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Thread: Prism Reference Point

  1. 09-28-2007, 09:30 AM #1
    tktien
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    Prism Reference Point

    Why some of the PAL PRP (prism reference point)2mm below fitting point, and some of them is 4mm below, does it mean the PAL more soft or hard?Please give me some idea
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  2. 09-28-2007, 09:54 AM #2
    Uncle Fester
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    No rhyme or reason...

    There is no reason why they do this. We opticians all wish they would make it one way. Maybe in the future they will hear us and change but right now we are stuck.
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