Aspherical diffractive ophthalmic lens

Details Aspherical diffractive ophthalmic lens Aspherical diffractive ophthalmic lens

2006-07-11

2006-07-11

Sugarman, Scott J. (Department: 2873)

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

C351S161000

Reexamination Certificate

active

07073906

ABSTRACT:
A multifocal ophthalmic lens includes a lens element having anterior and posterior surfaces with a central aspherical refractive zone disposed on one of the anterior and posterior surfaces; and a diffractive bifocal zone disposed outside of the aspherical refractive zone. The central aspherical refractive zone may be disposed on the anterior surface and the diffractive bifocal zone may be disposed on the posterior surface.

REFERENCES:
patent: 5229797 (1993-07-01), Futhey et al.
patent: 5408281 (1995-04-01), Zhang
patent: 6685315 (2004-02-01), De Carle
Cohen, Allen Louis, “Diffractive Bifocal Lens Designs,” Optometry and Vision Science, vol. 70, No. 6, pp. 461-468, 1993 Americal Academy of Optometry.
Klein, Stanley A., “Understanding the Diffractive Bifocal Contact Lens,” Optometry and Vision Science, vol. 70, No. 6, pp. 439-460, 1193 American Academy of Optometry.

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