Inter-pupillary distance

Inter-pupillary distance

InterPupillary Distance (IPD). This is the distance between the two eyes of a human being, measured at the pupils. It is significant in the design of eye-glasses, binoculars, and in the need or otherwise for stereoscopic vision. See also under Head-Mounted Displays (HMDs)

* The 95 percentile adult male in the USA has an IPD of 70 mm (2.8 in) and the 5 percentile, 58 mm (2.3 in).

* For adult females in the USA the figures are 65 and 53 mm (2.6 and 2.1 in).

* For Europeans the figures are 1 mm smaller than the above.

* The IPD is one of the many measurements used in anthropometry, measurements of the human body. The statistical spread of these measurements, usually expressed as percentiles, is used for many purposes. In the case of IPD, it is used inspecifying the size range for eyeglasses (spectacles), binoculars and other optics such as Head-Mounted Display systems.

* From the above figures, if a 95 percentile US male and a 5 percentile European female are to be accommodated, the IPDadjustment must be at least 52 - 70 mm, but if adult Japanese people or US/European children are to be included, a lower IPDdstance will be required.

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