Ion exchangeable segment glass

Details Ion exchangeable segment glass Ion exchangeable segment glass

1975-10-28

1976-12-14

McCarthy, Helen M.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

65 30E, 351168, 351171, 106 52, 106 47Q, 428410, G02B 528

Patent

active

039972496

ABSTRACT:
There is disclosed an ion exchange-strengthened ophthalmic segment glass suitable for the fabrication of fused bifocal and trifocal ophthalmic lenses. More particularly, there is disclosed a lanthanum-silicate based ophthalmic segment glass having indices of refraction of about 1.57 to about 1.65 which is suitable for chemical ion exchange strengthening so as to develop a compressively-stressed ion-exchanged surface layer having a depth of at least 60 micrometers.

REFERENCES:
patent: 3533888 (1970-10-01), Eppler et al.
patent: 3790260 (1974-02-01), Boyd et al.
patent: 3898093 (1975-08-01), Faulstich et al.
patent: 3899315 (1975-08-01), Siegmund
patent: 3923486 (1975-12-01), Kitano et al.

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