Average Distance Between Pupils
Average Distance Between Pupils . Stand about eight inches (20 cm) away from a mirror. Pupillary distance (pd) means the distance between your pupils. How to measure your pupillary distanceHow to measure your pupillary from leoptique.com Pupillary distance (pd) is the distance between the centers of your pupils measured in millimeters. Stand in front of a mirror and hold the ruler horizontal. Near centration distance (cd) is the distance between the visual axes in a spectacle plane when viewing a near target.