Ophthalmic lens

• US 6,830,332 B2
• Filed: 04/10/2002
• Issued: 12/14/2004
• Est. Priority Date: 04/11/2001
• Status: Expired due to Term

• Current Assignee: Amo Groningen B.V (Johnson & Johnson)
• Original Assignee: Advanced Medical Optics Incorporated (Johnson & Johnson)
• Inventors: Weeber, Hendrik Albert, Piers, Patricia Ann
• Primary Examiner(s): Sugarman, Scott J.
• Application Number:
  US10/119,661
• Publication Number:
  US 20030063254A1
• Time in Patent Office: 979 Days
• Field of Search: 623/6.31, 351/159, 351/160.R, 351/160.H, 351/161, 351/162, 351/177, 359/558
• US Class Current: 351/159
• CPC Class Codes: A61F 2/164 Aspheric lenses
• CPC Class Codes: A61F 2/1654 Diffractive lenses
• CPC Class Codes: G02B 5/1895 such optical elements having dioptric power
• CPC Class Codes: G02C 2202/06 Special ophthalmologic or optometric aspects
• CPC Class Codes: G02C 2202/20 Diffractive and Fresnel lenses or lens portions
• CPC Class Codes: G02C 2202/22 Correction of higher order and chromatic aberrations, wave front measurement and calculation
• CPC Class Codes: G02C 7/028 Special mathematical design techniques
• CPC Class Codes: G02C 7/041 bifocal; multifocal

Abstract

According to the invention the ophthalmic lens further comprises a refractive part comprising at least one surface, which is configured to compensate a passing wavefront at least partly for at least one type of monochromatic aberration introduced by at least one of the optical parts of the eye. Said diffractive part is capable of compensating a passing wavefront at least partly for chromatic aberration introduced by at least one of the optical parts of the eye. Furthermore said refractive and diffractive parts together contribute to a required power of the lens.

Claims

1. An ophthalmic lens comprising a diffractive part comprising a diffractive surface profile and a refractive part comprising at least one surface, which is configured to compensate a passing wavefront at least partly for at least one type of monochromatic aberration introduced by at least one optical part of the eye, said diffractive part being capable of compensating a passing wavefront at least partly for chromatic aberration introduced by at least one optical part of the eye, said refractive and diffractive parts being adapted together to contribute to a required power of the lens.

2. An ophthalmic lens according to claim 1, wherein the diffractive part is capable of compensating a passing wavefront at least partly for chromatic aberration introduced by the refractive part of the lens.

3. An ophthalmic lens according to claim 1, wherein the refractive part is capable of compensating a passing wavefront at least partly for at least one type of monochromatic aberration introduced by the diffractive part of the lens.

4. An ophthalmic lens according to claim 1, wherein said lens is adapted to compensate at least partly for values of monochromatic and chromatic aberrations measured in the eye of an individual patient.

5. An ophthalmic lens according to claim 1, wherein said lens is adapted to compensate at least partly for an average value of monochromatic and/or chromatic aberration determined by measurements of a group of people.

6. An ophthalmic lens according to claim 1, wherein said refractive part comprises at least one surface, which is configured to compensate a passing wavefront at least partly for spherical aberration introduced by at least one optical part of the eye and optionally also by the diffractive part of the lens.

7. An ophthalmic lens according to claim 1, wherein the refractive part comprises an aspheric surface, which compensates a passing wavefront at least partly for the spherical aberration introduced by at least one optical part of the eye and optionally also by the diffractive part of the lens.

8. An ophthalmic lens according to claim 1, wherein said aspheric surface is capable of compensating at least partly for spherical aberration as expressed by the 11th normalized Zernike term.

9. An ophthalmic lens according to claim 1, wherein the diffractive surface profile consists of a number of concentric rings.

10. An ophthalmic lens according to claim 9, wherein the profile height of the diffractive surface profile equals an integer number of the design wavelength.

11. An ophthalmic lens according to claim 9, wherein the profile height of the diffractive surface profile is one design wavelength.

12. An ophthalmic lens according to claim 1, wherein the lens comprises an anterior surface, and the anterior surface is an aspheric surface, on which a diffractive profile is superimposed.

13. An ophthalmic lens according to claim 9, wherein the profile height of the diffractive surface profile is two design wavelengths.

