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Thread: best lens for high myopia?

  1. #1
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    best lens for high myopia?

    I could use a recommendation for the following prescription:

    O.D. Spherical -13.75, Cylindrical +1.25, Axis 105
    O.S. Spherical -15.25, Cylindrical +2.00, Axis 100

    Patient currently has a 1.66 index lens that is 4-5 years old. Thickness and weight are both a consideration, though patient is not unhappy with current thickness and weight. Current frames are 41mm, keeping thickness on the edge fairly minimal. New frame is not yet picked out, but will steer toward another small one.

    In reading past posts, I surmise that 1.74 could be noticeably thinner in this particular prescription, but would it also likely be heavier than the 1.70? Should I assume that while the 1.90 glass is even thinner, that (being glass) it would also be quite a bit heavier? Price is less important than finding the right material to use.

    Thanks for any help :)

  2. #2
    Independent Problem Optiholic edKENdance's Avatar
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    pssssssst, check my thread about -35's. A little down.

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    OptiBoardaholic Scott R's Avatar
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    I thought 1.9 glass was impossible to get in the US. If the PT can tolerate the index I would use a 1.74. Every now and then I get a few PTs that dont tolerate the 1.70 or 1.74, they always seem to come in groups.

  4. #4
    OptiWizard
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    I'm a -9.50 and while I wear CLs throughout the day, the 1.74s I also have are pretty nice.

  5. #5
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    A rigid contact, second a soft toric contact. Next the thinnest lightest material you can use for back up glasses.

  6. #6
    OptiBoard Professional Ory's Avatar
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    smells like a consumer to me. Perhaps an engineer?

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    Quote Originally Posted by midasmagoo View Post
    Should I assume that while the 1.90 glass is even thinner, that (being glass) it would also be quite a bit heavier?
    Assume that glass is heavier??? I think you may be right Ory.

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    Master OptiBoarder OptiBoard Gold Supporter DragonLensmanWV's Avatar
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    I'm a -14 and climbing. I have not tried the 1.74, but based on it's ABBE, I think your customer would be delighted with 1.70. There will be minimal thickness differences (the 1.70 will be marginally thinner) but the higher ABBE of the 1.70 over the 1.67 will be appreciated.
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  9. #9
    One of the worst people here
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    The 1.9 glass is not a nice lens. Very heavy, poor optics, and cannot be chemically or heat treated.

  10. #10
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    I would try one of the Hoya lens. Patients seem to like them very much.

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    Compulsive Truthteller OptiBoard Gold Supporter Uncle Fester's Avatar
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    My 2 cents...

    Quote Originally Posted by midasmagoo View Post
    I could use a recommendation for the following prescription:

    O.D. Spherical -13.75, Cylindrical +1.25, Axis 105
    O.S. Spherical -15.25, Cylindrical +2.00, Axis 100

    Patient currently has a 1.66 index lens that is 4-5 years old. Thickness and weight are both a consideration, though patient is not unhappy with current thickness and weight. Current frames are 41mm, keeping thickness on the edge fairly minimal. New frame is not yet picked out, but will steer toward another small one.

    In reading past posts, I surmise that 1.74 could be noticeably thinner in this particular prescription, but would it also likely be heavier than the 1.70? Should I assume that while the 1.90 glass is even thinner, that (being glass) it would also be quite a bit heavier? Price is less important than finding the right material to use.

    Thanks for any help :)
    It ain't broke. Don't fix it!

  12. #12
    Compulsive Truthteller OptiBoard Gold Supporter Uncle Fester's Avatar
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    Some difference!!!

    Just for fun I plugged into the opticampus calculator:

    -13.00 sph pd 60 eyesize 42-20

    I.67 MR10 6.5mm at x180
    1.74 6.0mm " " "

  13. #13
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    Thanks for all of the helpful replies so far.

    Quote Originally Posted by Uncle Fester View Post
    It ain't broke. Don't fix it!
    Agreed, though 1) 41mm frames aren't so easy to find (current frames need to be replaced) so the thickness may go up in a new frame and 2) Nothing wrong with even a little thinner and lighter.

    Quote Originally Posted by Uncle Fester View Post
    Just for fun I plugged into the opticampus calculator:

    -13.00 sph pd 60 eyesize 42-20

    I.67 MR10 6.5mm at x180
    1.74 6.0mm " " "
    Ah, some info I can sink my teeth into. Thank you. I will assume that the 1.70 Hoya would fit in between the two figures.

    Quote Originally Posted by SpecFitter View Post
    I would try one of the Hoya lens. Patients seem to like them very much.
    Yes, in doing some more reading through the threads here it seems more folks prefer the Hoya over the 1.74 options (though many DO like the 1.74 lens). Does anyone know if the SHV coating is worth the extra cost over the included HV coating?

    Quote Originally Posted by Ory View Post
    smells like a consumer to me.
    D'oh! Really, it isn't my intention to "try" to fool anyone. I will be using a local professional retailer. I most trust the retailer in my Doc's office, but the supply of frames is abysmal (none that are under 44mm, and no willingness to find some different ones.) The larger local retailers (bigger frame selections, though still very few choices in a small frame) haven't had near the information on lenses to share with me that I have been able to find here. The last one I went to insisted that I wouldn't feel the weight difference in the 1.9 glass because it was thin enough to make up the difference (I was skeptical, as has been confirmed in this thread by some of the replies). He was really pushing that option over hi-index plastic.

    Anyway, if I'm not supposed to be here then I will take my leave. Thank you again for the helpful info.

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    Cape Codger OptiBoard Gold Supporter hcjilson's Avatar
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    Its not nice to misrepresent yourself on Optiboard. Thread closed! Poster cautioned as you can plainly see.
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