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Thread: Measuring center thickness

  1. #1
    OptiBoard Apprentice OptiBoard Bronze Supporter Eyez53's Avatar
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    Question

    Where on the lens do you place your calipers to measure the true centers on either a high-index or a polycarb lens? I am especially interested in where on a progressive does the "sweet spot" lie. Not a "newbie", just having a friendly dispute with the lab.

    Thanks!

  2. #2
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    Post

    The OC on the lens is where to find the true center thickness. On a Progressive check at the major reference point.

    Jerry


  3. #3
    Objection! OptiBoard Gold Supporter shanbaum's Avatar
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    Question

    Originally posted by Eyez53:
    Where on the lens do you place your calipers to measure the true centers on either a high-index or a polycarb lens? I am especially interested in where on a progressive does the "sweet spot" lie. Not a "newbie", just having a friendly dispute with the lab.

    Thanks!
    The center thickness of any lens should be measured at the Prism Reference Point. On progressives, this is specified by the manufacturer and identified by an ink dot, two to four millimeters below the Layout Reference Point (a/k/a "Fitting Cross").

    The index of the material has no bearing on where to measure.


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