Photochromic multifocal lenses

Details Photochromic multifocal lenses Photochromic multifocal lenses

1974-12-23

1976-08-17

Rubin, David H.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

351165, G02C 710, G02C 706

Patent

active

039750930

ABSTRACT:
A high index of refraction, low softening point, low expansion segment glass is fused into a countersunk photochromic glass blank of lower index of refraction. The high index of refraction segment is primarily composed of SiO.sub.2, B.sub.2 O.sub.3, and PbO with lesser amounts of other oxides.

REFERENCES:
patent: 2280322 (1942-04-01), Tillyer
patent: 3020803 (1962-02-01), Duncan et al.
patent: 3208860 (1965-09-01), Armistead et al.
patent: 3325299 (1967-06-01), Araujo
patent: 3703388 (1972-11-01), Araujo et al.
patent: 3703660 (1972-11-01), Fyler

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