Ophthalmic lens

Details Ophthalmic lens Ophthalmic lens

1998-08-05

2000-09-12

Epps, Georgia

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

351168, 351169, G02C 702, G02C 706

Patent

active

061167347

ABSTRACT:
An ophthalmic lens with an aspherical face is provided having a near vision region which is larger in size and wider than that of conventional multifocal lenses, and having reduced aberrations and, notably, astigmatism. Using .DELTA. to signify a difference in mean sphere between the near vision control point and the geometrical center of the lens, this is achieved by making a surface area defined by points less than 20 mm from the geometrical center of the lens, and for which cylinder is comprised between 0.42.DELTA. and 0.84.DELTA. greater than the surface area defined by points less than 20 mm from the geometrical center, and for which cylinder is less than 0.42.DELTA..

REFERENCES:
patent: 4854689 (1989-08-01), Dufour et al.
patent: 5270745 (1993-12-01), Pedrono
patent: 5488442 (1996-01-01), Harsigny et al.
patent: 5719658 (1998-02-01), Ahsbahs et al.
Guilino, Applied Optics, "Design Philosophy for Progressive Addition Lenses", 32:1:111-117, Jan. 1, 1993.
"Essilor Delta: Lenses for the Proximal Field Too," Opticien Lunetier, Apr. 1988. (Translation attached).

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