14. An ophthalmic lens according to claim 1, wherein the lens comprises an anterior surface and a posterior surface, the anterior surface of the lens is an aspheric surface and the posterior surface of the lens is flat and has a diffractive profile.

15. An ophthalmic lens according to claim 1, wherein the shape of the lens is equi-biconvex.

16. An ophthalmic lens according to claim 1, wherein the shape of the lens is convex-plano.

17. An ophthalmic lens according to claim 1, wherein the lens material is a silicone.

18. An ophthalmic lens according to claim 1, wherein the lens material is PMMA or a hydrogel.

19. A method for designing an ophthalmic lens according to claim 1, comprising:

combining a refractive part and a diffractive part of the lens such that they are adapted to together compensate a passing wavefront at least partly for at least one type of monochromatic aberration and for chromatic aberration introduced by at least one optical part of the eye, while dimensioning said refractive and diffractive parts to provide the lens with a required power.

20. A method according to claim 19, further comprising the steps of:

measuring at least one type of monochromatic aberration provided to a wavefront from at least one optical part of an eye; and

combining the refractive and diffractive parts of the lens such that they are adapted to compensate at least partly for the measured monochromatic aberration.

21. A method for designing an ophthalmic lens according to claim 19, further comprising the steps of:

measuring the spherical aberration provided to a wavefront from at least one optical part of an eye; and

combining the refractive part and the diffractive part of the lens such that they are adapted to together compensate a passing wavefront at least partly for the measured spherical aberration introduced by at least one optical part of the eye.

22. A method according to claim 19, comprising measuring the chromatic aberration provided to a wavefront from at least one optical part of the eye and combining the refractive and diffractive parts of the lens such that they are adapted together to compensate a passing wavefront at least partly for the measured chromatic aberration introduced by at least one optical part of the eye.

23. A method according to claim 19, comprising combining the refractive and diffractive parts of the lens such that they together are adapted to compensate a passing wavefront at least partly for an average chromatic aberration of human eyes in general or of eyes in a specific group of people.

24. A method according to claim 19, comprising combining the refractive and the diffractive parts of the lens such that they together are adapted to compensate a passing wavefront at least partly for an average monochromatic aberration of eyes in general or of eyes in a specific group of people.

25. A method according to claim 19, comprising combining the refractive and diffractive parts of the lens such that the diffractive part is adapted to compensate a passing wavefront at least partly for the chromatic aberration introduced by the refractive part of the lens.

26. A method according to claim 19, comprising combining the refractive and the diffractive parts of the lens such that the refractive part is adapted to compensate a passing wavefront at least partly for the monochromatic aberration introduced by the diffractive part of the lens.

27. A method according to claim 19, comprising measuring the refractive error of the eye and dimensioning the refractive and diffractive parts of the lens such that they together are adapted to compensate at least partly for the refractive error of the eye.

28. A method according to claim 19, comprising providing the refractive part with an aspheric surface, which is adapted to compensate a passing wavefront at least partly for the spherical aberration introduced by at least one optical part of the eye and optionally also by the diffractive part of the lens.

29. A method according to claim 19, comprising providing the refractive part with an aspheric surface, which is adapted to compensate at least partly for spherical aberration as expressed by the 11th normalized Zernike term.

30. A method according to claim 19, comprising providing the lens with a diffractive surface profile.

31. A method according to claim 30, comprising providing the diffractive surface profile with a number of concentric rings.

32. A method according to claim 31, comprising providing the diffractive surface profile with a profile height that equals an integer number of the design wavelength.

33. A method according to claim 19, comprising providing an anterior surface of the lens with an aspheric refractive lens and superimposing a diffractive profile on the aspheric refractive lens.

34. An ophthalmic lens according to claim 11, wherein the lens comprises an anterior surface, and the anterior surface is an aspheric surface, on which a diffractive profile is superimposed.

35. An ophthalmic lens according to claim 13, wherein the lens comprises an anterior surface and a posterior surface, the anterior surface of the lens is an aspheric surface and the posterior surface of the lens is flat and has a diffractive profile.

