Progressive spectacle lens having a variable refractive index and method for the design and production thereof

Patent metadata

Field	Value
Publication number	US-10838231-B2
Application number	US-201916515496-A
Country	US
Kind code	B2
Filing date	Jul 18, 2019
Priority date	Jan 20, 2017
Publication date	Nov 17, 2020
Grant date	Nov 17, 2020

Abstract

A product includes a progressive power spectacle lens or a representation, stored on a data storage medium, of the progressive power spectacle lens. The progressive power spectacle lens has a front surface and a back surface and a spatially varying refractive index, wherein the front surface and/or the back surface is embodied as a progressive surface. The front surface is formed as a free-form surface in such a way that the maximum of the absolute value of the mean curvature of the front surface lies in the intermediate corridor and/or the back surface is formed as a free-form surface in such a way that the minimum of the absolute value of the mean curvature of the back surface lies in the intermediate corridor. Further, a computer-implemented method for planning a progressive power spectacle lens with a spatially varying refractive index and a progressive surface is disclosed.

First claim

The invention claimed is:

1. A product comprising a progressive power spectacle lens or a representation of the progressive power spectacle lens stored on a non-transitory data storage medium as computer-readable data, wherein the progressive power spectacle lens comprises:
a front surface;
a back surface; and
a spatially varying refractive index,
wherein either (i) the front surface is a progressive surface or (ii) the back surface is a progressive surface,
wherein in case (i) the front surface is the progressive surface, a maximum of an absolute value of mean curvature of the front surface lies in an intermediate corridor or in case (ii) the back surface is the progressive surface, a minimum of the absolute value of the mean curvature of the back surface lies in the intermediate corridor, and
wherein the intermediate corridor is a region of the progressive power spectacle lens providing a clear vision for ranges intermediate between distance and near.

2. The product as claimed in claim 1 , wherein at least one of the front surface or the back surface is a free-form surface, wherein the free-form surface has no point symmetry and no axial symmetry or wherein the free-form surface has no point symmetry and no axial symmetry and no rotational symmetry and no symmetry with respect to a plane of symmetry.

3. The product as claimed in claim 1 , wherein the product further comprises a representation, stored on the non-transitory data storage medium, of a predetermined arrangement of the progressive power spectacle lens in front of an eye of a progressive power spectacle wearer, for whom the progressive power spectacle lens is intended,
wherein the progressive power spectacle lens has a distribution of a spherical equivalent for the predetermined arrangement of the progressive power spectacle lens in front of the eye of the progressive power spectacle wearer, for whom the progressive power spectacle lens is intended,
wherein the intermediate corridor has a width, wherein a refractive index of the progressive power spectacle lens varies in space such that the width of the intermediate corridor of the progressive power spectacle lens, at least in a section or over an entire length of the intermediate corridor, is greater than the width of the intermediate corridor of a comparison progressive power spectacle lens with a spatially non-variable refractive index, but with a same distribution of the spherical equivalent in a same arrangement of the comparison progressive power spectacle lens in front of the eye of the progressive power spectacle wearer.

4. The product as claimed in claim 3 , wherein the section is selected from the group consisting of:
a horizontal section,
a section at half addition,
the horizontal section at half addition,
the horizontal section at half addition and a horizontal section at 25% of an addition,
the horizontal section at half addition and a horizontal section at 75% of the addition, and
the horizontal section at half addition, the horizontal section at 25% of the addition, and the horizontal section at 75% of the addition.

5. The product as claimed in claim 3 , further comprising at least one of:
(i) a representation, stored on the non-transitory data storage medium, of a residual astigmatism distribution for the predetermined arrangement of the progressive power spectacle lens in front of the eye of the progressive power spectacle wearer, for whom the progressive power spectacle lens is intended;
(ii) a representation, stored on the non-transitory data storage medium, of an astigmatic power distribution, required for a full correction, for the predetermined arrangement of the progressive power spectacle lens in front of the eye of the progressive power spectacle wearer, for whom the progressive power spectacle lens is intended;
(iii) a representation, stored on the non-transitory data storage medium, of a prescription and an object distance model for the predetermined arrangement of the progressive power spectacle lens in front of the eye of a progressive power spectacle wearer, for whom the progressive power spectacle lens is intended; or
(iv) a representation, stored on the non-transitory data storage medium, of a distribution of the spherical equivalent for the predetermined arrangement of the progressive power spectacle lens in front of the eye of the progressive power spectacle wearer, for whom the progressive power spectacle lens is intended,
wherein the progressive power spectacle lens has a distance portion and a near portion, and
wherein the width of the intermediate corridor corresponds to a dimension transverse to a longitudinal direction of the intermediate corridor extending between the distance portion and the near portion, within which the absolute value of the residual astigmatism lies below a predetermined limit value, which is selected within a range from the group consisting of:
(a) the limit value lies in the range between 0.25 dpt and 1.5 dpt,
(b) the limit value lies in the range between 0.25 dpt and 1.0 dpt,
(c) the limit value lies in the range between 0.25 dpt and 0.75 dpt,
(d) the limit value lies in the range between 0.25 dpt and 0.6 dpt,
(e) the limit value lies in the range between 0.25 dpt and 0.5 dpt, and
(f) the limit value is 0.5 dpt.

6. The product as claimed in claim 1 , wherein the product further comprises a representation, stored on the non-transitory data storage medium, of a predetermined arrangement of the progressive power spectacle lens in front of an eye of a progressive power spectacle wearer, for whom the progressive power spectacle lens is intended,
wherein the progressive power spectacle lens has a distribution of a spherical equivalent for the predetermined arrangement of the progressive power spectacle lens in front of the eye of the progressive power spectacle wearer, for whom the progressive power spectacle lens is intended,
wherein the product further comprises at least one of:
(i) a representation, stored on the non-transitory data storage medium, of a residual astigmatism distribution for the predetermined arrangement of the progressive power spectacle lens in front of the eye of the progressive power spectacle wearer, for whom the progressive power spectacle lens is intended;
(ii) a representation, stored on the non-transitory data storage medium, of an astigmatic power distribution, required for a full correction, for the predetermined arrangement of the progressive power spectacle lens in front of the eye of the progressive power spectacle wearer, for whom the progressive power spectacle lens is intended;
(iii) a representation, stored on the non-transitory data storage medium, of a prescription and an object distance model for the predetermined arrangement of the progressive power spectacle lens in front of the eye of a progressive power spectacle wearer, for whom the progressive power spectacle lens is intended; or
(iv) a representation, stored on the non-transitory data storage medium, of a distribution of the spherical equivalent for the predetermined arrangement of the progressive power spectacle lens in front of the eye of the progressive power spectacle wearer, for whom the progressive power spectacle lens is intended,
wherein the refractive index of the progressive power spectacle lens varies in space such that a maximum value of the residual astigmatism of the progressive power spectacle lens is less than the maximum value of the residual astigmatism of a comparison progressive power spectacle lens with the same distribution of the spherical equivalent in the case of the same arrangement of the comparison progressive power spectacle lens in front of the eye of the progressive power spectacle wearer, but with a spatially non-variable refractive index.

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Assignees

• Zeiss Carl Vision Int Gmbh

Inventors

• Kelch Gerhard
• Menke Christoph
• Wietschorke Helmut

Classifications

• G02C7/065

  Properties on the principal line · CPC title

• G02C7/063

  Shape of the progressive surface · CPC title

• G02C7/061

  Spectacle lenses with progressively varying focal power · CPC title

• G02C7/028

  Special mathematical design techniques · CPC title

• G02C7/027 Primary

  considering wearer's parameters · CPC title