Spectacle lens design, spectacle lens kit and method of manufacturing a spectacle lens
A spectacle lens design includes a first zone which has a focal power that provides a focused image on the fovea and a given a height and width. A second zone at least partly surrounds the first zone and contains at least one of the following: (i) focusing structures providing a focal power resulting in a myopic defocus or (ii) diffusing structures, such as scattering centers, leading to a diffusion of light passing the second zone. The first zone is curved to follow the converging line of sight of the wearer upon reading and contains a nasal segment, a temporal segment, and a central segment located between the nasal segment and the temporal segment The nasal segment and the temporal segment are shifted downwards with respect to the central segment.
1 . A spectacle lens kit comprising:
a spectacle lens including:
a first zone, the first zone having a first focal power configured for vision of a wearer's eye at a near distance; and
at least one second zone at least partly surrounding the first zone, wherein the second zone contains at least one of the following:
(i) focusing structures having a second focal power being higher than the first focal power, or
(ii) diffusing structures configured to diffuse light passing the at least one second zone; and
instructions including an as-worn position of the spectacle lens relative to the a wearer's eye and a predetermined object distance model that includes object distances for different viewing directions under which the wearer should see clearly when the spectacle lens is worn according to the as-worn position,
the first zone including a nasal segment and a central segment, the nasal segment being shifted downward with respect to the central segment, such that the first zone is curved to follow a converging line of sight of the wearer upon reading when the spectacle lens is positioned relative to the eye of the wearer according to the as-worn position and an arrangement of an object according to the predetermined object distance model.
2 . The spectacle lens kit as claimed in claim 1 , wherein the first zone has a width and a height, the width and the height of the first zone being at least one from the following group:
a) the width of the first zone being at least three times the height of the first zone,
b) the width of the first zone being at least four times the height of the first zone, or
c) the width of the first zone being at least five times the height of the first zone.
3 . The spectacle lens kit as claimed in claim 1 , wherein the first zone has a height and a width, the height and the width of the first zone being at least one of the following group:
a) the height of the first zone being uniform along at least a part of the width of the first zone, wherein the uniform height of the first zone within the part is a value in the range between 3 mm and 5 mm, and wherein the part of the width is at least three times the uniform height,
b) wherein the uniform height of the first zone along the part of the width is a value in the range between 3 mm and 5 mm, and wherein the part of the width is at least four times the uniform height,
c) wherein the uniform height of the first zone along the part of the width is a value in the range between 4 mm and 5 mm, and wherein the part of the width is at least three times the uniform height, or
d) wherein the uniform height of the first zone along the part of the width is a value in the range between 4 mm and 5 mm, and wherein the part of the width is at least four times the uniform height.
4 . The spectacle lens kit as claimed in claim 1 , wherein at least one of the following applies:
the height of the first zone is configured to cover a vertical viewing angle of 0.8 to 1.5 degrees when the spectacle lens is positioned according to the as-worn position, and/or
the width of the first zone matches the width of the spectacle lens.
5 . The spectacle lens kit as claimed in claim 1 , wherein the first zone further comprises:
a temporal segment, wherein the temporal segment is shifted downwards with respect to the central segment.
6 . A data set stored on a non-transitory computer-readable medium, the data set comprising at least one kind of the following kinds of data:
(i) a numerical representation of the spectacle lens as claimed in claim 1 , wherein the numerical representation of the spectacle lens is configured to be used for a manufacture of the spectacle lens,
(ii) the numerical representation of the spectacle lens as claimed in claim 1 , wherein the numerical representation of the spectacle lens is configured to be used by one or more manufacturing machines in order to manufacture the spectacle lens, or
(iii) data containing computer-readable instructions for controlling one or more manufacturing machines to produce the spectacle lens as claimed in claim 1 .
7 . The spectacle lens kit as claimed in claim 1 , wherein a geometric center of the first zone is located at least vertically off-center with respect to a penetration point of a center ray of a bundle of rays which penetrates the spectacle lens when reading while looking straight ahead at the reading target and shifted temporal-wards if the spectacle lens is to be used for the right eye or the left eye and nasal-wards if the spectacle lens is to be used for the respective other eye.
