Interpupillary distance has been
defined by various authors as the distance between the centres of the pupils in
millimetres. It is abbreviated as PD, or more correctly, IPD. Normal values of
IPD for the Ghanaian student population have been established. The IPD values
are relevant for the manufacture of spectacles corrections for the Ghanaian
student population. Different experimental techniques, differences in sample
sizes, differences in age ranges and limited background information about study
subjects hinder the generalization of IPD values for different sets of people
from different ethnic backgrounds.
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