Lens wafer, laminate lens and method of fabrication thereof

Details Lens wafer, laminate lens and method of fabrication thereof Lens wafer, laminate lens and method of fabrication thereof

1990-11-02

1992-09-22

Sugarman, Scott J.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

351172, 351177, G02C 702, G02C 706

Patent

active

051491818

ABSTRACT:
Lens wafers which are bonded together with adhesive to form a laminate lens for use in eyeglasses or for other purposes enables immediate visual detection of the installation of an unlaminated lens wafer in the eyeglasses or the like. At least a portion of the safeguarded wafer has a visually observable region which impairs use of the wafer in the absence of the adhesive and another wafer. The impairment becomes invisible during the process of bonding the wafer to another wafer. The visually observable impairment may have an outline which conveys information such as optical parameters of the wafer or the angular position of the wafer relative to the other wafer at the start of the bonding process.

REFERENCES:
patent: 3877798 (1974-04-01), Tolar
patent: 4645317 (1987-02-01), Freider et al.
patent: 4892403 (1990-01-01), Merle
patent: 4969729 (1990-11-01), Merle

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