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Thread: Base curve chart

  1. #1
    Bad address email on file Lawman Nick's Avatar
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    Base curve chart

    Does anybody have a handy dandy base curve chart link, or pic? We've had a pt come in a +5.00 in a 5b, and I gotta make sure thats right.

  2. #2
    Master OptiBoarder OptiBoard Silver Supporter Barry Santini's Avatar
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    There’s nothing “right” about it according to Wollaston or Ostwalt.
    B

  3. #3
    Bad address email on file Lawman Nick's Avatar
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    Quote Originally Posted by Barry Santini View Post
    There’s nothing “right” about it according to Wollaston or Ostwalt.
    B
    PT is single vision, and is in hi index 1.74. The only chart I have in the office is a single vision c-39, which according to the chart, should put it in 7b, only thing is, I'm almost certain that the material will make a significant difference.

    rx is :
    od: +5.25 -5.25 60
    os: +5.25 -4.00 107

  4. #4
    OptiWizard
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    Larger labs utilize proprietary software that will optimize bevel placement and profile to insure proper fit in the frame with a highly accurate first time cut rate. In order to achieve this, base curve of the lens must closely match the frames wrap profile which in most cases is between 4 and 5 base. Having worked for a "large lab", powers such as the one you mention where indeed processed on a 5 base. BTC curves would consistently range in the flatter range lower than the customary -3.00 and above.

    When I questioned this new practice I was advised by a "lens engineer" that research didn't show any notable decrease in patient comfort from wearing flatter lenses. After a period of time I was convinced that this new practice might be ok since some of the Rx's I thought might be rejected never where sent back.

  5. #5
    Bad address email on file Lawman Nick's Avatar
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    Thanks everybody, we got the problem solved, and the answer was very stupid. I appreciate both of you.

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    Master OptiBoarder AngeHamm's Avatar
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    Quote Originally Posted by Lawman Nick View Post
    we got the problem solved, and the answer was very stupid.
    Ain't it always the way.
    I'm Andrew Hamm and I approve this message.

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