G - Physics – 02 – C
Patent
G - Physics
02
C
88/112
G02C 7/06 (2006.01) G02C 7/08 (2006.01) G02C 7/10 (2006.01)
Patent
CA 1264245
Abstract of the Disclosure Disclosed is an eyeglass lens module in which two lens components are formed. The first component is the conventional single vision stock lens having conventional corrections in the negative or positive diopter range and, indeed, for the patient requiring only bifocals or trifocals, the single vision stock lens can be of zero correction. The second veneer over-lay lens component is desirably formed of a plastic or glass material and is as thin as practical so that it becomes a veneer cover. These veneer over-lays are in modules containing bifocals or trifocals or vocational modifications of a given diopter correction. They can also contain special vocational features such as upper bifocals for airline pilots. Once the prescription is developed according to the method of the invention, the optical glass lens blank is then fixtured for receiving the veneer over-lay. Prior to the laminating or gluing procedure, a sagittal gauge is applied to the posterior surface of the veneer over-lay and the anterior surface of the single vision stock lens, to determine that their curvatures are nearly equal to insure a close physical inter-fit which, in turn, will help insure an optically acceptable bond between the two. Desirably, the lens and the veneer over-lay are cut and edged to the configurations of the frame which is selected. Optionally they can be cut and edged before or after laminating. Once the two lens components are secured to each other with an optical cement which is applied with a rotary motion to minimize bubbles or other optical distortions in the cementing action, they can then be fitted into the spectacle frame and delivered to the patient. Furthermore, when tinting is required the plastic veneer over-lay can be readily tinted by conventional dye as distinguished from the expensive and time consuming coating process required with the optical glass type lens.
511486
Derojas Edward
Frieder Philip M.
Green Weldon F.
Optical Systems International Inc.
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