Optician's ruler with sliding height indicator

Details Optician's ruler with sliding height indicator Optician's ruler with sliding height indicator

1997-06-05

1998-10-20

Dang, Hung X.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

For interpupillary distance measuring or lens positioning

351200, A61B 310, A61B 300

Patent

active

058254595

ABSTRACT:
An optician's ruler having a generally elongated body having at least first and second principal surfaces, a first end, a second, opposing end, a first longitudinal edge and a second longitudinal edge is provided. An interpupillary distance scale is located on one of the at least first and second principal surfaces of the body. The interpupillary distance scale has indicia at regularly spaced intervals coinciding with standard units of measure to permit measurement of the distance between the pupils of a subject. A segment height scale is also located on one of the at least first and second principal surfaces of the body. The segment height scale has indicia at regularly spaced intervals coinciding with standard units of measure oriented generally perpendicular to the first longitudinal edge of the body. The optician's ruler may also be provided with a cross member for alignment of the segment height scale with the relevant reference point. Alternatively, a sliding indicator which includes a cross member can be moved along the segment height scale to accurately measure from the bottom of the lens to the desired reference point on the wearer's eye.

REFERENCES:
Catalog p. 21 for Measuring Instruments, Jan. 1997. Admitted prior art.
Catalog p. 18 for Vigor Optician's Rulers, Jan. 1997. Admitted prior art.
Catalog p. 67 for Hilco Optician's Rulers, Jan. 1997. Admitted prior art.
Catalog p. 42 for Ducal Trading Corp. Optician's Rulers, Jan. 1997. Admitted prior art.
Catalog pp. 165-167 for Miscellaneous Measuring Instruments, Jan. 1997. Admitted prior art.
Catalog p. 164 for Bernell Optician's Rulers, Jan. 1997. Admitted prior art .

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