Distance in millimeters between the centers of each pupil
Pupillary distance (PD), more correctly known as interpupillary distance (IPD) is the distance in millimeters between the centers of each pupil.[1]
- ^ Bogren HG, Franti CE, Wilmarth SS. Normal variations of the position of the eye in the orbit. Ophthalmology. 1986;93:1072–1077.