Spectacle lens and method

Abstract

The invention relates to a spectacle lens comprising a ring-shaped structure and a simply connected zone, said simply connected zone comprising an optical centre of the spectacle lens or a fitting point of the spectacle lens, said optical centre being defined as in ISO 13666:2019(E), entry 3.2.15, said fitting point being as defined in ISO 13666:2019(E), entry 3.2.34, said simply connected zone being limited by a ring-shaped onset line of said ring-shaped structure, said ring-shaped onset line of said ring-shaped structure having a maximal distance to a centroid of said ring-shaped onset line, a minimal distance to said centroid of said ring-shaped onset line, and a mean distance to said centroid of said ring-shaped onset line, the spectacle lens being characterized in that a reference circle is having more than eight intersections with said ring-shaped onset line, said reference circle being centred at said centroid of said ring- shaped onset line, a radius of said reference circle being equal to said mean distance of said ring- shaped onset line to said centroid of said ring-shaped onset line, and a ratio between said maximal distance of said ring-shaped onset line to said centroid of said ring-shaped onset line and said minimal distance of said ring-shaped onset line to said centroid of said ring-shaped onset line is above a predefined threshold.

Description

[0001] Spectacle lens and method

[0002] Field of the invention

[0003] The present invention relates to a spectacle lens according to the preamble of claim 1 , according to the preamble of claim 8 or according to the preamble of claim 12, to a kit according to the preamble of claim 14 or according to the preamble of claim 17, and to a method being configured for calculating, by a computer, data of a spectacle lens for the purpose of a use of said data for a manufacture of the spectacle lens according to the preamble of claim 21 or according to the preamble of claim 23.

[0004] Related prior art

[0005] TW 201939117 A discloses a lens having a star-shaped clear zone whose largest dimension is in vertical direction and in horizontal direction.

[0006] Problem to be solved

[0007] Departing from TW 201939117 A describing the star-shaped clear zone ensuring clear vision when reading, i.e., when the eyes mainly moves horizontally and vertically whereas an oblique direction is rarely used, the problem underlying the present invention is to provide a spectacle lens ensuring clear vision not only for reading.

[0008] Summary of the invention

[0009] The problem has been solved by the spectacle lens according to claim 1 , alternatively by the spectacle lens according to claim 8, or alternatively by the spectacle lens according to claim 12, by the kit according to claim 14, or alternatively by the kit according to claim 17, and by the method according to claim 21 , or alternatively by the method according to claim 23.

[0010] Any definition or explanation shall apply throughout the description, unless specified otherwise.

[0011] The spectacle lens comprises i) a ring-shaped structure and ii) a simply connected zone, said simply connected zone comprising an optical centre of the spectacle lens or a fitting point of the spectacle lens, said optical centre being defined as in

[0012] ISO 13666:2019(E), entry 3.2.15, said fitting point being as defined in ISO 13666:2019(E), entry

[0013] 3.2.34, said simply connected zone being limited by a ring-shaped onset line of said ring-shaped structure, said ring-shaped onset line of said ring-shaped structure having

[0014] - a maximal distance to a centroid of said ring-shaped onset line,

[0015] - a minimal distance to said centroid of said ring-shaped onset line, and

[0016] - a mean distance to said centroid of said ring-shaped onset line, the spectacle lens being characterized in that a reference circle is having more than eight intersections with said ring-shaped onset line, said reference circle being centred at said centroid of said ringshaped onset line, a radius of said reference circle being equal to said mean distance of said ringshaped onset line to said centroid of said ring-shaped onset line, and a ratio between said maximal distance of said ring-shaped onset line to said centroid of said ringshaped onset line and said minimal distance of said ring-shaped onset line to said centroid of said ring-shaped onset line is above a predefined threshold.

[0017] In particular, the spectacle lens comprises i) a ring-shaped structure and ii) a structure-free simply connected zone, said structure-free simply connected zone comprising an optical centre of the spectacle lens or a fitting point of the spectacle lens, said optical centre being defined as in ISO 13666:2019(E), entry 3.2.15, said fitting point being as defined in

[0018] ISO 13666:2019(E), entry 3.2.34, said structure-free simply connected zone being limited by a ring-shaped onset line of said ringshaped structure, said ring-shaped onset line of said ring-shaped structure having

