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Thread: progressive markings on glass

  1. #1
    Bad address email on file fvc2020's Avatar
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    progressive markings on glass

    Hello

    I was just trying to read a pair of glass progressives, and was having some trouble doing so. Now I'm really good at finding the marks. I dotted up what I thought was where the fitting cross was, and still couldn't find the markings. What am I missing?

    Just having a dumb moment

    Christina

  2. #2
    Objection! OptiBoard Gold Supporter shanbaum's Avatar
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    Quote Originally Posted by fvc2020
    Hello

    I was just trying to read a pair of glass progressives, and was having some trouble doing so. Now I'm really good at finding the marks. I dotted up what I thought was where the fitting cross was, and still couldn't find the markings. What am I missing?

    Just having a dumb moment

    Christina
    They should be 17mm on either side of a point 2-4mm below the fitting cross.

    But I'm not sure how you found that first.

  3. #3
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    Verifying glass progressives

    If you cannot find the marks on a glass progressive try to find the MRP. At the MRP there should be base down prism = to 2/3 of the add power if there was equi thin or prism thinning done otherwise there should be no vertical prism. dot this point and measure 17mm out in each direction. The fitting cross should be somewhere between 2 and 6 mm above this point (depends on brand). It may not be perfect but it will be prettu close to the actual marks

    Ed

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