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Thread: PD Adjustment for Intermediate/Reading Progressive Lens ?

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    PD Adjustment for Intermediate/Reading Progressive Lens ?

    Hi Guys,
    I'm seeing conflicting PD for this type of lens. It is based on the manufacturer?
    For a regular Distance/Reading PAL the Distance PD is used - standard. For the Intermediate/Reading PAL I see some say to use the Distance PD while others say to use the Intermediate PD. What is the optically correct answer?

    PS - I know if we're making a Single Vision Intermediate (Computer) lens we usually reduce the Distance PD by 1.5mm. Is it the same for an Intermediate/Reading PAL?

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    What's up? drk's Avatar
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    If you use the intermediate p.d. the software's going to use that to calculate standard near inset, and it will be too much.

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    Just use an “office reader” style of digressive design and reduce the pd by .5mm
    or 1mm OU if you must. DPD will be fine. Sigh.
    I bend light. That is what I do.

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    What's up? drk's Avatar
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    Cranky, cranky...

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    Yep.
    I bend light. That is what I do.

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    It seems to be a gray area because even now if you Google occupational lenses which are really computer progressive the different lens manufacturers are not on the same page. Some say use intermediate PD and others say Distance PD. I usually just minus 1mm from the distance PD until I saw it I thought I was doing it wrong.
    Thank you all for your clarification.

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    My local lab always requires distance mono pds for near variable focus lenses.

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    Quote Originally Posted by drk View Post
    Cranky, cranky...
    Must be a case of the Mondays...

    Quote Originally Posted by mervinek View Post
    My local lab always requires distance mono pds for near variable focus lenses.
    Mine too.

    There was a post here awhile ago discussing distance pd's for reading glasses, I'm sure Uncle Fester will find it before me but I will try and look for it.

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    Quote Originally Posted by onthegrind View Post
    Hi Guys,
    I'm seeing conflicting PD for this type of lens. It is based on the manufacturer?
    I remember one manufacturer, maybe Zeiss, asking for the near pd on a task PAL, but I might be misremembering the context.

    To the best of my knowledge all task PALs used today require a distance pd.

    Hope this helps,

    Robert Martellaro
    Roberts Optical Ltd.
    Wauwatosa Wi.
    www.roberts-optical.com
    ~~~~~~~~~~~~~~~~~~
    Science is a way of trying not to fool yourself. - Richard P. Feynman

    Experience is the hardest teacher. She gives the test before the lesson.



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    Quote Originally Posted by NAICITPO View Post
    There was a post here awhile ago discussing distance pd's for reading glasses, I'm sure Uncle Fester will find it before me but I will try and look for it.
    This may help.

    https://www.optiboard.com/forums/sho...eading-glasses
    Roberts Optical Ltd.
    Wauwatosa Wi.
    www.roberts-optical.com
    ~~~~~~~~~~~~~~~~~~
    Science is a way of trying not to fool yourself. - Richard P. Feynman

    Experience is the hardest teacher. She gives the test before the lesson.



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    Master OptiBoarder OptiBoard Silver Supporter lensmanmd's Avatar
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    Quote Originally Posted by Robert Martellaro View Post
    I remember one manufacturer, maybe Zeiss, asking for the near pd on a task PAL, but I might be misremembering the context.

    To the best of my knowledge all task PALs used today require a distance pd.

    Hope this helps,

    Robert Martellaro
    Sola Access/Synchrony
    I bend light. That is what I do.

  12. #12
    OptiWizard
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    Quote Originally Posted by Robert Martellaro View Post
    +1

    Thanks!

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    Quote Originally Posted by lensmanmd View Post
    Sola Access/Synchrony
    That's one. I now remember Darryl explaining their rational behind using the near pd but I can't remember the details. I can't even find my car keys for chrissake.
    Roberts Optical Ltd.
    Wauwatosa Wi.
    www.roberts-optical.com
    ~~~~~~~~~~~~~~~~~~
    Science is a way of trying not to fool yourself. - Richard P. Feynman

    Experience is the hardest teacher. She gives the test before the lesson.



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    Master OptiBoarder OptiBoard Silver Supporter lensmanmd's Avatar
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    Quote Originally Posted by Robert Martellaro View Post
    That's one. I now remember Darryl explaining their rational behind using the near pd but I can't remember the details. I can't even find my car keys for chrissake.
    No worries. Until we eliminated the Access over 7 years ago, and went to IOT Office, I had to send daily reminders on how to enter RX and PDs for the Access to our front line opticians. I definitely don’t miss it, and the resulting call stacks. One would think that LDOs and ABOs wouldn’t need daily reminders?
    I bend light. That is what I do.

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