I has been wondering how a fixed descentration of 2.5 or 3.0mm on multifocals is expected to fit a custommer with far P.D. of 72mm as well as another with 60mm far P.D. Each has a different convergence.
Would this has something to do with the fact that once in a while a customer can not see thru the corridor at the same time with both eyes even if the lenses are correctly fitted?.
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