[0019] - a maximal distance to a centroid of said ring-shaped onset line,

[0020] - a minimal distance to said centroid of said ring-shaped onset line, and

[0021] - a mean distance to said centroid of said ring-shaped onset line, said ring-shaped onset line of said ring-shaped structure passes along each onset of said ring-shaped structure, each onset of said ring-shaped structure is, along a perimeter of said structure-free simply connected zone i) a first position along any line from said optical centre of said spectacle lens towards a periphery of said spectacle lens in which a surface of saif ring-shaped structure differs in surface power from a surface of said spectacle lens comprising said ring-shaped structure or ii) or ii) a first position along any line from said fitting point of said spectacle lens towards a periphery of said spectacle lens in which a surface of said ring-shaped structure differs in surface power from a surface of said spectacle lens comprising said ring-shaped structure, the spectacle lens being characterized in that a reference circle is having more than eight intersections with said ring-shaped onset line, said reference circle being centred at said centroid of said ringshaped onset line, a radius of said reference circle being equal to said mean distance of said ring- shaped onset line to said centroid of said ring-shaped onset line, and a ratio between said maximal distance of said ring-shaped onset line to said centroid of said ringshaped onset line and said minimal distance of said ring-shaped onset line to said centroid of said ring-shaped onset line is above a predefined threshold, said predefined threshold is selected from at least one of the following threshold values:

[0022] - the ratio of said maximal distance to said minimal distance is above the predefined threshold of 2.0,

[0023] - the ratio of said maximal distance to said minimal distance is above the predefined threshold of 2.1 ,

[0024] - the ratio of said maximal distance to said minimal distance is above the predefined threshold of 2.2,

[0025] - the ratio of said maximal distance to said minimal distance is above the predefined threshold of 2.3.

[0026] A “spectacle lens” is as defined in ISO 13666:2019(E), entry 3.5.2, an ophthalmic lens (3.5.1) worn in front of, but not in contact with, an eyeball. The spectacle lens preferably is a finished spectacle lens, the finished spectacle lens as defined in ISO 13666:2019(E), entry 3.8.7, as spectacle lens (3.5.2) of which both sides have their final optical surface. As in note 1 to entry 3.8.7 of ISO 13666:2019(E), the finished spectacle lens can be either edged (cut) or uncut. The spectacle lens preferably is selected from one of the group consisting of

[0027] - a single-vision spectacle lens as defined in ISO 13666:2019(E), entry 3.7.1 , as spectacle lens (3.5.2) designed to provide a single dioptric power (3.10.3),

[0028] - a position-specific single-vision spectacle lens as defined in ISO 13666:2019(E), entry 3.7.2, as single-vision spectacle lens (3.7.1), generally with complex surface geometry, that needs to be positioned accurately according to an ordered specification and bears permanent alignment reference markings (3.15.25). As in note 1 to entry 3.7.2 of ISO 13666:2019(E), an example of position-specific single-vision spectacle lenses are those single-vision spectacle lenses (3.7.1) calculated to take into account an as-worn position (3.2.36) and therefore requiring accurate mounting in front of a wearer’s eye.

[0029] A “ring-shaped" structure is defined as a structure having a path within said structure that surrounds a structure-free domain of said structure from a point within said structure and ends in said point again. The structure-free domain of the ring-shaped structure is at least one of

[0030] I) a domain of the spectacle lens encircled or surrounded by said ring-shaped structure, said domain being outside a domain occupied by said ring-shaped structure or by any ring-shaped structure, ii) a domain of a surface of the spectacle lens encircled or surrounded by said ring-shaped structure, said domain being outside a domain occupied by said ring-shaped structure or by any ring-shaped structure. The surface of the spectacle lens preferably is either a front surface of the spectacle lens or a back surface of the spectacle lens, the front surface of the spectacle lens as defined in ISO 13666:2019(E), entry 3.2.13, the back surface of the spectacle lens as defined in ISO 13666:2019(E), entry 3.2.14. The surface of the spectacle lens may be selected from the group consisting of a spherical surface as defined in ISO 13666:2019(E), entry 3.4.1 , a cylindrical surface as defined in ISO 13666:2019(E), entry 3.4.2, an aspherical surface as defined in

[0031] ISO 13666:2019(E), entry 3.4.3, a toroidal surface as defined in ISO 13666:2019(E), entry 3.4.6, an atoroidal surface as defined in ISO 13666:2019(E), entry 3.4.7, a power-variation surface as defined in ISO 13666:2019(E), entry 3.4.10.

[0032] With respect to the spectacle lens comprising the ring-shaped structure and the structure-free simply connected zone, a ring-shaped “structure” is a domain of the spectacle lens having a surface power different to a surface power of the surface of the spectacle lens comprising said ring-shaped structure outside the domain occupied by the ring-shaped structure. In other words, in each position within a domain of the ring-shaped structure, the surface power of a surface of the ring-shaped structure is different to the surface power of the surface of the spectacle lens outside the domain of the ringshaped structure. This means, the ring-shaped structure is a ring-shaped domain of the spectacle lens having, in each position within the ring-shaped domain of the spectacle lens, the surface power different to the surface power of the surface of the spectacle lens outside the ring-shaped domain of the spectacle lens, the surface of the spectacle lens comprising the ring-shaped structure. Additionally, the ring-shaped structure may be the domain of the spectacle lens that has a luminous transmittance different to a luminous transmittance of the spectacle lens outside the domain occupied by the ring-shaped structure.

