1.6 High Index Help!!!!!

Discussion in 'Optometry Archives' started by Toyman, Jun 24, 2006.

  1. Toyman

    Toyman Guest

    I recently purchased a pair of glasses at Walmart....They were the
    polycarbonate with their standard ar coating.The vision was great
    looking straight ahead,however,the peripheral vision was terrible &
    ultimately I ended up returning them.I am now in the process of trying
    another pair through my optometrist who is suggesting Essilor 1.6
    lenses w/Crizal Alize......With what little I do know about lenses,this
    doesn't sound like the best option for me (O.D. -4.75 -0.75 145)
    (O.S. -5.00 -0.50 20). I thought either Hoya Eyas 1.6 W/Superhivision
    AR or AO XT16 1.6 W/Teflon AR would be a better match for me(both
    finished versions).....I am torn between the two...it seems like the
    Hoya AR coating is better than the Teflon but the AO XT16 seems like a
    better lens. I am very picky about clear sharp vision & cannot tolerate
    much in the way of distortion ie "fun house effect" I get dizzy &
    disoriented if the appearance is not flat & natural looking. Any
    thoughts would be appreciated!

    Thanks!
    Ricky
     
    Toyman, Jun 24, 2006
    #1
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  2. Toyman

    Mark A Guest

    Polycarbonate has the worst optical properties of any commercially available
    lens that is commonly dispensed. It is especially troublesome with
    peripheral vision on aspheric lens designs and progressives. You did not
    state exactly which Essilor lens design you were given, but I am assuming
    that it was probably aspheric with your Rx.

    Essilor 1.60 plastic is much less prone to chromatic aberration and
    peripheral blurring than polycarbonate. The Crizal Alize AR is coating is
    generally well regarded as durable and easy to clean (compared to other AR
    coatings).

    Hoya single vision lenses are available in a standard Hi-lux spheric, or an
    improved Nulux aspheric which results in less deformation in the periphery
    of the lens. I am not sure how this relates to "Supervision" but if it is
    the same as Nulux, then it might be better than the standard Essilor
    aspheric design. Ask your optician about what Supervision means, or contact
    for more information.

    The Hoya Eyas 1.6 has very good abbe value of 41 compared to Essilor 1.60
    index which is 36 (the higher the abbe value the lower the chromatic
    aberration which can affect peripheral vision). Polycarb has an abbe value
    of 30 (not acceptable in my opinion).

    If you think you need a lens with safety properties (high impact resistance
    and tensile strength) of polycarbonate, but with excellent optical
    properties (abbe value 43), I would highly recommend the Hoya Phoenix
    (Trivex) lens material. At 1.53 index, Trivex is not as quite thin as 1.6 so
    there may be cosmetic concerns relating to edge thickness if that is a big
    issue with you.
     
    Mark A, Jun 24, 2006
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  3. Toyman

    Mark A Guest

    The original poster Rx does not specify any add (reading) power. Also, the
    AO XT16 that was mentioned is a SV lens design from American Optical. So I
    don't think the OP is looking at progressives.
     
    Mark A, Jun 24, 2006
    #3
  4. Toyman

    Toyman Guest

     
    Toyman, Jun 24, 2006
    #4
  5. Toyman

    Toyman Guest

    Sorry for the confusion.......This is for a single vision lens & I
    believe the Essilor product he is recommending is their Thin and Light
    1.6........Also, the frame is fairly small, Safilo E7066. So with this
    additional info, would I be better suited to the Hoya Eyas 1.6 (Nulux
    EP) with their "superhivision AR coating" or AO XT16(Finalite),
    Considering my main concerns are clear & natural looking vision with
    minimal peripheral distortion. I have also heard of a material called
    Spectralite, would that be a consideration?
    The Hoya Phoenix & Trivex mentioned by Mark, sound interesting also,
    although high impact resistance is not a concern for me.
    Thanks for any info!

    Ricky
     
    Toyman, Jun 24, 2006
    #5
  6. Toyman

    Mark A Guest

    There is no need to apologize, it was very clear that you were talking about
    SV lenses. The Rx left no doubt about that (thank you for posting your Rx).

    Spectralite and Finalite are proprietary lens materials from Sola (who now
    owns AO). Spectralite is 1.54 index with abbe value of 47 and Finalite is
    1.60 index with abbe value of 42 (pretty close to the Hoya Eyas 1.6 with an
    abbe value of 41). The Essilor 1.6 has an abbe value of 36. The higher the
    abbe value, the lower the chromatic aberration. Polycarb has an abbe value
    of 30.

    Spectralite (like Trivex) has a relatively high abbe value, but you will
    have slightly thicker lenses at the edges (for a minus Rx) compared to
    higher index lenses because of the 1.54 index. If edge thickness is not a
    concern, then Sola Spectralite is a very good choice, as is Trivex (with the
    added strength). But since the Safilo E 7076 is a traditional frame (not a
    drill mount) then strength of lens is not quite as important (unless you
    wear your glasses while playing sports or in hazardous areas).

    It looks like either the Finalite 1.60 (Sola or AO) or the Hoya Eyas 1.60
    would be the best choices for your Rx. I might be tempted to go with the
    Hoya if you knew it was the Nulux aspheric model. Otherwise it would be a
    toss-up between Sola/AO 1.60 Finalite or the Hoya Eyas 1.60.
     
    Mark A, Jun 25, 2006
    #6
  7. Toyman

    Toyman Guest

    Thanks for all the input!.......I believe I have decided to go with the
    Hoya Eyas 1.6 .....unfortunately here in the U.S. Nulux does not appear
    to be available, However, I still feel that the Hoya AR is slightly
    superior to the Sola Teflon....it also has a "lifetime of the
    prescription" warranty vs 2 years on Teflon (my last prescription
    lasted approx 8 years). So these reasons have given the edge to Hoya.

    Thanks Again!
    I really appreciate all the help/suggestions!!!!!!!!!
     
    Toyman, Jun 25, 2006
    #7
  8. Toyman

    Mark A Guest

    Just keep one thing in mind. The warranty for AR coating is for
    manufacturing defects such as peeling, fading, etc. The warranty does not
    cover scratches from normal wear and tear. Because of the delicate nature of
    AR coatings, it is unlikely (but not impossible) that you can keep your
    lenses scratch free for 8 years. But in any case, be very careful with your
    lenses and learn how to clean them without scratching the relatively
    delicate AR surface.
     
    Mark A, Jun 26, 2006
    #8
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