39. A method of designing an ophthalmic lens according to claim 1, comprising the steps of:

i) selecting an eye model with a refractive aspheric ophthalmic lens of a predetermined refractive power and a predetermined amount of at least one monochromatic aberration;

ii) estimating the power of said eye model at different wavelengths, so as to determine the chromatic aberration of the eye model;

iii) estimating a correction function of how the power varies with the wavelength to be an ideal compensation for said chromatic aberration of the eye model;

iv) finding a linear function of how power varies with the wavelength, which suitably approximates said correction function;

v) calculating a provisional zone width of a diffractive profile corresponding to the linear function and calculating the diffractive power of the diffractive profile;

vi) reducing the refractive power of the refractive ophthalmic lens by the amount of power calculated for the diffractive profile;

vii) estimating a new correction function of step iii), finding a new linear function of step iv) and calculating a new provisional zone width and a new diffractive power for a new diffractive profile corresponding to the new linear function;

viii) adjusting the refractive power of the refractive ophthalmic lens such that the total power of a hybrid lens, which comprises both the refractive ophthalmic lens and the diffractive profile and which is adapted to replace the refractive ophthalmic lens in the eye model, equals the predetermined power; and

ix) repeating steps vii) to viii) until a suitable combination of a refractive part and a diffractive part of the hybrid ophthalmic lens is found that is adapted to provide the eye model with a predetermined power and with a suitable reduction in chromatic aberration.

40. A method according to claim 39, further comprising as a last step measuring the monochromatic aberration of the combination of the eye and the resulting hybrid ophthalmic lens and correcting the refractive part of the ophthalmic lens according to the measurements such that the monochromatic aberration is reduced sufficiently for the combination of eye and ophthalmic lens.

41. A method according to claim 39, wherein the at least one monochromatic aberration of the refractive ophthalmic lens is spherical aberration.

42. A method according to claim 39, wherein the eye model used is the eye model of Navarro (1985).

43. A method according to claim 39, wherein the profile height of the diffractive profile equals an integer number of the design wavelength.

36. An ophthalmic lens comprising a diffractive part and a refractive part comprising at least one surface, which is configured to compensate a passing wavefront at least partly for at least one type of monochromatic aberration introduced by at least one optical part of the eye, said diffractive part being capable of compensating a passing wavefront at least partly for chromatic aberration introduced by at least one optical part of the eye, said refractive and diffractive parts being adapted together to contribute to a required power of the lens, wherein the refractive part comprises an aspheric surface, which compensates a passing wavefront at least partly for the spherical aberration introduced by at least one optical part of the eye and optionally also by the diffractive part of the lens, and wherein the lens together with the eye provides a polychromatic image quality, which when expressed as MTF(50) (Modulation Transfer Function at 50 cycles per millimeter) is adapted to perform at least about 40% higher than an aspheric lens compensating for the same spherical aberration but without compensating for the chromatic aberration.

37. An ophthalmic lens comprising a diffractive part and a refractive part comprising at least one surface, which is configured to compensate a passing wavefront at least partly for at least one type of monochromatic aberration introduced by at least one optical part of the eye, said diffractive part being capable of compensating a passing wavefront at least partly for chromatic aberration introduced by at least one optical part of the eye, said refractive and diffractive parts being adapted together to contribute to a required power of the lens, wherein the lens comprises an anterior surface, and the anterior surface is an aspheric surface, on which a diffractive profile is superimposed, wherein the diffractive surface profile consists of a number of concentric rings, wherein the profile height of the diffractive surface profile is one design wavelength, and wherein the radial width of a first zone of the diffractive profile is 0.365 mm for a 20D lens.

38. An ophthalmic lens comprising a diffractive part and a refractive part comprising at least one surface, which is configured to compensate a passing wavefront at least partly for at least one type of monochromatic aberration introduced by at least one optical part of the eye, said diffractive part being capable of compensating a passing wavefront at least partly for chromatic aberration introduced by at least one optical part of the eye, said refractive and diffractive parts being adapted together to contribute to a required power of the lens, wherein the lens comprises an anterior surface and a posterior surface, the anterior surface of the lens is an aspheric surface and the posterior surface of the lens is flat and has a diffractive profile, wherein the diffractive part is a diffractive surface profile consisting of a number of concentric rings, and wherein the radial width of a first zone of the diffractive profile is 0.516 mm for a 20D lens.