8 . A data set stored on a computer-readable medium and comprising at least one kind of the following kinds of data:
(i) a numerical representation of the spectacle lens kit as claimed in claim 1 including a numerical representation of the spectacle lens and a numerical representation of the instructions including the as-worn position of the spectacle lens,
(ii) the numerical representation of the spectacle lens kit as claimed in claim 1 including the numerical representation of the spectacle lens and the numerical representation of the instructions including the as-worn position of the spectacle lens, wherein the numerical representation of the spectacle lens is configured to be used by one or more manufacturing machines to manufacture the spectacle lens, or
(iii) the numerical representation of the spectacle lens kit as claimed in claim 1 including the numerical representation of the spectacle lens and the numerical representation of the instructions including the as-worn position of the spectacle lens and data containing computer-readable instructions for controlling one or more manufacturing machines to produce the spectacle lens.
9 . The computer-implemented method as claimed in claim 1 , further comprising:
manufacturing the spectacle lens according to the design.
10 . A computer-implemented method of designing a spectacle lens for the purpose of a use of the design for a manufacture of the spectacle lens, the method comprising:
designing the spectacle lens to include a second zone with at least one of:
(i) focusing structures having a second focal power being higher than a first focal power, or
(ii) diffusing structures configured to diffuse light passing the second zone, wherein the second zone is configured to define a first zone, by at least partly surrounding the first zone, the first zone including a nasal segment and a central segment, the nasal segment being shifted downward with respect to the central segment, and having the first focal power,
wherein designing the second zone includes defining the first zone by the at least partly surrounding second zone to be curved so as to follow a converging line of sight of the wearer upon reading, when the spectacle lens is positioned relative to the eye of a wearer according to an as-worn position and an arrangement of an object according to a predetermined object distance model that includes object distances for different viewing directions under which the wearer should see clearly when the spectacle lens is worn according to the as-worn position, and
wherein the first focal power is configured for vision of the eye of the wearer at a near distance.
11 . The computer-implemented method as claimed in claim 10 , wherein the first zone is designed to have a width and a height, the width and the height of the first zone being at least one of the following group:
a) the width of the first zone being at least three times the height of the first zone,
b) the width of the first zone being at least four times the height of the first zone, or
c) the width of the first zone being at least five times the height of the first zone.
12 . The computer-implemented method as claimed in claim 10 , wherein the first zone is designed to have a height and a width, the height and the width of the first zone being at least one of the following group:
a) the height of the first zone being uniform along at least a part of the width of the first zone, wherein the uniform height of the first zone within the part of the width has a value in the range between 3 mm and 5 mm, and wherein the part of the width is at least three times the uniform height,
b) wherein the uniform height of the first zone along the part of the width has a value in the range between 3 mm and 5 mm, and wherein the part of the width is at least four times the uniform height,
c) wherein the uniform height of the first zone along the part of the width has a value in the range between 4 mm and 5 mm, and wherein the part of the width is at least three times the uniform height, or
d) wherein the uniform height of the first zone along the part has a value in the range between 4 mm and 5 mm, and wherein the part of the width is at least four times the uniform height.
13 . The computer-implemented method as claimed in claim 10 , wherein at least one of the following applies:
the second zone is designed such that the first zone defined by the at least partly surrounding second zone has such dimensions as to cover a vertical viewing angle of 0.8 to 1.5 degree when the designed spectacle lens is positioned according to the as-worn position, and/or
the second zone is designed such that the width of the first zone matches the width of the spectacle lens design.
14 . A computer program stored on a non-transitory storage medium for designing a spectacle lens for the purpose of a use of the design for a manufacture of the spectacle lens, the spectacle lens to be positioned relative to an eye of a wearer according to a given as-worn position and the predetermined object distance model that includes object distances for different viewing directions under which the spectacle wearer should see clearly when the spectacle lens is worn according to the as-worn position, the computer program comprising instructions that, when executed on a computer, prompt the computer to perform the computer-implemented method as claimed in claim 10 .
