Interpupillary distance measuring device

Details Interpupillary distance measuring device Interpupillary distance measuring device

1987-11-05

1989-04-04

Buczinski, Stephen C.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

For interpupillary distance measuring or lens positioning

33200, A61B 310

Patent

active

H00006181

ABSTRACT:
An instrument for measuring the interpupillary distance of a subject is described which comprises two parallel sighting tubes disposed in adjustable spaced relationship along parallel optical axes and interconnected for measuring the spacing between the axes, two eyepiece lenses of preselected equal focal length disposed at corresponding first ends of the sighting tubes, first and second translucent targets bearing recognizable indicia disposed along respective sighting tubes a distance from the lenses equal to the focal length, and an aperture near each lens for limiting the size of the field of view along each optical axis.

REFERENCES:
patent: 1327163 (1920-01-01), Mathewson et al.
patent: 2361534 (1944-10-01), Eppenstein
patent: 2380263 (1945-07-01), Rees
patent: 4212538 (1980-07-01), Esmond
patent: 4244639 (1981-01-01), Kanda
patent: 4364645 (1982-12-01), Feinbloom
patent: 4626088 (1986-12-01), Joncour et al.

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