Thinnest point vs optical center - prism effect?

Discussion in 'Optometry Archives' started by DONALD KOCHER, Feb 6, 2008.

  1. My prescription is: OD -4.50 -0.50 135, OS -1.75 -4.25 175, BIFOCAL ADD: OD
    +2.00 OS+2.00 (Half moon). There is no prism called for in the prescripton.

    The thinnest point of the right lens is 3 mm higher than the left. This was
    measured from the seg line. I think this is called "induced prism" or
    "prism by decentration".

    The optician maintains that the optical centers (OC) are correct and that
    there is no prism in the glasses. The optician also says that the OCs do not
    correspond to the thinnest point of the lens because they are bifocals.

    Is it possible that these glasses do not have prism?
    DONALD KOCHER, Feb 6, 2008
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