[0033] The surface power of the ring-shaped structure is defined analogously as in ISO 13666:2019(E), entry 3.10.4, as local ability of a surface of said ring-shaped structure to change a vergence of a bundle of rays incident at said surface of the ring-shaped structure in any position of said surface of said ringshaped structure. As in note 1 to entry 3.10.4 of ISO 13666:2019(E), the surface power of the ringshaped structure is determined from a radius or radii of the surface of the ring-shaped structure and a refractive index (3.1 .5) of a material of the ring-shaped structure, and is calculated for light (3.1.2) incident or emergent in air.

[0034] The surface power of the surface of the spectacle lens is defined analogously as in ISO 13666:2019(E), entry 3.10.4, as local ability of the surface of the spectacle lens to change a vergence of a bundle of rays at the surface in any position of said surface of the spectacle lens. Analogously as in note 1 to entry 3.10.4 of ISO 13666:2019(E), the surface power of the surface of the spectacle lens is determined from a radius or radii of the surface and a refractive index (3.1.5) of the optical material (3.3.1) of the spectacle lens, and is calculated for light (3.1.2) incident or emergent in air.

[0035] The luminous transmittance is as defined in ISO 13666:2019(E), entry 3.17.6, as ratio of a luminous flux transmitted by the spectacle lens (3.5.2) to the incident luminous flux for a specified ill u minant and photopic vision. The luminous transmittance is calculated as in note 1 to entry 3.17.6 of ISO 13666:2019(E).

[0036] Additionally to the before-mentioned difference in luminous transmittance or alternatively to the beforementioned difference in luminous transmittance, the ring-shaped structure may be a domain of the spectacle lens providing a) narrow angle scatter or b) wide angle scatter (haze). The narrow angle scatter is as defined in ISO 4007:2018(E), entry 3.8.15, forward scattered light (3.8.14) that deviates within a cone, with apex at a point of incidence and subtending less than 2.5° from an expected direction of propagation. The wide angle scatter is as defined in ISO 4007:2018(E), entry 3.8.16, forward scattered light (3.8.14) that deviates through angles of more than 2.5° from an expected direction of propagation.

[0037] A “simply connected zone” is a domain of the spectacle lens, said domain is path-connected and every path between two points in said domain can be continuously transformed into any other such path while preserving said two points. Preferably, the simply connected zone is the domain on the surface of the spectacle lens, said domain on said surface being path-connected and every path between two points in said domain can be continuously transformed into any other such path while preserving said two points. The simply connected zone is structure-free, i.e., the simply connected zone does not comprise any structure. In other words, the structure-free simply connected zone of the spectacle lens is calculated to provide an ordered power for correcting a wearer's vision, the ordered power as defined in ISO 13666:2019(E), entry 3.10.14. Thus, a structure-free simply connected zone of the spectacle lens is a domain of the spectacle lens comprising each x,y position that is comprised in said structure-free simply connected zone of both the front surface and the back surface of the spectacle lens.

[0038] The simply connected zone, i.e. the structure-free simply connected zone, comprises an optical centre of the spectacle lens or a fitting point of the spectacle lens. Preferably, the structure-free simply connected zone comprises the optical centre of the spectacle lens. The simply connected zone, i.e., the structure-free simply connected zone, is limited by a ring-shaped onset line of the ring-shaped structure.

[0039] An x,y position preferably is defined in an x,y,z coordinate system, the x,y,z coordinate system preferably is defined as follows: A predefined point of the spectacle lens defines an origin of the x,y,z coordinate system and i) a surface normal or ii) a primary direction at said predefined point defines a z direction. An x,y direction is in a plane perpendicular to said surface normal or said primary direction. In said plane perpendicular to said surface normal or said primary direction an x direction and a y direction are perpendicular to each other. Said predefined point preferably is selected from the group consisting of the optical centre of the spectacle lens and the fitting point of the spectacle lens. The primary direction of the spectacle lens is as defined in ISO 13666:2019(E), entry 3.2.25, a direction of a line of sight (3.2.24), usually taken to be a horizontal, to an object at an infinite distance measured with habitual head and body posture when looking straight ahead in unaided vision.

[0040] The “optical centre” of the spectacle lens is as defined in ISO 13666:2019(E), entry 3.2.15, an intersection of an optical axis (3.1.8) with a front surface (3.2.13) of the spectacle lens (3.5.2).

[0041] The “fitting point” of the spectacle lens is as defined in ISO 13666:2019(E), entry 3.2.34, a point on a front surface (3.2.13) of the spectacle lens (3.5.2) stipulated by a manufacturer for positioning the spectacle lens in front of an eye.

