Device and method for determining the height of the middle...

Details Device and method for determining the height of the middle... Device and method for determining the height of the middle...

2005-08-25

2009-06-02

Mack, Ricky L (Department: 2873)

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

For interpupillary distance measuring or lens positioning

C351S208000, C351S231000

Reexamination Certificate

active

07540612

ABSTRACT:
A measurement instrument and its associated method of use to record a pupil center position of a person's eye. The instrument has a chassis and a free swinging assembly that is pivotably attached to the chassis. The swinging assembly has alignment points that remain in a horizontal plane as the swinging assembly swings. The instrument is attached to a set of eyeglass that are worn on that person's head. While wearing the measuring instrument, a person is made to assume a natural head position for a specific activity. Once a natural head position is found, the swinging assembly is set into a locked position. The pupil center point can then be determined by observing the now locked alignment points from a predetermined vantage point.

REFERENCES:
patent: 4505043 (1985-03-01), Sztuka
patent: 5640775 (1997-06-01), Marshall

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