Interpupillary distance measuring device with no moving parts

Details Interpupillary distance measuring device with no moving parts Interpupillary distance measuring device with no moving parts

1990-04-23

1991-07-23

Dzierzynski, Paul M.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

For interpupillary distance measuring or lens positioning

351209, A61B 310

Patent

active

050338404

ABSTRACT:
An interpupillary distance measuring device comprises a box with a front panel whose position corresponds to an eyeglass frame. The device has a main axis perpendicular to the front panel and equidistant from the eyes of the subject. A horizon plane perpendicular to the plane of the face passes through the main axis and the eyes of the subject. In the box are a master lens and a point light source at the focus of the lens and on the main optical axis. The point source creates at the center of the eyes of the subject corneal reflections, virtual images of which are formed by the lens. These virtual images form real objects for an objective lens which forms a pair of real images on a measurement scale formed by one or more linear arrays of photosensitive charge transfer devices. The device scans sequentially to identify the elements of the arrays at which the images are formed by means of the rank of those elements.

REFERENCES:
patent: 4591246 (1986-05-01), Cousyn et al.
patent: 4712895 (1987-12-01), Kamiyama et al.
patent: 4881806 (1989-11-01), Bovet

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