High strength ophthalmic lens

Details High strength ophthalmic lens High strength ophthalmic lens

1975-07-02

1976-12-14

McCarthy, Helen M.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

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

Patent

active

039972500

ABSTRACT:
An ophthalmic glass lens having a compressively stressed surface zone after ion exchanging which is at least 60 micrometers in depth can be formed from an alkali metal oxide silicate glass comprising by weight about 4 to about 15 percent sodium oxide, about 3 to about 15 percent potassium oxide provided the total amount of sodium, potassium and other alkali metal oxides is up to about 20 percent and about 3 to about 15 percent lanthanum oxide. The ion exchange process can take place at a temperature either above or below the strain point of conventional ophthalmic crown glass to produce satisfactory physical properties in the ophthalmic glass lens.

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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