Contact lens having an optical zone having at least one focal po

Details Contact lens having an optical zone having at least one focal po Contact lens having an optical zone having at least one focal po

1994-10-28

1997-02-25

Sugarman, Scott J.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

G02C 704

Patent

active

056063784

ABSTRACT:
A contact lens which has a centrally located optical zone. The optical zone is subdivided into at least one distance area having at least one focal point and at least one reading area having at least a further focal point. The distance area is located exclusively in the uppermost portion and the reading area is located exclusively in the lowermost portion of the optical zone. The upper edge of the contact lens has a greater curvature than the two side edges thereof, so that the shape of the lens is oval having a larger vertical than horizontal dimension. Preferably, the lower edge of the contact lens has a less pronounced curvature than the upper edge thereof and can even have a less pronounced curvature than the side edges, specifically such that the curvature of the lower edge of the contact lens essentially corresponds to the curvature of the lower eyelid of the wearer. For the purposes of more accurate positioning of the contact lens, the thickness of the lens gradually increases from top to bottom.

REFERENCES:
patent: 3279878 (1966-10-01), Long
patent: 4268133 (1981-05-01), Fischer et al.
patent: 4618228 (1986-10-01), Baron
patent: 4618229 (1986-10-01), Jacobstein et al.
patent: 4813777 (1989-03-01), Rainville et al.
patent: 4854089 (1989-08-01), Morales
patent: 5502518 (1996-03-01), Lieberman

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