[0042] According to note 1 to entry 3.2.30 (centration point) of 13666:2019(E), the optical centre (3.2.15) usually applies to the single-vision spectacle lens (3.7.1), the fitting point (3.2.34) usually to the position-specific single-vision spectacle lens (3.7.2). Further, according to ISO 8980-1 :2017(E), entry 7.1 , position-specific single-vision spectacle lenses shall have permanent alignment reference marking comprising two marks located nominally 34 mm apart, equidistant to a vertical plane through the fitting point.

[0043] With respect to the simply connected zone, in particular with respect to the structure-free simply connected zone comprising the optical centre or the fitting point of the spectacle lens, a “ring-shaped” onset line of the ring-shaped structure is an onset line that, beginning in a point, surrounds or encircles the structure-free simply connected zone and ends in said point again.

[0044] With respect to the simply connected zone, in particular with respect to the structure-free simply connected zone comprising the optical centre or the fitting point of the spectacle lens, a ring-shaped “onset line” of the ring-shaped structure passes along each onset of the ring-shaped structure. Each onset of said ring-shaped structure represents or is, along a perimeter of the simply connected zone, i.e. the structure-free simply connected zone, i) a first position along any line from the optical centre of the spectacle lens towards a periphery of the spectacle lens in which a surface of said ring-shaped structure differs from a surface of the spectacle lens comprising said ring-shaped structure or ii) a first position along any line from the fitting point of the spectacle lens towards the periphery of the spectacle lens in which a surface of said ring-shaped structure differs from a surface of the spectacle lens comprising said ring-shaped structure. The surface of the ring-shaped structure differs from the surface of the spectacle lens comprising said ring-shaped structure in the surface power. Additionally, the surface of the ring-shaped structure may differ from the surface of the spectacle lens comprising said ring-shaped structure in the luminous transmittance. That, along any line from the optical centre of the spectacle lens towards the periphery of the spectacle lens, the surface of the ring-shaped structure differs in the first position in the surface power from the surface of the spectacle lens comprising said ring-shaped structure, preferably means that, along any line from the optical centre of the spectacle lens towards the periphery of the spectacle lens, a surface power gradient in said first position is above a predefined threshold for surface power gradient. Preferably, said predefined threshold for surface power gradient is equal to or larger than 0.75 dioptres / mm. That, along any line from the fitting point of the spectacle lens towards the periphery of the spectacle lens, the surface of the ring-shaped structure differs in the first position in the surface power from the surface of the spectacle lens comprising said ring-shaped structure, preferably means that, along any line from the fitting point of the spectacle lens towards the periphery of the spectacle lens, the surface power gradient in the said first position is above a predefined threshold for surface power gradient. Preferably, said predefined threshold for surface power gradient is equal to or larger than 0.75 dioptres / mm.

[0045] That, along any line from the optical centre of the spectacle lens towards the periphery of the spectacle lens, the surface of the ring-shaped structure differs in the first position in the surface power from the surface of the spectacle lens comprising said ring-shaped structure more preferably means that the surface power is discontinuous in said first position along a respective line from the optical centre of the spectacle lens towards the periphery of the spectacle lens. In other words, that, along any line from the optical centre of the spectacle lens towards the periphery of the spectacle lens, the surface of the ring-shaped structure differs in the first position in surface power from the surface of the spectacle lens comprising said ring-shaped structure, more preferably means that the surface power is discontinuous in said first position along a respective line from the optical centre of the spectacle lens towards the periphery of the spectacle lens.

[0046] That, along any line from the fitting point of the spectacle lens towards the periphery of the spectacle lens, the surface of the ring-shaped structure differs in the first position in the surface power from the surface of the spectacle lens comprising said ring-shaped structure more preferably means that the surface power is discontinuous in said first position along a respective line from the fitting point of the spectacle lens towards the periphery of the spectacle lens. In other words, that, along any line from the fitting point of the spectacle lens towards the periphery of the spectacle lens, the surface of the ring-shaped structure differs in the first position in surface power from the surface of the spectacle lens comprising said ring-shaped structure, more preferably means that the surface power is discontinuous in said first position along a respective line from the fitting point of the spectacle lens towards the periphery of the spectacle lens. The ring-shaped onset line has a centroid. This means that the simply connected zone, i.e. the structure-free simply connected zone, has said same centroid. Said centroid may coincide with the optical centre of the spectacle lens or with the fitting point of the spectacle lens.

