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Pupillary distance (PD) is the measurement (in millimeters) of the distance between the pupils of your eyes. Pupillary distance is an important measurement used to determine the proper lens shape and alignment of your prescription correction to your line of vision.
Single Vision lenses only require your PD (pupil distance). Multi-Focal lenses like Progressives, Bifocals and Trifocals require you to have your MONO PD measured, and dot the pupil center on each lens with a permanent marker on the frames being used for new lenses. Following is detailed instructions for obtaining this information. Pupillary Distance, Pupil Distance or PD.