Interpupillary

In connexion with a somewhat extensive research into the state of refraction, visual acuity, and interpupillary distance in the girls of a school in Heidelberg, Beselin (Arch. f. Augenh., xiv. 2) gives the following results with reference to the dynamic relations of the muscles […]

I use a Bausch and Lomb Interpupillary Distance Gauge, which will give give^([sic]) the correct interpupillary distances for distance, intermediate, and close visions.

The eyepiece tubes are adjusted for the correct interpupillary distance, that is, the distance between the pupils of one's eyes.