Laminated zone of focus artificial lens

• US 4,798,608 A
• Filed: 08/24/1987
• Issued: 01/17/1989
• Est. Priority Date: 08/24/1987
• Status: Expired due to Fees

• Current Assignee: Dennis T. Grendahl
• Original Assignee: Dennis T. Grendahl
• Inventors: Grendahl, Dennis T.
• Primary Examiner(s): Apley, Richard J.
• Assistant Examiner(s): Prizant, James
• Application Number:
  US07/088,428
• Time in Patent Office: 512 Days
• Field of Search: 623/6, 351/168, 351/171, 351/161, 351/162
• US Class Current: 623/6.28
• CPC Class Codes: A61F 2/1618 Multifocal lenses
• CPC Class Codes: A61F 2240/001 Designing or manufacturing processes
• CPC Class Codes: A61F 2250/0098 radio-opaque, e.g. radio-opaque markers

Abstract

An implantable or contact lens for replacement of a defective natural lens in an eye in which various portions of the lens are laminated horizontally to have different powers to produce in-focus images on different portions of the retina of objects which are located at various distances from the eye, thereby substituting for the natural focusing action of the eye. The image processing capability of the brain functions to largely ignore the out-of-focus images and concentrate on the in-focus image of the object selected by the brain for consideration.

Claims

1. A laminated zone of focus lens for use with an eye comprising:

a. two or more optical lamination elements including a first lamination element encompassing a first area of said lens;

b. a second lamination element encompassing a second area of said lens;

c. said first lamination element, in combination with said second lamination element serving to create an image of a first distinct portion of the retina;

d. said second lamination element serving to simultaneously create an image on a second distinct portion of the retina which is different from said first portion; and

,

(e) at least two of said lamination elements being of different colors.

2. A lens according to claim 1 where in said first and second lamination elements have differing indices of refraction.

3. A lens according to claim 1 wherein said first lamination element has a surface curvature differing from the surface curvature of said second lamination element.

4. A lens according to claim 1 wherein said first lamination element has a diameter less than said second lamination element.

5. A lens according to claim 4 wherein the surface area of said lens in the region of the periphery of the lamination element having the smaller diameter is coated with an opaque material to reduce reflected and refracted rays from this region.

6. A lens according to claim 1 wherein said lamination elements are joined with a transparent adhesive material.

7. A lens according to claim 1 further including a coating over at least one of the surfaces of said lens to provide a smooth surface.

8. A lens according to claim 7 wherein both surfaces of said lens are so coated.