Myopia control lens and related methods

Patent metadata

Field	Value
Publication number	US-11934043-B2
Application number	US-202117228755-A
Country	US
Kind code	B2
Filing date	Apr 13, 2021
Priority date	Apr 30, 2020
Publication date	Mar 19, 2024
Grant date	Mar 19, 2024

Abstract

An ophthalmic lens for myopia control. A first surface of the lens varies across the lens to form a first surface power map. A second surface of the lens varies across the lens to form a second surface power map. Each of the first and second surface power maps comprise a spiral. The spirals formed by the first and second surface power maps twist in opposing directions. Related methods are also described.

First claim

The invention claimed is:

1. An ophthalmic lens for controlling progression of myopia, the lens including an outer surface that is convex, the outer surface shaped to form a first surface power map, and an inner surface that is concave, the inner surface shaped to form a second surface power map, wherein:
the first surface power map comprises a spiral;
the second surface power map comprises a spiral; and
the spirals provided by the first and second surface power maps twist in opposing directions.

2. The ophthalmic lens according to claim 1 , wherein the lens is a contact lens or a spectacle lens.

3. The ophthalmic lens according to claim 1 , wherein the power varies smoothly across the first and second surface power maps.

4. The ophthalmic lens according to claim 3 , wherein the power of the inner and outer surfaces varies both radially and angularly as a rounded square wave or a sinusoid.

5. The ophthalmic lens according to claim 1 , wherein each of the first and second power maps has a power that varies substantially periodically both radially outwards from and angularly about an optical axis of the lens.

6. The ophthalmic lens according to claim 5 , wherein the periods of the radial and angular variations are each substantially constant across the first and second surface power maps.

7. The ophthalmic lens according to claim 5 , wherein a period of one or more of the radial and angular variations 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.

8. The ophthalmic lens according to claim 5 , wherein:
the radial variation has a period of greater than 100 microns; and
the angular variation has a period of greater than 6 degrees.

9. The ophthalmic lens according to claim 1 , wherein the spirals formed on the first and second surface power maps twist in opposing directions but are otherwise substantially identical.

10. The ophthalmic lens according to claim 1 , wherein each spiral comprises at least four arms.

11. The ophthalmic lens according to claim 1 , wherein each arm of each spiral twists through at least half a rotation.

12. The ophthalmic lens according to claim 1 , wherein:
the lens comprises 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 spirals are formed in the outer region; and
the spirals do not extend into the central region.

13. The ophthalmic lens according to claim 12 , wherein the central region has a diameter of less than 50% of that of the spirals.

14. The ophthalmic lens according to claim 12 , 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.

15. The ophthalmic lens according to claim 1 , wherein:
the lens comprises 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 spirals are formed within the central region; and
the spirals do not extend into the outer region.

16. A method of controlling myopia progression in a person, the method comprising:
providing the multifocal ophthalmic lens according to claim 1 to a person in need of control of myopia progression.

17. The ophthalmic lens according to claim 1 , wherein each spiral comprises a plurality of arms, and each of the plurality of arms comprises a peak arm and a trough arm.

18. A method of manufacturing an ophthalmic lens, the method comprising:
operating a lathe to shape a concave surface and a convex surface of one of: a lens, a mould for a lens, or an insert for manufacturing a mould for a lens such that:
the concave surface forms a first surface power map;
the convex surface forms a second surface power map;
the first surface power map and the second surface power map each comprise a spiral; and
the spirals formed by the first surface power map and the second surface power map twist in opposing directions.

Assignees

• Coopervision Int Ltd

Inventors

• Webber Martin

Classifications

• G02C7/04 Primary

  Contact lenses for the eyes (disinfection or sterilisation of contact lenses A61L12/00) · CPC title

• G02C2202/24

  Myopia progression prevention · CPC title

• G02C7/042 Primary

  Simultaneous type · CPC title

• G02C7/02 Primary

  Lenses; Lens systems {; Methods of designing lenses} · CPC title

• G02C7/022 Primary

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