Between the pupils.
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in·ter·pu·pil·lary .int-ər-'pyü-pə-.ler-ē adj extending between the pupils of the eyes also extending between the centers of a pair of spectacle lenses <\interpupillary distance>
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in·ter·pu·pil·lary (in″tər-puґpĭ-lar″e) between the pupils.Medical dictionary. 2011.