15 . The computer-implemented method as claimed in claim 10 , wherein the first zone defined by the at least partly surrounding second zone further includes a temporal segment, wherein the first zone is curved such that the temporal segment is shifted downwards with respect to the central segment.
16 . The computer-implemented method as claimed in claim 10 , wherein at least one of the following applies:
the first zone has such dimensions as to cover a vertical viewing angle of 0.8 to 1.5 degree when the designed spectacle lens is positioned according to the as-worn position,
the width of the first zone matches the width of the spectacle lens design, or
the width of the first zone is at least six times the height of the first zone.
17 . The computer-implemented method as claimed in claim 10 , wherein a geometric center of the first zone is located at least vertically off-center with respect to a penetration point of a center ray of a bundle of rays which penetrates the spectacle lens when reading while looking straight ahead at the reading target and shifted temporal-wards if the designed spectacle lens is to be used for the right eye or the left eye and nasal-wards if the designed spectacle lens is to be used for the respective other eye.
18 . A spectacle lens comprising:
a first zone having a focal power, the first zone having a height and a width; and
at least one second zone at least partly surrounding the first zone, wherein the second zone contains at least one of the following:
(i) focusing structures having a positive additional power with respect to the focal power of the first zone; or
(ii) diffusing structures configured to diffuse light passing the at least one second zone,
wherein the width of the first zone is at least four times the height of the first zone, and
wherein the first zone includes a nasal segment, a temporal segment, and a central segment located between the nasal segment and the temporal segment, the first zone being curved such that the nasal segment and/or the temporal segment are shifted downwards with respect to the central segment.
19 . The spectacle lens as claimed in claim 18 , wherein the width of the first zone matches the width of the spectacle lens or wherein the width of the first zone is at least six times the height of the first zone.
20 . A spectacle lens kit comprising:
the spectacle lens as claimed in claim 18 ; and
instructions including an as-worn position of the spectacle lens, wherein the height of the first zone is configured to cover a vertical viewing angle of 0.8 to 1.5 degree when the spectacle lens is positioned according to the as-worn position, wherein the as-worn position is the position, including orientation, of the spectacle lenses relative to the eyes and face during wear as defined in DIN ISO 13666:2019, section 3.2.36.
21 . A computer-implemented method of designing a spectacle lens for the purpose of a use of the design for a manufacture of the spectacle lens, the method comprising:
designing a second zone at least partly surrounding a first zone having a height and a width, the second zone including at least one of:
(i) focusing structures providing a positive additional power with respect to the focal power present in the first zone, or
(ii) diffusing structures configured to diffuse light,
wherein the first zone includes a nasal segment and a central segment, the nasal segment being shifted downward with respect to the central segment, and has a width and a height, the width of the first zone being at least four times the height of the first zone; and
designing the second zone such that the first zone is curved so as to follow a converging line of sight of the wearer wearing the spectacle lens in an as-worn position upon reading.
22 . A computer program stored on a non-transitory storage medium and comprising instructions which, when the program is executed by a computer, cause the computer to carry out the method as claimed in claim 21 .
23 . A method of manufacturing a spectacle lens to be positioned relative to an eye of a wearer according to a given as-worn position, the method comprising:
providing the spectacle lens with a focal power, and
forming in a zone of the spectacle lens at least one of:
(i) focusing structures providing a positive additional power with respect to the focal power, or
(ii) diffusing structures configured to diffuse light,
wherein the zone is formed as a second zone that defines a first zone by at least partly surrounding the first zone, the first zone having a height and a width, wherein the second zone is formed with such dimensions that the width of the first zone defined by the at least partly surrounding second zone is at least four times the height of the first zone,
wherein the second zone is formed such that the first zone defined by the at least partly surrounding second zone includes a nasal segment, a temporal segment, and a central segment located between the nasal segment and the temporal segment, and
wherein the first zone is curved such that the nasal segment and/or the temporal segment are shifted downwards with respect to the central segment.