 25, 2004.

  1. Father Times

    Father Times Guest

    Please help us again with your thoughts on what would provide us the best
    vision based on the information provided below.



    I took the information provided by this group and shopped three places with
    mixed results. I am trying to get the best glasses for my wife and myself.
    However, none of the four optical-sales-techs that I spoke to had all the
    facts especially the abbe value.



    My prescription is . . .

    O.D. +0.50 -0.75 X 090
    O.S. +0.50 -1.00 X 094
    Add +1.50 Since I have a weak prescription I wanted to get a mid-index lens
    with better optics. I could be mistaken, but I believe that my stigmatism
    needs to be corrected even for mid and distant vision to eliminate the
    blurring.



    My wife's prescription is . . .



    O.D. +1.50 SPH
    O.S. +1.25 SPH
    Add +2.25 we do not have a clue what would be best for my wife.



    Sam's Club:

    I have considered both trifocals and PAL. Sam's plastic trifocals are
    28mmX7mm or 35mmX8. They claim their reading portion was focused at 12" and
    its middle area was focused at 18". I do not know if these focal ranges
    make sense.

    They say that polycarbonate has better optics than plastic or CR39. Also,
    that plastic and CR39 are easier to scratch.

    Has Zeiss

    Told me that it was a hi-index polycarbonate.

    Said that polycarbonate had better optics than plastic or CR39

    Has Rodenstock

    Told me they only came in polycarbonate with a 1.58 mid index value.

    Has Solamax

    Told me they only came with a 1.537 mid index value but they did not know
    the material.



    Costco:

    Seems to be limited to their lens brand.

    Their license optician did not know the abbe value of their plastic lenses.

    Their license optician did not know the index value of their plastic lenses.

    Could not give a description of the prescription area of their PAL lenses.

    Has plastic trifocal lenses for $80.

    Has Natural lenses



    Walmart.

    More expensive than Sams for the better lenses.

    More optical support techs with varied experience (from zero to some
    fundamentals).



    Kind Regards and Thanks in Advance,



    Father Times
     
    Father Times, Nov 25, 2004
    #1
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  2. Father Times

    Dr Judy Guest

    Focal ranges in lined trifocals depend upon the power of the add, not the
    brand of the lens, ie the range is set by the prescription. The lens will
    not be focused at only one distance but will have a range of clear vision
    depending upon how much accommodation you have left and your pupil size.

    Your prescriber can tell you want range was intended by the add, but 12"
    sounds closer than what a +2.25 add would deliver.
    Instead of shopping a low service/low price opticals in discount stores, try
    an optical only store, an independent optician or an optometrist.

    Dr Judy
     
    Dr Judy, Nov 25, 2004
    #2
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  3. Father Times

    Mark A Guest

    Wrong, polycarbonate has the worst optics of any widely used material. CR39
    (also known as "hard resin" or "regular plastic") has about the best optics,
    but is thicker and heavier (1.50 index). Polycarbonate is also just about
    the easiest lens to scratch, even with a anti-scratch coating applied. CR-39
    are much harder than polycarbonate.
    All polycarbonate has about the same index (about 1.586). You don't need
    this high of an index for your Rx, and you don't need polycarb unless you
    need safety glasses. If you do need safety glasses try Hoya Phoenix (Trivex)
    lenses which have much better optics than polycarb. But I suspect that you
    are not involved in dangerous contact sports activities while wearing your
    glasses, nor do you work in a factory or laboratory where an explosion might
    occur, so you probably don't need to worry about safety glasses.
    Wrong, see above.
    He got the index right for polycarbonate, but the Rodenstocks come in
    several materials. But some retailers like Sam's may chose to only carry
    certain materials. That is their right to do so. Do not get polycarbonate.
    The material is Spectralite, one of the best materials on the market. This
    would probably be an excellent choice for your moderate Rx (and for your
    wife).
    These may be Essilor Naturals, which are not the premium PAL designs from
    Essilor (which is their Varilux line). However, you may not need a premium
    lens for your Rx (but it certainly won't hurt).
    Try different stores and ask for the lead optician if you want more help.
    Most Wal-Marts that I have visited have a least one decent optician.
    I think your best choice would probably be the Solamax in Spectralite
    material . This particular lens design is best for reading and far distance,
    but maybe not the best for middle distance (such as using a computer).

    However, if you have never worn PAL's before, be aware that they take some
    time to adjust, and the entire lens is usable for clear and sharp vision
    (the visible part is like an hour glass shape). The intermediate vision is
    often very narrow and you will need to get used to moving your head to see
    clearly from the correct portion of the lens. But if your are committed to
    getting PAL's, you will adjust, and their are many advantages, such as the
    ability see clearly at any distance (if you use the proper part of the
    lens).

    But make sure that the Solamax is Spectralite and not polycarb. Ask them to
    check on the material if they are unsure.

    CR-39 would also be a good material. The only drawback is the weight and
    thickness, but your Rx is relatively mild.

    Most independent optical shops can order just about any brand in any
    material you want. This is because they use one or more independent labs
    according to the product you need. But obviously the prices may be somewhat
    higher. However, even with independents, they tend to steer customers to one
    particular brand because the sales people often times get awards from the
    manufacturers when they sell a certain number of that brand.
     
    Mark A, Nov 25, 2004
    #3
  4. Father Times

    Mark A Guest

    I suggested that he at least try Wal-Mart. In my experience, the Wal-Mart
    opticians (or at least the lead Wal-Mart optician) is more knowledgeable and
    gives better service than the average independent optician, including those
    located in an OD office. I know there are always exceptions, but that has
    been my experience after talking to 8 different Wal-Mart opticians (8
    stores), and about a 12 independent opticians (included at the OD office)
    and about 10 chain store opticians.

    True, that the OD is usually very knowledgeable, but they usually hire the
    same cheap and unskilled labor to run the optical shops as the chain stores.
    The OD thinks they can handle any situations that the opticians cannot, but
    they rarely have time.

    The trick is, no matter where you get your glasses, to talk to the LEAD
    optician in the store. Don't be afraid to offend the inexperienced sales
    clerk, and be prepared to come back later if the lead person is not
    available. To get the best service (especially with PAL's) you have to be
    persistent.
     
    Mark A, Nov 25, 2004
    #4
  5. Father Times

    Mark A Guest

    However, if you have never worn PAL's before, be aware that they take some
    Correction:

    and the entire lens is NOT usable for clear and sharp vision
    (the visible part is like an hour glass shape)
     
    Mark A, Nov 25, 2004
    #5
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