Hardened circular spectacle-lens element and method of making th

Details Hardened circular spectacle-lens element and method of making th Hardened circular spectacle-lens element and method of making th

1977-12-01

1979-12-11

Clark, Conrad J.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

351166, 351177, 65 30E, 65115, 51284E, G02C 702, C03C 1500, B24B 100

Patent

active

041780825

ABSTRACT:
The invention contemplates a circular spectacle-lens blank which is optically finished on both its front and back surfaces and which is characterized by locally hardened registering central areas of both surfaces. The hardened areas are sized to be universally included within the spectacle-frame profile of all frames within a given variety of frames, and the outer annular areas are unhardened and of such effective radial extent as to embrace all of such profiles within said variety, so that each finished and hardened blank is adapted for later edging to the profile of a later selected one of the frames within the given variety. Various methods are described for creating the indicated locally hardened regions on the otherwise-finished lens blanks.

REFERENCES:
patent: 2762166 (1956-09-01), Vent
patent: 3251726 (1966-05-01), Acloque

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