Lens meter for testing progressive lens

Details Lens meter for testing progressive lens Lens meter for testing progressive lens

1993-02-03

1995-05-09

Limanek, Robert P.

Optics: measuring and testing

Lens or reflective image former testing

Optical center, cylinder axis, or prism measuring or...

356124, G01B 900

Patent

active

054145058

ABSTRACT:
A lens meter having an optical measuring system which can measure optical characteristics of a progressive lens includes a memory means which stores the optical characteristics of each measuring point measured in a range from a far vision region to a near vision region by the optical measuring system, a distinguishing means which compares the optical characteristics of each measuring point stored in the memory means and distinguishes whether the measured points belong to a progressive band or areas located in both right and left sides of the progressive band, a display means which displays a result of the distinguishing means. With this structure, the optical characteristics of each measuring point can be measured ranging from the far vision region to the near vision region by the optical measuring system, and the results are stored in the memory means. Next, by means of the distinguishing means, the optical characteristics of each measuring point are compared and distinguished whether the measured points belong to the progressive band or the areas located in both right and left sides of the progressive band. This distinguished result is displayed by the display means. Thus, the measuring position of the progressive lens can be easily recognized, and thus the near vision power can be accurately measured.

REFERENCES:
patent: 4730924 (1988-03-01), Allard et al.
patent: 5173739 (1992-12-01), Kurachi et al.
patent: 5303022 (1994-04-01), Humphrey et al.

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