This is the distance at which, given the average human eye rangefinder "baseline" (distance between the eyes or Inter-Pupillary Distance (IPD)) of between 2.5 and 3 inches (6 and 8 cm), the angle of an object at that distance becomes essentially the same from each eye.
Pupillary distance (PD) also describes the distance between the two pupils, but is an optometric term used to specify prescription eyewear.
distance education | 2012 World Single Distance Speed Skating Championships | National University of Distance Education | Philippine Long Distance Telephone Company | middle-distance running | Kingdom Hearts 3D: Dream Drop Distance | Distance education | Distance | women's 1000 metres distance | Pupillary distance | Minimum distance | Mahalanobis distance | Hausdorff distance | Hamming distance | European long-distance paths | Euclidean distance | distance | 2013 World Single Distance Speed Skating Championships – Women's 1000 metres | 2012 World Single Distance Speed Skating Championships – Men's 500 metres | View near Harrow on the Hill, spire of St Mary's Church visible in the distance. Francis Jukes | University of Distance Education, Yangon | Unit distance graph | Touching From a Distance | Striking Distance | Pupillary response | Pupillary light reflex | Minimum distance estimation | Middle-distance running | Long Distance Runaround | Kendall tau distance |