Method and device for measuring pupil distance

Details Method and device for measuring pupil distance Method and device for measuring pupil distance

2008-01-29

2008-01-29

Stultz, Jessica T (Department: 2873)

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

For interpupillary distance measuring or lens positioning

C351S200000, C351S206000, C351S205000

Reexamination Certificate

active

07322697

ABSTRACT:
There is provided a method of measuring a pupil distance, which includes locating an imaging device at a position a predetermined distance away from a member attached to eyeglasses worn by a subject. The member has two indicators. The method further includes photographing the subject while the subject observes an observing point in the vicinity of the imaging device, measuring an apparent distance E between left and right pupils on a photographed image, and obtaining an interpupillary distance PD in accordance with PD=[(A+B)×C×E]/(A×D) where “A” represents a distance between the member and the imaging device, “B” represents a distance between a center of rotation and the member, “C” represents an actual distance between the indicators, and “D” represents an apparent distance between the indicators.

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Excerpt from “Optical Tools & Accessory” 2004 General Catalog of San Nishimura Co. Ltd., Product Nos. 455, 456, and 457 together with an English language translation of the same.
U.S. Appl. No. 09/611,364 to Abe et al., filed Jul. 6, 2000.

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