Pupillary distance (PD), more correctly known as interpupillary distance (IPD) is the distance in millimeters between the centers of each pupil. == Interpupillary Distance Classifications == Distance PD is the separation between the visual axes of the eyes in their primary position, as the subject fixates on an infinitely distant object.
Pupillary distance (PD), more correctly known as interpupillary distance (IPD) is the distance in millimeters between the centers of each pupil. == Interpupillary Distance Classifications == Distance PD is the separation between the visual axes of the eyes in their primary position, as the subject fixates on an infinitely distant object.
Source: Wikipedia "Pupillary distance" · CC BY-SA 4.0
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