Ophthalmic glass/plastic laminated lens

Details Ophthalmic glass/plastic laminated lens Ophthalmic glass/plastic laminated lens

G - Physics

02

C

88/99

G02C 7/02 (2006.01) G02C 7/10 (2006.01) G02C 7/12 (2006.01)

Patent

CA 1254069

ABSTRACT OF THE DISCLOSURE A composite glass/plastic ophthalmic lens is disclosed. The lens consists of a thin layer of glass, preferably photochromic, adhered to the front of a plastic layer by a highly elastic adhesive. The rear surface of the glass has a different radius than the front surface of the plastic so that the space between the lenses forms a tapered gap which is filled by the elastic adhesive. The edge thickness of the elastic adhesive is sufficient to insure that the increase in diameter of the plastic layer with respect to the diameter of the glass layer due to differences in the thermal expansion characteristic of the glass and the plastic will not damage the composite lens even over a temperature range greater than 300°F. The glass layer is shaped to have a power which compensates for differences in the index of refraction of the glass, adhesive and plastic layer, and which compensates for the optical powers produced by the tapered adhesive layer, so that the composite lens can be finished to prescription as though it were an all-plastic lens.

493448

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