Inter pupillary 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. IPD is the most
important inter orbital parameter for measuring the distance between the
eyeballs. The clinical importance of IPD is to facilitate the correct
positioning of ophthalmic lenses before the eyes to eliminate unwanted strain
on the eyes due to induced prismatic effects from the lenses.
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