MULTIFOCAL OPHTHALMIC LENS HAVING REDUCED GHOSTING

• US 20100188636A1
• Filed: 07/27/2009
• Published: 07/29/2010
• Est. Priority Date: 07/30/2008
• Status: Abandoned Application

• Current Assignee: Candido D. Pinto, David C. Compertore
• Original Assignee: Candido D. Pinto, David C. Compertore
• Inventors: Compertore, David C., Pinto, Candido D.
• Application Number:
  US12/509,789
• Publication Number:
  US 20100188636A1
• Time in Patent Office: Days
• US Class Current: 351/161
• CPC Class Codes: A61F 2/1613 having special lens configurations, e.g. multipart lenses; having particular optical properties, e.g. pseudo-accommodative lenses, lenses having aberration corrections, diffractive lenses, lenses for variably absorbing electromagnetic radiation, lenses having variable focus
• CPC Class Codes: A61F 2/1618 Multifocal lenses
• CPC Class Codes: G02C 7/028 Special mathematical design techniques
• CPC Class Codes: G02C 7/044 Annular configuration, e.g. pupil tuned

Abstract

An ophthalmic lens, comprising at least one optic including a first zone and a second zone having a second zone. The lens configured such that, when the lens is applied to an average eye, for objects located between infinity and a near focal plane of the average eye, an MTF of the eye'"'"'s optical system has no phase reversals.

Claims

1. An ophthalmic lens, comprising:

at least one optic including a first zone and a second zone having a second zone,

the lens configured such that, when the lens is applied to an average eye, for objects located between infinity and a near focal plane of the average eye, an MTF of the eye'"'"'s optical system has no phase reversals.

2. The lens of claim 1, wherein the lens is an intraocular lens.

3. The lens of claim 1, wherein the lens comprises an anterior surface and a posterior surface, and each of the anterior surface and the posterior surface have at least two zones.

4. The lens of claim 1, wherein the zones are concentric.

5. The lens of claim 1, wherein the lens has no phase reversal for objects having a spatial frequencies in a range 0-50 lp/mm.

6. The lens of claim 5, wherein the lens has no phase reversal for objects having a spatial frequencies in a range 0-75 lp/mm.

7. The lens of claim 6, wherein the lens has no phase reversal for objects having a spatial frequencies in a range 0-100 lp/mm.

8. The lens of claim 1, wherein the near focal plane is located 1 meter or closer to the front of the average eye.

9. The lens of claim 8, wherein a far focal plane of the lens is adapted to provide the average eye with vision at an infinite distance from the eye.

10. The lens of claim 1, wherein the near focal plane is located 65 centimeters or closer to the front of the eye.

11. The lens of claim 10, wherein a far focal plane of the lens is adapted to provide the average eye with vision at an infinite distance from the eye.

12. The lens of claim 1, where in the lens comprises a third zone.

13. The lens of claim 12, wherein each of the three zones has a different focal length.

14. The lens of claim 13, wherein the MTF has no phase reversals in a range between a focus of the first zone and a focus of the second zone.

15. The lens of claim 14, where the MTF has a phase reversal between a focus of the third zone and the range.

16. The lens of claim 15, wherein the lens is a single element lens.

17. A method of designing a multizonal lens using a model eye including the lens, comprising:

optimizing the lens such that second derivatives of a wavefront at an exit pupil of the model eye optical system are substantially zero.

18. The method of claim 17, wherein lens comprises a first zone having a first focal length and a second zone having a second wavelength.

19. The method of claim 18 wherein, when the lens is applied to an average eye, the first focal length provides a first focal plane located 1 meter or closer to the front of an the eye and the second focal length provides a second focal plane at infinity.

20. The method of claim 17, wherein the step of optimizing comprises using even aspheric terms of at least one of an anterior surface and a posterior surface of the lens as variables.

21. The method of claim 17, further comprising a step of designing a first zone for vision at a near focal plane, and a step of designing a second zone for vision at a far focal plane, both step being performed prior to the step of optimizing the lens.