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Thread: Root Measure Square System

  1. #1
    Master OptiBoarder
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    Root Measure Square System

    Time to rethink everything. Time to learn some new things. Time to consider what the future may hold in the next 10 years. The dioptric system may be history. I attended two seminars at VEE and read the current article in Review of Optometry. Since we use wavefront technology in refractive surgery, we have had many internal discussions as to what the future may hold. This is a very good website.
    http://scien.stanford.edu/class/psyc...eda/index.html
    Last edited by Bev Heishman; 03-26-2007 at 07:55 PM. Reason: website

  2. #2
    ATO Member HarryChiling's Avatar
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    Bev,

    As much as I would love it, don't count the dioptric system out. I think if the we were moving toward more accurate forms of expressing the refractive errors, our ANSI standards would reflect the need for the stricter tolerences, which they don't.
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    Underemployed Genius Jacqui's Avatar
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    I need time to absorb all of this.

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    Underemployed Genius Jacqui's Avatar
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    Quote Originally Posted by HarryChiling View Post
    our ANSI standards would reflect the need for the stricter tolerences, which they don't.
    Read my signature.

  5. #5
    ATO Member HarryChiling's Avatar
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    Quote Originally Posted by Jacqui
    Read my signature.
    Agree, but the trend seems to be towards looser measures, for instance from 1/8 diopters to 1/4 diopters being acceptable. I don't see the need for a change in the system used just yet. I d think the first change made could be adding a measure for HOA, but only time will tell.
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  6. #6
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    Harry,

    I don't disagree about the diopter.The phoropter and conventional spectacle correction will be here a long time. It sure explains some of those persistent unhappy patients that we see as well as reduce remakes.

    In the meantime though multiple Rx's to match the mesoptic and scotopic visual needs for the patient who demands quality vision is necessary. The ability to document the HOA and then educate the patient will result in a more positive patitn experience and value for their dollars.

    No 1/4 diopters in our office just as no rounding of prism diopters or to the nearest whole We prescribe in 1/8ths, split prism and our laboratory supplies them. It depends on your practice and the average age of the population you serve as to whether you should invest in this technology. An automated aberrometer/refractor would be a nice addition.

  7. #7
    Allen Weatherby
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    A better pair of glasses

    Bev Heishman said:
    An automated aberrometer/refractor would be a nice addition.
    I agree that a more accurate Rx is important. With contacts the data can be more closely utilized, than with a lens in a frame. This is due to the changing position of wear. Putting a pair of glasses on and keeping them within a 0.01mm is almost impossible. We can produce a surface within 0.004mm of accuracy. Traditional surfacing can not produce this repeatable accuracy.

    ANSI standards are the result of production equipment currently used by most, not on what can be done.

    The better RX combined with a better individualized lens design is the future. With frames and lenses the only limitation is how to keep the glasses located accurately without drilling the skull.

  8. #8
    Master OptiBoarder OptiBoard Silver Supporter Barry Santini's Avatar
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    It's not better precision that Ophthalmic optics needs,

    but rather a complete revision of the refractive paradigm.

    There are more differences between any 6 refractions from 6 different sources for the same patient on the SAME day, than there is between 6 pais of eyewear fabricated from 6 different places to the SAME Rx.

    Agreed??

    Barry

  9. #9
    What's up? drk's Avatar
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    Quote Originally Posted by Barry Santini View Post
    but rather a complete revision of the refractive paradigm.

    There are more differences between any 6 refractions from 6 different sources for the same patient on the SAME day, than there is between 6 pais of eyewear fabricated from 6 different places to the SAME Rx.

    Agreed??

    Barry
    Agreed!

  10. #10
    Master OptiBoarder Darryl Meister's Avatar
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    The only Zernike wavefront aberrations you can fully correct with a stationary spectacle lens are the second order terms, which are expressed as sphere and astigmatism errors, so our traditional "dioptric" system won't go away anytime soon. In fact, the diopter, itself, is a measurement of wavefront shape. However, refractions in the future may be performed to a greater lever of accuracy and precision using aberrometers that can optimize the spectacle correction based on several optical and physiological factors, including the effects of higher-order wavefront aberrations.
    Darryl J. Meister, ABOM

  11. #11
    What's up? drk's Avatar
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    Nah. (respectfully).

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