Multifocal ophthalmic lenses and related methods

Patent metadata

Field	Value
Publication number	US-11762220-B2
Application number	US-202117228757-A
Country	US
Kind code	B2
Filing date	Apr 13, 2021
Priority date	Apr 30, 2020
Publication date	Sep 19, 2023
Grant date	Sep 19, 2023

Abstract

A multifocal ophthalmic lens wherein a first surface of the lens is shaped to form a surface power map and a second surface of the lens is shaped to form a second surface power map. The first surface power map and the second surface power map together form a lens power map. The first surface power map, the second surface power map, or the lens power map comprises a spiral. The spiral has a variation across at least a portion of the lens. Methods of making and using such lenses are also provided.

First claim

The invention claimed is:

1. A multifocal ophthalmic lens, wherein:
a first surface of the lens is shaped to form a first surface power map;
a second surface of the lens is shaped to form a second surface power map;
the first and second surface power maps together form a lens power map;
the first surface power map, the second surface power map, or the lens power map comprises a spiral, the spiral having a variation across at least a portion of the lens, the spiral having a first periodic component, in a radial direction extending outwards from the centre of the portion, and a second periodic component having a substantially constant period, in an azimuthal direction about the centre of the portion.

2. The multifocal ophthalmic lens according to claim 1 , wherein:
the first periodic component has a period of greater than 100 microns; and
the second periodic component has a period of greater than 6 degrees.

3. The multifocal ophthalmic lens according to claim 1 , wherein the variation of the spiral comprises an offset in power, the offset changing according to a radial distance from the centre of the portion.

4. The multifocal ophthalmic lens according to claim 1 , wherein a peak power of one or more arms of the spiral varies according to one or both of: a radial distance from the centre of the portion and an azimuthal position about the centre of the portion.

5. The multifocal ophthalmic lens according to claim 1 , wherein:
a peak power of each arm of the spiral does not vary with radial distance from the centre of the portion; and
the peak power of at least one arm of the spiral differs from that of the other arms.

6. The multifocal ophthalmic lens according to claim 1 , wherein each of the first surface power map and the second surface power map vary smoothly across the portion.

7. The multifocal ophthalmic lens according to claim 1 , wherein:
the portion of the lens comprises a central region and an outer region, the outer region surrounding the central region;
the lens power map within the outer region comprises the spiral; and
the lens power map does not vary periodically within the central region.

8. The multifocal ophthalmic lens according to claim 7 , wherein the central region has a diameter of less than 50% of that of the portion.

9. The multifocal ophthalmic lens according to claim 7 , wherein:
the lens comprises a transition region, the transition region surrounding the central region and the outer region surrounding the transition region; and
the lens power map varies such that the transition region provides a smooth transition between the central zone and the outer zone.

10. The multifocal ophthalmic lens according to claim 1 , wherein a twist rate of the spiral varies according to a radial distance from the centre of the portion.

11. The multifocal ophthalmic lens according to claim 1 , wherein a width of one or more arms of the spiral differs from a corresponding width of the other arms of the spiral.

12. The multifocal ophthalmic lens according to claim 11 , wherein, at a pre-determined radial distance from the centre of the portion, the spiral changes its direction of rotation.

13. The multifocal ophthalmic lens according to claim 1 , wherein the ophthalmic lens is a contact lens, a spectacle lens, or an intraocular lens.

14. A method of manufacturing a multifocal ophthalmic lens, the method comprising:
operating a lathe to shape a first surface of one of: a lens, a mould for a lens, or an insert for manufacturing a mould for a lens to form a first surface power map;
operating a lathe to shape a second surface of the lens, mould, or insert to form a second surface power map;
wherein:
the combination of the first and second surface power maps forms a lens power map;
the first surface power map, the second surface power map, or the lens power map comprises a spiral, the spiral having a variation across at least a portion of the lens, mould or insert, the spiral having a first periodic component, in a radial direction extending outwards from the centre of the portion, and a second periodic component having a substantially constant period, in an azimuthal direction about the centre of the portion.

15. A method of improving vision of a person, the method comprising:
providing the multifocal ophthalmic lens according to claim 1 to a person in need of improved vision.

16. The multifocal ophthalmic lens according to claim 1 , wherein the ophthalmic lens is a centre distance contact lens, or a centre near contact lens.

17. The multifocal ophthalmic lens according to claim 7 , wherein the central region has an optical power corresponding to a distance vision correction.

18. The multifocal ophthalmic lens according to claim 7 , wherein the central region has an optical power corresponding to a near vision correction.

Assignees

• Coopervision Int Ltd

Inventors

• Webber Martin
• Lazon De La Jara Percy

Classifications

• G02C7/044 Primary

  Annular configuration, e.g. pupil tuned · CPC title

• G02C2202/24

  Myopia progression prevention · CPC title

• G02C7/066

  Shape, location or size of the viewing zones · CPC title

• G02C7/042 Primary

  Simultaneous type · CPC title

• G02C7/022 Primary

  Ophthalmic lenses having special refractive features achieved by special materials or material structures (G02C7/049 takes precedence) · CPC title