[0047] The ring-shaped onset line has a maximal distance to the centroid of the ring-shaped onset line, a minimal distance to the centroid of the ring-shaped onset line and a mean distance to the centroid of the ring-shaped onset line. The maximal distance, the minimal distance and the mean distance are mutually different. The maximal distance of the ring-shaped onset line to the centroid of the ringshaped onset line is determined as a distance between an onset of said ring-shaped onset line furthest away from said centroid and said centroid. The minimal distance of the ring-shaped onset line to the centroid of the ring-shaped onset line is determined as a distance between an onset of said ring-shaped onset line closest neighbouring said centroid and said centroid. The mean distance of the ring-shaped onset line to the centroid of the ring-shaped onset line is determined as a distance halfway between said maximal distance and said minimal distance.

[0048] A ratio between said maximal distance of said ring-shaped onset line to said centroid of said ringshaped onset line and said minimal distance of said ring-shaped onset line to said centroid of said ring-shaped onset line is above a predefined threshold.

[0049] Said predefined threshold is selected from at least one of the following threshold values:

[0050] - the ratio of said maximal distance to said minimal distance is above the predefined threshold of 2.0,

[0051] - the ratio of said maximal distance to said minimal distance is above the predefined threshold of 2.1 ,

[0052] - the ratio of said maximal distance to said minimal distance is above the predefined threshold of 2.2,

[0053] - the ratio of said maximal distance to said minimal distance is above the predefined threshold of 2.3.

[0054] The ratio between said maximal distance to said minimal distance being above any one of the before mentioned predefined thresholds ensures that the alternating minimal and maximal distances of the ring-shaped onset line of the ring-shaped structure combine an increased probable efficacy of the spectacle lens in terms of reduction of progression of myopia with a comfort of wearability. That means, in positions in which the simply connected zone, i.e. the structure-free simply connected zone, is limited by the ring-shaped onset line of the ring-shaped structure having the minimal distance to the centroid of the ring-shaped onset line, the probable efficacy of the spectacle lens in terms of reduction of progression of myopia is provided. This also means that in positions in which the simply connected zone, i.e. the structure-free simply connected zone, is limited by the ring-shaped onset line of the ringshaped structure having the maximal distance to the centroid of the ring-shaped onset line, the comfort of wearability is given and thus the acceptance of the spectacle lens ensured.

[0055] A “reference circle” is an imaginary circle centred at the centroid of the ring-shaped onset line. The radius of the reference circle is equal to the mean distance of the ring-shaped onset line to the centroid of the ring-shaped onset line. The reference circle intersects more than eight times in mutually different positions the ring-shaped onset line.

[0056] Preferably, the reference circle intersects in mutually different positions the ring-shaped onset line

[0057] - more than eight times and less than seventy-three times - ten times

[0058] - more than ten times and less than thirty-seven times

[0059] - twelve times

[0060] - more than twelve times and less than twenty-one times.

[0061] Compared to the disclosure of TW 201939117 A, disclosing the star-shaped clear zone having its largest dimensions in horizontal and vertical direction, the structure-free simply connected zone limited by the ring-shaped onset line that has, in mutually different positions, more than eight intersections with the reference circle ensures, for example, when the spectacle lens wearer is looking through said structure-free simply connected zone at an object, that more parts of said object are perceived in clear vision. In other words, when the spectacle lens wearer is looking at said object through said structure- free simply connected zone that has been calculated to provide the ordered power for correcting the wearer's vision, the spectacle lens wearer recognizes more parts of said object in clear vision compared to the star-shaped clear zone disclosed in TW 201939117 A. This means, the spectacle lens wearer will be better able to recognize said object fixated through said structure-free simply connected zone.

[0062] Preferably, the spectacle lens comprising the ring-shaped structure and the structure-free simply connected zone, said structure-free simply connected zone comprising the optical centre of the spectacle lens or the fitting point of the spectacle lens, said structure-free simply connected zone being limited by the ring-shaped onset line of said ring-shaped structure, said ring-shaped onset line of said ring-shaped structure having the maximal distance to the centroid of said ring-shaped onset line, the minimal distance to said centroid of said ring-shaped onset line, and the mean distance to said centroid of said ring-shaped onset line, the spectacle lens is characterized in that said structure-free simply connected zone has a surface area within at least one range of the group consisting of

[0063] - a range of 22 mm2to 80 mm2

[0064] - a range of 24 mm2to 75 mm2

[0065] - a range of 26 mm2to 70 mm2

[0066] - a range of 28 mm2to 65 mm2

[0067] - a range of 30 mm2to 60 mm2.

[0068] WO 2023 / 156052 A1 discloses that a central clear zone surrounded by, for example, a plurality of ring-shaped structures has a central zone width in a range of 6 mm to 9.4 mm. The central clear zone is shown circular-shaped in the figures of WO 2023 / 156052 A1 . According to WO 2023 / 156052 A1 , the smaller central zone width is assumed to increase a probable efficacy of such a spectacle lens for a reduction of progression of myopia of the spectacle lens wearer. However, the smaller central zone width decreases an acceptance of the spectacle lens by the spectacle lens wearer for comfortability reasons. The larger central zone width decreases the probable efficacy of the spectacle lens, whereas at the same time the larger clear zone increases the acceptance of the spectacle lens by the spectacle lens wearer due to the increased comfort of wearability of the spectacle lens. The central zone with the central zone width in the range of 6 mm to 9.4 mm occupies the surface area in the range of 28 mm2to 70 mm2.

