Multifocal diffractive ophthalmic lens and method of...

Details Multifocal diffractive ophthalmic lens and method of... Multifocal diffractive ophthalmic lens and method of...

G - Physics

02

C

18/104, 88/42

G02C 7/06 (2006.01) A61F 2/16 (2006.01) B29C 65/08 (2006.01) B29D 11/00 (2006.01) G02B 5/18 (2006.01)

Patent

CA 2030591

MULTIFOCAL DIFFRACTIVE OPHTHALMIC LENS AND METHOD OF MANUFACTURE ABSTRACT OF THE DISCLOSURE A multifocal ophthalmic lens includes first and second lens members. Each lens member has a smooth outer surface and an inner surface with an edge about its perimeter. A multifocal diffractive zone plate on at least one of the lens members is characterized by an index of refraction. The lens members are joined at the edges by ultrasonic welding to form a cavity adjacent the diffractive zone plate. The cavity is filled with a liquid medication having an index of refraction which is different than the index of refraction of the diffractive zone plate. A hole through one of the lens members functions as a fluid transport mechanism to permit transfer of the medication between the cavity and eye.

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