Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – With vertical adjustment of multifocal lenses
Patent
1996-05-13
1998-08-04
Dang, Hung X.
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
With vertical adjustment of multifocal lenses
351 54, G02B 706
Patent
active
057902275
ABSTRACT:
Multi-focal prescription composite lenses having at least two corrections are made by adhering a first-part lens having a predetermined positive or negative diopter correction realized by a cylinder correction prescription on a rear surface and a preselected front surface, to a second-part lens having a predetermined prescription correction at a portion of a front surface and a preselected rear surface that is complimentary to the front surface of the first lens. A lens attachment feature, normally a tab, is integral with at least one of the first- and second-part lens, and persists in the multi-focal prescription composite lens. An eyeglass frame has and presents a complimentary feature, normally a channel within a front piece to the frame, that engages and holds the multi-focal prescription lens to the frame at an adjustable pupillary distance. Two composite lenses are assembled, and permanently mounted in and to the frame, totally without power tools. The second-part lens of each composite lens may optionally be tinted, treated, or, in particular, polaroid. Lens surrounds help disguise the substantial round appearance of the composite lenses in the hand-assembled multi-focal prescription eyeglasses.
REFERENCES:
patent: 3958867 (1976-05-01), Morgan
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