<P> In very young children and babies, where the patient is unlikely to stay still, the optical professional will typically measure from one medial canthus to the other lateral canthus . </P> <Table> <Tr> <Td> </Td> <Td> This section does not cite any sources . Please help improve this section by adding citations to reliable sources . Unsourced material may be challenged and removed . (October 2016) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This section does not cite any sources . Please help improve this section by adding citations to reliable sources . Unsourced material may be challenged and removed . (October 2016) (Learn how and when to remove this template message) </Td> </Tr> <Ul> <Li> The typical pupillary distance for adults is around 54--68 mm, while measurements generally fall between 48 and 73 mm . </Li> <Li> For children the measurement usually ranges from 41 to 55 mm . </Li> <Li> The 95 percentile adult male in the USA has an IPD of 68 mm (2.7 in) and the 5 percentile, 55 mm (2.2 in). Those are each the 5% of USA men at the far range and short range, respectively . </Li> <Li> For adult females in the USA the figures are 64 and 53 mm (2.5 and 2.1 in). </Li> <Li> For Europeans the figures are 1 mm less than the above . </Li> <Li> 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 in specifying the size range for eyeglasses, binoculars and other optics such as head - mounted display systems . </Li> <Li> From the above figures, if a 95 percentile US male and a 5 percentile European female are to be accommodated, the IPD adjustment must be at least 52--70 mm, but if adult Asian people or US / European children are to be included, a lower IPD distance will be required . </Li> </Ul>

What's the difference between dist pd and near pd