High strength ophthalmic lens

Details High strength ophthalmic lens High strength ophthalmic lens

C - Chemistry, Metallurgy

03

C

88/38, 49/92

C03C 21/00 (2006.01) C03C 3/076 (2006.01) C03C 3/095 (2006.01)

Patent

CA 1073678

HIGH STRENGTH OPHTHALMIC LENS Abstract of the Disclosure An ophthalmic glass lens having a compressively stressed surface zone after ion exchanging which is at least 60 micro- meters 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.

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