Multifocal ophthalmic lens

Details Multifocal ophthalmic lens Multifocal ophthalmic lens

1999-06-29

2000-08-15

Sugarman, Scott J.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

G02C 706

Patent

active

061025445

ABSTRACT:
In a multifocal ophthalmic lens comprising an aspherical surface having at every point thereon a mean sphere and a cylinder, a far vision region, a near vision region, and an intermediate vision region, the length of progression i.e. the length over which lens power varies by a set amount in different regions of the lens, is short. To avoid distortion at the periphery of the lens which this would otherwise occasion, the isosphere and isocylinder lines are distributed over the surface of the lens so as to ensure variations in sphere are not too sudden along a 20 mm radius circle centered on the geometric center of the lens and variations in cylinder on the surface of the lens inside this circle are also very small. The lens has an enlarged near vision region and progression is less perceptible to the wearer.

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.
patent: 5949519 (1999-09-01), Le Saux 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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