System incorporation two different sphero-non-spherical contact lenses for correcting presbytia
Patent 5574518 Issued on November 12, 1996. Estimated Expiration Date: 
January 10, 2015. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
January 10, 2015. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesOphthalmic lens for presbyopia and aphakia Presbyopic contact lens Presbyopic contact lens Multifocal corneal contact lenses Multifocal ophthalmic lens Progressive eccentricity multifocal contact lens and manufacturing process thereof Patent #: 5214453 InventorAssigneeApplicationNo. 370666 filed on 01/10/1995US Classes:351/161MultifocalExaminersPrimary: Epps, GeorgiaAssistant: Schwartz, Jordan M. Attorney, Agent or FirmForeign Patent References
International ClassG02C 007/04AbstractThe first contact lens is placed on the dominating eye and includes a central spherical area for distance vision, which is surrounded by an annular non-spherical area having a diopter in the form of progressive addition which varies from zero addition at the inner periphery to a maximum addition at the outer periphery, and which enables vision, at all distances including reading. The second contact lens is placed on the dominated eye. The central area is spherical and adjusted for reading. The non-spherical annular area has a progressive reduction from maximum addition to zero addition, which enables vision from reading to intermediate and distance vision. This system provides in most cases 95-100% vision at all distances.Other References
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