[0069] The simply connected zone, i.e. the structure-free simply connected zone, that is limited along any line from i) the optical centre towards the periphery of the spectacle lens or ii) the fitting point towards the periphery of the spectacle lens by the by the ring-shaped onset line of the ring-shaped structure, said ring-shaped onset line having the more than eight intersections with the reference circle, means in other words that the structure-free simply connected zone is formed not circular-shaped. The structure-free simply connected zone is limited by the ring-shaped onset line of the ring-shaped structure that has the minimal distance and the maximal distance to the centroid of the structure-free simply connected zone. Nevertheless, the surface area of the structure-free simply connected zone preferably is in a similar range as the surface area occupied by the central clear zone according to WO 2023 / 156052 A1 to ensure wearability of the spectacle lens. At the same time, the alternating minimal and maximal distances of the ring-shaped onset line of the ring-shaped structure combine in the structure-free simply connected zone, i.e. within a single zone, the advantages listed before with respect to the central clear zone described in WO 2023 / 156052 A1 . That means, in positions in which the structure-free simply connected zone is limited by the ring-shaped onset line of the ring-shaped structure having the minimal distance to the centroid of the ring-shaped onset line, the probable efficacy of the spectacle lens in terms of reduction of progression of myopia is provided. This also means that in positions in which the structure-free simply connected zone is limited by the ring-shaped onset line of the ring-shaped structure having the maximal distance to the centroid of the ring-shaped onset line, the comfort of wearability is given and thus the acceptance of the spectacle lens ensured.

[0070] Preferably, the spectacle lens comprising the ring-shaped structure and the structure-free simply connected zone, said structure-free simply connected zone comprising the optical centre of the spectacle lens or the fitting point of the spectacle lens, said structure-free simply connected zone being limited by the ring-shaped onset line of said ring-shaped structure, said ring-shaped onset line of said ring-shaped structure having the maximal distance to the centroid of said ring-shaped onset line, the minimal distance to said centroid of said ring-shaped onset line, and the mean distance to said centroid of said ring-shaped onset line, the spectacle lens is characterized in that said minimal distance of said ring-shaped onset line to said centroid of said ring-shaped onset line is within at least one range of the group consisting of

[0071] - a range of 1 mm to 8 mm

[0072] - a range of 1 .5 mm to 7 mm

[0073] - a range of 2 mm to 6 mm

[0074] - a range of 2.5 mm to 5 mm.

[0075] Predetermining said minimal distance of said centroid of said ring-shaped structure to said ringshaped structure in one of the above-mentioned ranges ensures an increased probable efficacy for the reduction of myopia progression for the spectacle lens wearer. Preferably, the spectacle lens comprising the ring-shaped structure and the structure-free simply connected zone, said structure-free simply connected zone comprising the optical centre of the spectacle lens or the fitting point of the spectacle lens, said structure-free simply connected zone being limited by the ring-shaped onset line of said ring-shaped structure, said ring-shaped onset line of said ring-shaped structure having the maximal distance to the centroid of said ring-shaped onset line, the minimal distance to said centroid of said ring-shaped onset line, and the mean distance to said centroid of said ring-shaped onset line, the spectacle lens is characterized in comprising a plurality of structure-free simply connected zones, each structure-free simply connected zone of said plurality of structure-free simply connected zones a) being limited by a ring-shaped onset line of a ring-shaped structure and b) having no intersection with said structure-free simply connected zone comprising the optical centre of the spectacle lens or the fitting point of the spectacle lens.

