The Pupillary Distance (PD) is the distance between your pupils. In many cases, the PD is measured by an optician. Your PD becomes a part of your examination record, and can be included with the prescription upon request. If a doctor doesn't have your PD, stop by any local optical, as many providers will provide the service as a courtesy. An accurate Pupillary Distance (PD) measurement ensures proper focus when a patient looks through their eyeglass lenses...