Lens Design Method, Lens Manufacturing Method, Storage Medium, And Lens Design System

• US 20170090214A1
• Filed: 12/12/2016
• Published: 03/30/2017
• Est. Priority Date: 06/18/2014
• Status: Active Grant

• Current Assignee: Nikon-Essilor Co., Ltd.
• Original Assignee: Nikon-Essilor Co., Ltd.
• Inventors: HONMA, Yukio
• Granted Patent: US 10,386,652 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G02C 7/027 considering wearer's parameters
• CPC Class Codes: G02C 7/028 Special mathematical design techniques
• CPC Class Codes: G02C 7/06 bifocal; multifocal ; progressive G02C7/041 takes precedence
• CPC Class Codes: G02C 7/068 Special properties achieved by the combination of the front and back surfaces

Abstract

A lens design method includes: changing curve data including a curve value of a distance vision part and a curve value of a near vision part of a progressive power lens on an object side and a curve value of a distance vision part and a curve value of a near vision part of the progressive power lens on an eyeball side so as to be suited to prescription values to calculate a plurality of sets of the curve data; and calculating, for each of the calculated sets of the curve data, a thickness at a second position on the progressive power lens that satisfies thickness conditions for a first position on the progressive power lens.

Claims

1. A lens design method comprising;

changing curve data including a curve value of a distance vision part and a curve value of a near vision part of a progressive power lens on an object side and a curve value of a distance vision part and a curve value of a near vision part of the progressive power lens on an eyeball side under conditions suited to prescription values to calculate a plurality of sets of the curve data; and

calculating, for each of the calculated sets of the curve data, a thickness at a second position on the progressive power lens that satisfies thickness conditions for a first position on the progressive power lens.

2. The lens design method of claim 1, comprising changing the curve data between an upper limit value and a lower limit value that are determined by prescription values of a spherical power, an addition, an astigmatism axis, and an astigmatic power.

3. The lens design method of claim 2, comprising acquiring the tipper limit value and the lower limit value from a table function arguments of which are the spherical power, the addition, the astigmatism axis, and the astigmatic power.

4. The lens design method of claim 1, comprising changing the curve data in steps of a predetermined value.

5. The lens design method of claim 1, comprising changing the curve data by using shape information on a frame to be mounted with the progressive power lens and at least a part of wearer information including at least one information on a vertex distance, a dominant eye, or a near working distance of a wearer.

6. The lens design method of claim 1, comprising calculating the curve values included in the curve data by using a radius of curvature of the distance vision part and a radius of curvature of the near vision part of the progressive power lens on the object side and a radius of curvature of the distance vision part and a radius of curvature of the near vision part of the progressive power lens on the eyeball side.

7. The lens design method of claim 1, comprising extracting, from the plurality of sets of the curve data, the curve data in which the thickness at the second, position satisfies a predetermined condition.

8. The lens design method of claim 7, wherein the predetermined condition comprises a condition that the thickness at the second position is minimum.

9. The lens design method of claim 7, wherein the predetermined condition comprises a condition that the thickness at the second position is closest to a designated value.

10. The lens design method of claim 1, wherein the second position is set to an optical center of the progressive power lens.

11. The lens design method of claim 1, wherein the second position is set to an edge of the progressive power lens.

12. The lens design method of claim 7, comprising setting at least one of a shape of an object-side surface of the progressive power lens or a shape of an eyeball-side surface of the progressive power lens by using at least one of an eccentric position, a corridor length, addition distribution information, a far point, a near point, and a reference center thickness in addition to the curve data satisfying the predetermined condition.

13. A lens manufacturing method comprising:

designing a progressive power lens by the lens design method of claim 1; and

manufacturing a progressive power lens in accordance with the design.

14. A nontransitory storage medium storing therein a program that causes a computer to execute:

changing curve data including a curve value of a distance vision part and a curve value of a near vision part of a progressive power lens on an object side and a curve value of a distance vision part and a curve value of a near vision part of the progressive power lens on an eyeball side under conditions suited to prescription values to calculate a plurality of sets of the curve data; and

calculating, for each of the calculated sets of the curve data, a thickness at a second position on the progressive power lens that satisfies thickness conditions for a first position on the progressive power lens.

15. A lens design system comprising:

a first calculation unit that changes curve data including a curve value of a distance vision part and a curve value of a near vision part of a progressive power lens on an object side and a curve value of a distance vision part and a curve value of a near vision part of the progressive power lens on an eyeball side under conditions suited to prescription values to calculate a plurality of sets of the curve data; and

a second calculation unit that calculates, for each of the calculated sets of the curve data, a thickness at a second position on the progressive power lens that satisfies thickness conditions for a first position on the progressive power lens.