Lens meter and method of measurement of progressive multifocal l

Details Lens meter and method of measurement of progressive multifocal l Lens meter and method of measurement of progressive multifocal l

1986-02-28

1988-03-15

Rosenberger, R. A.

Optics: measuring and testing

Lens or reflective image former testing

Focal length measuring

356129, G01B 900

Patent

active

047309245

ABSTRACT:
Lens meter and method of measurement of progressive multifocal lens using the same which is able to set the amount of movement of the lens and to simply position a far- or near-distance refraction characteristics-measuring portion of a progressive multifocal lens. In accordance with the method the optical center of a lens is first found from measurement employing the lens and using the optical center as point of origin, the lens is moved by a distance up to the far-distance refraction characteristics measuring portion and the near-distance refraction characteristics measuring portion of the lens mentioned by the lens manufacturer, so as to effect alignment with the measurement optical axis of the lens meter, thereby measuring the refraction characteristics of each measuring portion.

REFERENCES:
patent: 3492075 (1970-01-01), Davis
patent: 3618271 (1971-11-01), Martiros
patent: 4330203 (1982-05-01), Oppenheim et al.

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