Multifocal ophthalmic lens and related methods

Patent metadata

Field	Value
Publication number	US-12228805-B2
Application number	US-202318227328-A
Country	US
Kind code	B2
Filing date	Jul 28, 2023
Priority date	Apr 30, 2020
Publication date	Feb 18, 2025
Grant date	Feb 18, 2025

Abstract

A multifocal ophthalmic lens has a surface that varies across at least a portion of the lens to form a surface power map. The surface power map comprises a spiral, with a power that varies substantially periodically both radially outwards from and angularly about an optical axis of the lens. A period of the radial variation is greater than 100 microns and a period of the angular variation is greater than 6 degrees. Methods of making and using the multifocal ophthalmic lens are also described.

First claim

The invention claimed is:

1. A multifocal ophthalmic lens wherein:
a first surface of the lens varies across at least a portion of the lens to form a first surface power map;
the first surface power map comprises a spiral, with a power that varies substantially periodically both radially outwards from and angularly about an optical axis of the lens, wherein the radial variation has a period that is substantially constant across the portion and that is greater than 100 microns.

2. The multifocal ophthalmic lens according to claim 1 , wherein a period of the angular variation is greater than 6 degrees.

3. The multifocal ophthalmic lens according to claim 1 , wherein:
the ophthalmic lens is a contact lens; and
the first surface varies across an optic zone of the contact lens to form the first surface power map.

4. The multifocal ophthalmic lens according to claim 1 , wherein the power varies smoothly across the portion.

5. The multifocal ophthalmic lens according to claim 4 , wherein the power varies both radially and angularly as one of: a rounded square wave and a sinusoid.

6. The multifocal ophthalmic lens according to claim 1 , wherein the power varies both radially and angularly as a square wave.

7. The multifocal ophthalmic lens according to claim 1 , wherein the period of the angular variation is substantially constant across the portion.

8. The multifocal ophthalmic lens according to claim 1 , wherein the period of the angular variation changes according to one or both of: a radial distance from the optical axis of the lens and an angular position about the optical axis of the lens.

9. The multifocal ophthalmic lens according to claim 1 , wherein:
the lens comprises an optic zone, the optic zone comprising a central region and an outer region, the central region immediately surrounding the optical axis of the lens and the outer region surrounding the central region;
the power of the central region does not vary periodically across the central region; and
the outer region comprises the angular and radial variations in power.

10. The multifocal ophthalmic lens according to claim 9 , wherein the central region has a diameter of less than 50% of that of the portion.

11. The multifocal ophthalmic lens according to claim 9 , wherein the central region has a diameter of 25% or less than that of the optic zone.

12. The multifocal ophthalmic lens according to claim 9 , wherein:
the lens comprises a transition region, the transition region surrounding the central region and the outer region surrounding the transition region; and
the power of the transition region varies to provide a smooth transition between the central and outer regions.

13. The multifocal ophthalmic lens according to claim 1 , wherein:
the lens comprises a second surface which varies across the portion of the lens to form a second surface power map;
the second surface power map comprises a spiral, with a power that varies substantially periodically radially outwards from and angularly about the optical axis of the lens, and wherein the radial variation has a period that is substantially constant across the portion and that is greater than 100 microns.

14. The multifocal ophthalmic lens according to claim 13 , wherein:
the first surface power map and the second surface power map each comprise a spiral; and
the spirals provided by the first and second surface power maps twist in opposing directions.

15. The multifocal ophthalmic lens according to claim 13 , wherein the multifocal ophthalmic lens is a myopia control lens.

16. A method of manufacturing a multifocal ophthalmic lens, the method comprising:
operating a lathe to shape a first surface of at least one of: a lens, a mold for a lens, or an insert for manufacturing a mold for a lens, such that:
the first surface varies across at least a portion of the lens to form a first surface power map;
the first surface power map comprises a spiral;
the first surface power map varies substantially periodically both radially outwards from and angularly about an optical axis of the lens, and wherein the radial variation has a period that is substantially constant across the portion and that is greater than 100 microns.

17. The method according to claim 16 , further comprising operating a lathe to shape a second surface of the lens, the mold, or the insert, such that:
the second surface varies across the portion of the lens to form a second surface power map;
the second surface power map comprises a spiral;
the second surface power map varies substantially periodically both radially outwards from and angularly about an optical axis of the lens, and wherein the radial variation has a period that is substantially constant across the portion and that is greater than 100 microns.

18. A method of improving vision of a person, the method comprising:
providing a multifocal ophthalmic lens to a person in need of improved vision, wherein
a first surface of the lens varies across at least a portion of the lens to form a first surface power map;
the first surface power map comprises a spiral, with a power that varies substantially periodically both radially outwards from and angularly about an optical axis of the lens;
a radial variation has a period that is substantially constant across the portion and that is greater than 100 microns.

Assignees

• Coopervision Int Ltd

Inventors

• Webber Martin

Classifications

• G02C2202/20

  Diffractive and Fresnel lenses or lens portions · CPC title

• G02C7/027

  considering wearer's parameters · CPC title

• G02C2202/24

  Myopia progression prevention · CPC title

• A61F2/1618

  Multifocal lenses · CPC title

• B29D11/00038

  Production of contact lenses · CPC title