Automatic lensmeter for progressive addition lens

Details Automatic lensmeter for progressive addition lens Automatic lensmeter for progressive addition lens

1991-07-03

1992-12-22

Evans, F. L.

Optics: measuring and testing

Lens or reflective image former testing

For optical transfer function

356127, G01B 900

Patent

active

051737396

ABSTRACT:
An automatic lensmeter according to the present invention is used for accurately measuring optical characteristics of a lens to be examined. The automatic lensmeter incorporates a mode change-over switch for switching to an addition diopter measurement mode, memory means for storing cylindrical diopter of a measured far-vision area of the lens, calculation means for calculating a difference between the cylindrical diopter measured in the addition diopter measurement mode and the cylindrical diopter of the far vision portion, and display means for indicating a calculated result of the calculation means thereon.

REFERENCES:
patent: 4730924 (1988-03-01), Allard et al.

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