Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Eye prosthesis – Intraocular lens
Patent
1990-05-14
1993-01-12
Shay, Randy C.
Prosthesis (i.e., artificial body members), parts thereof, or ai
Eye prosthesis
Intraocular lens
351161, 359565, A61F 216
Patent
active
051786362
ABSTRACT:
Vision correcting lenses utilizing the principles of both Fresnel lenses and Fresnel zone plates are disclosed. The lenses of the present invention provide multifocal vision correction, and are most preferably used to provide intraocular lenses for small incision surgeries. Using the concept of a "tuned" Fresnel lens, intraocular and other types of vision correcting lenses are provided by the present invention which overcome the limitations found in typical Fresnel lenses by phase synchronizing the light passing through the lens. As disclosed, the groove width and depth of the lens may be varied to provide the synchronization, and also to provide multifocal vision. Also, the design of the present invention permits a relatively thin lens to be designed, therefore making it particularly applicable to small incision surgeries since it may be rolled or folded into a configuration which is easily inserted into an incision in the eye.
REFERENCES:
patent: 4210391 (1980-07-01), Cohen
patent: 4932970 (1990-06-01), Portnoy
patent: 4995714 (1991-02-01), Cohen
Iolab Corporation
Petrow Joel R.
Shay Randy C.
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