Lens blank

Details Lens blank Lens blank

1990-08-06

1992-07-21

Sugarman, Scott J.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

G02C 702

Patent

active

051317389

ABSTRACT:
The present invention provides an aspherical spectacle lens blank for a normal, non-aphakic eyeglass wearer. The lens blank is generally circular in shape and includes a central circular zone which is surrounded by four or more concentric outer zones. For the plus power lens, the outer zones are decreased in diopter refraction from the central zone to the outer peripheral zone. The lens blank of the present invention is lighter and thinner than the previously known spectacle lens blanks.

REFERENCES:
patent: 3960442 (1976-06-01), Davis et al.
patent: 4289387 (1981-09-01), Jalie

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