Progressive multi-focal ophthalmic lens

Details Progressive multi-focal ophthalmic lens Progressive multi-focal ophthalmic lens

1989-12-20

1990-08-21

Sugarman, Scott J.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

350432, 350452, G02C 706, G02B 308, G02B 310

Patent

active

049500570

ABSTRACT:
A progressive multi-focal ophthalmic lens having a front refracting surface and a rear refracting surface one of which is a progressive surface whose refractive power changes continuously with the other being a non-progressive surface. The progressive surface is formed as a Fresnel lens surface composed of microscopic steps so that the macroscopic shape of the progressive surface generally conforms to that of the non-progressive surface.

REFERENCES:
patent: 3904281 (1975-09-01), Jampolsky
patent: 4070105 (1978-01-01), Marzouk
patent: 4162122 (1979-07-01), Cohen
patent: 4210391 (1980-07-01), Cohen
patent: 4338005 (1982-07-01), Cohen
patent: 4340283 (1982-07-01), Cohen
patent: 4729651 (1988-03-01), Kitani
Ziegler, J. F., "Fabrication or Correction of Optical Lenses"; IBM Technical Disclosure Bulletin; vol. 12, No. 10; Mar. 1970; pp. 1573-1575.
Journal of the Optical Society of America, vol. 64, No. 4, "Primary Aberrations of Fresnal Lenses", by Erwin Delano, pp. 459-468.

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