Multifocal diffractive ophthalmic lens and method of manufacture.
摘要
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. <IMAGE>
申请公布号
EP0435525(B1)
申请公布日期
1995.03.08
申请号
EP19900313632
申请日期
1990.12.14
申请人
NESTLE S.A.
发明人
ISAACSON, WILLIAM B., C/O MINNESOTA MINING AND;FUTHEY, JOHN A., C/O MINNESOTA MINING AND;THOMPSON KEN D., C/O MINNESOTA MINING AND;IHN, PAUL T., C/O MINNESOTA MINING AND