Multiple element zone of focus artificial lens

• US 4,778,462 A
• Filed: 08/24/1987
• Issued: 10/18/1988
• 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:
  US07/088,412
• Time in Patent Office: 421 Days
• Field of Search: 623/6, 351/161, 351/162, 351/168, 351/171
• US Class Current: 623/6.27
• CPC Class Codes: A61F 2/1618 Multifocal lenses
• CPC Class Codes: A61F 2/1648 Multipart lenses

Abstract

An implantable or contact lens for replacement of a defective natural lens in an eye in which various portions of the lens have different powers and focal lengths 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 zone of focus lens for use with an eye comprising:

a. a plurality of lens elements joined to form a unitary lens structure having a front surface, a rear surface and a circular periphery;

b. each of said lens elements serving to create an image on a distinct portion of the retina;

c. at least two of said lens elements having different powers whereby objects at different distances from the eye are simultaneously brought to a focus on distinct portions of the retina; and

,

d. at least two of said lens elements are different colors.

2. A lens according to claim 1 wherein said lens elements are round.

3. A lens according to claim 2 wherein at least two of said lens elements are of materials having different indices of refraction.

4. A lens according to claim 1 comprised of lens elements each having different indices of refraction.

5. A lens according to claim 4 consisting of three lens elements.

6. A lens according to claim 5 having a horizontally oriented lens element larger than said other lens elements.

7. A lens according to claim 5 having a vertically oriented lens element larger than said other lens elements.

8. A lens according to claim 5 wherein said lens elements are horizontally oriented.

9. A lens according to claim 5 wherein said lens elements are vertically oriented.

10. A lens according to claim 3 wherein the junctions between lens elements includes an anti-reflective coating.

11. First and second lenses according to claim 1 for use in left and right eyes wherein like power elements are similarly positioned.