[0076] Each simply connected zone of said plurality of simply connected zones is limited by a ring-shaped onset line of a ring-shaped structure. For each simply connected zone of said plurality of simply connected zones the ring-shaped onset line passes along each onset of a respective ring-shaped structure. Each onset of the respective ring-shaped structure represents, along a perimeter of the respective simply connected zone of said plurality of simply connected zones, a first position along any line from a centroid of the respective simply connected zone towards a periphery of the respective simply connected zone in which a surface of the respective ring-shaped structure differs from the surface of the spectacle lens comprising the respective ring-shaped structure. The surface of the respective ring-shaped structure differs from the surface of the spectacle lens comprising the respective ring-shaped structure in at least one of the surface power and the luminous transmittance. Each simply connected zone of said plurality of simply connected zones is structure-free, i.e., each simply connected zone of said plurality of simply connected zones does not comprise any structure. In other words, a respective structure-free simply connected zone of said plurality of structure-free simply connected zones is a respective domain of the spectacle lens comprising each x,y position that is comprised in said respective structure-free simply connected zone of said plurality of structure-free simply connected zones of both the front surface and the back surface of the spectacle lens. With respect to the respective structure-free simply connected zone of the plurality of structure-free simply connected zones, a respective ring-shaped onset line of the respective structure-free simply connected zone of the plurality of structure-free simply connected zones is an onset line that, beginning in a point, surrounds or encircles the respective structure-free simply connected zone of said plurality of structure-free simply connected zones and ends in said point again. With respect to the respective structure-free simply connected zone of the plurality of structure-free simply connected zones, the respective ring-shaped onset line of the respective structure-free simply connected zone of the plurality of structure-free simply connected zones passes each onset of the respective structure- free simply connected zone of the plurality of structure-free simply connected zones. Each onset of the respective ring-shaped onset line of the respective structure-free simply connected zone of the plurality of structure-free simply connected zones represents or is, along a perimeter of the respective structure-free simply connected zone of the plurality of structure-free simply connected zones, a first position that, along any line from a respective centroid of the respective structure-free simply connected zone of the plurality of structure-free simply connected zones towards the respective ringshaped onset line limiting the respective structure-free simply connected zone of the plurality of structure-free simply connected zones, differs, preferably in surface power, from the surface of the spectacle lens comprising the respective structure-free simply connected zone of the plurality of structure-free simply connected zones. That, along any line from the respective centroid of the respective structure-free simply connected zone of the plurality of structure-free simply connected zones towards the respective ring-shaped onset line limiting the respective structure-free simply connected zone of the plurality of structure-free simply connected zones, a surface of the respective ring-shaped structure limiting the respective structure-free simply connected zone of the plurality of structure-free simply connected zones differs in the first position, preferably in surface power, from the surface of the spectacle lens comprising the respective ring-shaped structure preferably means that, along any line from the respective centroid of the respective structure-free simply connected zone of the plurality of structure-free simply connected zones towards the respective ring-shaped onset line limiting the respective structure-free simply connected zone of the plurality of structure-free simply connected zones, the surface power gradient in said first position is above a predefined threshold for surface power gradient. Preferably, said predefined threshold for surface power gradient is equal to or larger than 0.75 dioptres / mm. That, along any line from the respective centroid of the respective structure-free simply connected zone of the plurality of structure-free simply connected zones towards the respective ring-shaped onset line limiting the respective structure-free simply connected zone of the plurality of structure-free simply connected zones, the surface of the respective ring-shaped structure differs in the first position, preferably in surface power, from the surface of the spectacle lens comprising the respective structure-free simply connected zone of the plurality of structure-free simply connected zones more preferably means that the surface power is discontinuous in said first position along a respective line from the respective centroid of the respective structure-free simply connected zone of the plurality of structure-free simply connected zones towards the respective ring-shaped onset line limiting the respective structure-free simply connected zone of the plurality of structure-free simply connected zones.

[0077] Preferably, each simply connected zone of said plurality of simply connected zones, i.e., each structure-free simply connected zone of said plurality of structure-free simply connected zones, has a convexity below 1. With respect to each simply connected zone of said plurality of simply connected zones, i.e., with respect to each structure-free simply connected zone of said plurality of structure-free simply connected zones, convexity is defined as ratio of a perimeter of a convex hull of the respective ring-shaped onset line of the respective ring-shaped structure to a perimeter of the respective ringshaped onset line of the respective ring-shaped structure. In other words, convexity is a ratio of a perimeter of a convex hull of the respective structure-free simply connected zone of said plurality of structure-free simply connected zones to a perimeter of the respective structure-free simply connected zone of said plurality of structure-free simply connected zones. By the way, the definition of convexity given before with respect to each structure-free simply connected zone of the plurality of structure-free simply connected zones preferably applies for the structure-free simply connected zone comprising the optical centre or the fitting point of the spectacle lens as well. Preferably, each structure-free simply connected zone of said plurality of structure-free simply connected zones has a similar symmetry as the structure-free simply connected zone that comprises the optical centre of the spectacle lens or the fitting point of the spectacle lens. A symmetry of a structure-free simply connected zone of said plurality of structure-free simply connected zones is similar to a symmetry of the structure-free simply connected zone that comprises the optical centre of the spectacle lens or the fitting point of the spectacle lens when a number of intersections of a respective reference circle with the respective ring-shaped onset line of the respective ring-shaped structure is identical. Each structure-free simply connected zone of said plurality of structure-free simply connected zones has a centroid. Each structure-free simply connected zone of said plurality of structure-free simply connected zones has a minimal distance and a maximal distance between a respective centroid and a respective onset line of a respective ring-shaped structure limiting a respective structure-free simply connected zone of said plurality of structure-free simply connected zones. For each structure-free simply connected zone of said plurality of structure-free simply connected zones a respective mean distance is halfway between the respective maximal distance and the respective minimal distance. The respective mean distance is a respective radius for the respective reference circle around the respective centroid of the respective simply connected zone of said plurality of simply connected zones.

