Lensometer with guided lens movement for progressive addition le

Details Lensometer with guided lens movement for progressive addition le Lensometer with guided lens movement for progressive addition le

1992-07-17

1994-04-12

Warden, Robert J.

Optics: measuring and testing

Lens or reflective image former testing

For optical transfer function

356127, G01B 900

Patent

active

053030222

ABSTRACT:
A computer indicated lens movement direction protocol is utilized in combination with a lensmeter to designate required movement of lenses with respect to a lensmeter to insure sequential measurement of progressive addition lenses. Lens measurement occurs at four sample points closely spaced on the lens surface. The system uses power variations (PV.sub.1 and PV.sub.2) at each of the spaced apart lens sampling points to indicate when sampling of the lens occurs in a region of constant spherical power, when sampling of the lens occurs in a region of changing spherical power, and finally when sampling again occurs in a region of constant and increased spherical power. When sampling of the lens occurs in a region of changing power, lens movement is guided along a path of constantly changing sphere utilizing changes in astigmatism measured in the 45.degree.-135.degree. directions (C.sub.X). A lens examination protocol is set forth with vector indicators setting forth the vertical direction required for movement as well as both desired left and right movement to maintain the shortest possible path between the respective lens portions.

REFERENCES:
patent: 3981589 (1976-09-01), Spitzberg
patent: 4070115 (1978-01-01), Humphrey
patent: 4180325 (1979-12-01), Humphrey
patent: 4640596 (1987-02-01), Humphrey
patent: 4730924 (1988-03-01), Allard et al.
patent: 5100232 (1992-03-01), Smith et al.
patent: 5173739 (1992-12-01), Kurachi et al.
"Development of Variable-Focus Lenses and a New Refractor", Journal of the American Optometric Association, Apr., 1977.
"A Remote Subjective Refractor Employing Continuously Variable Sphere-Cylinder Corrections", Feb., 1976 article by William E. Humphrey, Ph. D.

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