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Thread: Prp

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    Prp

    Hello everyone :), I am in prep for my boards, and have a few questions for my optician friends. My first question is, If measuring the distance between prism reference points in a pair of bifocals, is this point the distance between pd's?

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    Master OptiBoarder optical24/7's Avatar
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    The PRP on most PAL's is exactly in between the two lazer 180 engravings. Use a PAL cut-out chart to locate.

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    Thank you for the info on the progressives, but I was asking on a pair of bifocals :)

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    Master OptiBoarder optical24/7's Avatar
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    With segmented/or SV lenses you'll read the prism at the correct pupillary height/inset.

  5. #5
    One eye sees, the other feels. OptiBoard Gold Supporter
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    Quote Originally Posted by Cmp21 View Post
    Hello everyone :), I am in prep for my boards, and have a few questions for my optician friends. My first question is, If measuring the distance between prism reference points in a pair of bifocals, is this point the distance between pd's?
    Yes. Transfer to the lenses...

    http://2.bp.blogspot.com/-80VJyx0yzZ...1600/prog3.png

    ... positioned in the lensometer using the alignment marks on the lens stop.

    Best regards,

    Robert Martellaro
    Roberts Optical Ltd.
    Wauwatosa Wi.
    www.roberts-optical.com
    ~~~~~~~~~~~~~~~~~~
    An expert is a man who has made all the mistakes which can be made, in a narrow field. -Niels Bohr

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