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What is PD?

Your PD stands for Pupillary Distance, which is the distance between your pupils in millimeters. Your PD is very important for accurately fitting your lenses to achieve visual acuity.
Generally speaking, the PD number of adults stays the same. The average PD for adults is 55-75 mm and for kids is about 42-55 mm. A difference of 2-3 mm is allowable.
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