Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Patent Inventor Names
Xiaoxiao Zhang0
Xin Hong0
Steve VanNoy0
Date of Patent
October 28, 2008
Patent Application Number
11350497
Date Filed
February 9, 2006
Patent Citations Received
Patent Primary Examiner
Patent abstract
In one aspect of the invention, a trifocal ophthalmic lens is disclosed that includes an optic having at least one optical surface, and a plurality of diffractive zones that are disposed on a portion of that surface about an optical axis of the optic. At least two of those diffractive zones have different areas so as to cause broadening of optical energy profiles at a near and a far foci of the diffractive zones for generating an intermediate focus.
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