Multifocal ophthalmic lens

• US 8,906,089 B2
• Filed: 08/30/2013
• Issued: 12/09/2014
• Est. Priority Date: 11/29/2002
• Status: Active Grant

• Current Assignee: Amo Groningen B.V (Johnson & Johnson)
• Original Assignee: Amo Groningen B.V (Johnson & Johnson)
• Inventors: Piers, Patricia Ann, Norrby, Sverker, Weeber, Hendrick A.
• Primary Examiner(s): MATTHEWS, WILLIAM H
• Application Number:
  US14/014,676
• Publication Number:
  US 20130345806A1
• Time in Patent Office: 466 Days
• Field of Search: 623/6.23, 623/6.24, 623 627- 631
• US Class Current: 623/6.3
• CPC Class Codes: A61B 3/0025 characterised by electronic signal processing, e.g. eye models
• 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 2/1616 Pseudo-accommodative, e.g. multifocal or enabling monovision
• CPC Class Codes: A61F 2/1618 Multifocal lenses
• CPC Class Codes: A61F 2/1637 Correcting aberrations caused by inhomogeneities; correcting intrinsic aberrations, e.g. of the cornea, of the surface of the natural lens, aspheric, cylindrical, toric lenses
• CPC Class Codes: A61F 2/164 Aspheric lenses
• CPC Class Codes: A61F 2/1654 Diffractive lenses
• CPC Class Codes: A61F 2002/1681 having supporting structure for lens, e.g. haptics
• CPC Class Codes: A61F 2002/1696 Having structure for blocking or reducing amount of light transmitted, e.g. glare reduction
• CPC Class Codes: A61F 2240/001 Designing or manufacturing processes
• CPC Class Codes: A61F 2240/002 Designing or making customized prostheses
• CPC Class Codes: G01J 9/00 Measuring optical phase difference devices or arrangements for controlling the phase of light beams G02F1/01; Determining degree of coherence; Measuring optical wavelength spectrometry G01J3/00
• 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
• CPC Class Codes: G02C 7/042 Simultaneous type
• CPC Class Codes: G02C 7/044 Annular configuration, e.g. pupil tuned
• CPC Class Codes: G02C 7/06 bifocal; multifocal ; progressive G02C7/041 takes precedence

Abstract

A method of designing a multifocal ophthalmic lens with one base focus and at least one additional focus, capable of reducing aberrations of the eye for at least one of the foci after its implantation, comprising the steps of: (i) characterizing at least one corneal surface as a mathematical model; (ii) calculating the resulting aberrations of said corneal surface(s) by employing said mathematical model; (iii) modelling the multifocal ophthalmic lens such that a wavefront arriving from an optical system comprising said lens and said at least one corneal surface obtains reduced aberrations for at least one of the foci. There is also disclosed a method of selecting a multifocal intraocular lens, a method of designing a multifocal ophthalmic lens based on corneal data from a group of patients, and a multifocal ophthalmic lens.

Claims

1. A diffractive, multifocal intraocular lens for treatment of an eye of a patient comprising:

a diffractive pattern and at least one non-spherical surface;

the lens having one base focus comprising a far-field focus and at least one additional focus comprising at least one of a near-field focus and a mid-field focus;

wherein the lens is configured to reduce, when implanted in the patient'"'"'s eye, a chromatic aberration of the eye for the at least one additional focus; and

wherein the at least one non-spherical surface is configured to alter, for at least one of the foci, a shape of a light wavefront passing through the lens;

the alteration to the wavefront being characterized by a change of at least one spherical wavefront aberration term of a polynomial expression describing the wavefront;

in which the change in the at least one spherical wavefront aberration term offsets, at least partly, a mean value of that spherical wavefront aberration term based on corneal measurements of a selected group of people.

2. The diffractive, multifocal intraocular lens of claim 1, wherein the at least one non-spherical surface is configured to alter the shape of the light wavefront passing through the lens to offset, at least partly, a mean value of that spherical aberration term for a group of people having cataracts.

3. The diffractive, multifocal intraocular lens of claim 1, wherein the at least one non-spherical surface is configured to alter the shape of the light wavefront passing through the lens to partially offset the mean value of that spherical wavefront aberration term for the selected group of people.

4. The diffractive, multifocal intraocular lens of claim 1, wherein the lens is a bifocal lens that is configured, when implanted in the patient'"'"'s eye, to vary a light distribution between the base and additional focus of the lens as a pupil diameter of the patient'"'"'s eye varies.

5. The diffractive, multifocal intraocular lens of claim 4, wherein the diffractive pattern has a gradually reduced step height in a direction towards a periphery of the lens.

6. The diffractive, multifocal intraocular lens of claim 1, wherein the lens includes a surface opposite to the at least one non-spherical surface that is configured to offset an additional wavefront aberration term associated with the light wavefront passing through the lens.

7. The diffractive, multifocal intraocular lens of claim 6, wherein the additional wavefront aberration term relates to astigmatism.

8. The diffractive, multifocal intraocular lens of claim 1, wherein the at least one non-spherical surface is a modified conoid surface having a conical constant less than zero.