[0078] Preferably, each structure-free simply connected zone of said plurality of structure-free simply connected zones does not comprise the optical centre of the spectacle lens or the fitting point of the spectacle lens.

[0079] Each structure-free simply connected zone of the plurality of structure-free simply connected zones does have no intersection with the structure-free simply connected zone that comprises the optical centre or the fitting point of the spectacle lens.

[0080] In case of a roving eye, the plurality of structure-free simply connected zones allow clear vision through each structure-free simply connected zone of said plurality of structure-free simply connected zones towards peripheral objects since the spectacle lens is calculated to provide the ordered power for correcting the wearer’s vision.

[0081] Preferably, the spectacle lens comprising the ring-shaped structure and the structure-free simply connected zone, said structure-free simply connected zone comprising the optical centre of the spectacle lens or the fitting point of the spectacle lens, said structure-free simply connected zone being limited by the ring-shaped onset line of said ring-shaped structure, said ring-shaped onset line of said ring-shaped structure having the maximal distance to the centroid of said ring-shaped onset line, the minimal distance to said centroid of said ring-shaped onset line, and the mean distance to said centroid of said ring-shaped onset line, the spectacle lens is characterized in that each structure-free simply connected zone of the plurality of structure-free simply connected zones has a convexity below 1.

[0082] As mentioned before, in case of a roving eye, the plurality of structure-free simply connected zones allow clear vision through each structure-free simply connected zone of said plurality of structure-free simply connected zones towards peripheral objects since the spectacle lens is calculated to provide the ordered power for correcting the wearer’s vision. Due to the convexity of below 1 for each structure-free simply connected zone of the plurality of structure-free simply connected zones, the beneficial effect described with respect to the structure-free simply connected zone comprising the optical centre or the fitting point of the spectacle lens is assumed to be applicable for each structure- free simply connected zone of said plurality of structure-free simply connected zones as well.

[0083] Preferably, the spectacle lens comprising the ring-shaped structure and the structure-free simply connected zone, said structure-free simply connected zone comprising the optical centre of the spectacle lens or the fitting point of the spectacle lens, said structure-free simply connected zone being limited by the ring-shaped onset line of said ring-shaped structure, said ring-shaped onset line of said ring-shaped structure having the maximal distance to the centroid of said ring-shaped onset line, the minimal distance to said centroid of said ring-shaped onset line, and the mean distance to said centroid of said ring-shaped onset line, the spectacle lens is characterized in that a respective reference circle centred at a respective centroid of a respective structure-free simply connected zone of said plurality of structure-free simply connected zones has a number of intersections with said respective ring-shaped onset line of said respective ring-shaped structure limiting each respective structure-free simply connected zone of said plurality of structure-free simply connected zones, said number of intersections with said respective ring-shaped onset line of said respective ring-shaped structure limiting each respective structure-free simply connected zone of said plurality of structure- free simply connected zones being identical to a number of intersections of said reference circle centred at said centroid of said ring-shaped onset line of said structure-free simply connected zone comprising said optical centre of said spectacle lens or said fitting point of said spectacle lens, said respective ring-shaped onset line of said respective ring-shaped structure limiting each respective structure-free simply connected zone of said plurality of simply connected zones has a minimum distance to said respective centroid of said respective structure-free simply connected zone of said plurality of structure-free simply connected zones, a maximum distance to said respective centroid of said respective structure-free simply connected zone of said plurality of structure-free simply connected zones and a mean distance to said respective centroid of said respective structure-free simply connected zone of said plurality of structure-free simply connected zones, said respective reference circle is centred at said respective centroid of said respective structure-free simply connected zone of said plurality of structure-free simply connected zones, said respective reference circle has a radius equal to said respective mean distance.

[0084] Additionally to the before said with respect to clear vision allowed through each structure-free simply connected zone of said plurality of structure-free simply connected zones and the beneficial effect due to the convexity below 1 for each structure-free simply connected zone of said plurality of structure- free simply connected zones, each structure-free simply connected zone of said plurality of structure- free simply connected zones contributes to an aesthetically pleasing impression of the spectacle lens due to uniform shaping of the structure-free simply connected zones, irrespective of whether being the structure-free simply connected zone comprising the optical centre or the fitting point of the spectacle lens or being any structure-free simply connected zone of the plurality of structure-free simply connected zones.

[0085] Preferably, the spectacle lens comprising the ring-shaped structure and the structure-free simply connected zone, said structure-free simply connected zone comprising the optical centre of the spectacle lens or the fitting point of the spectacle lens, said structure-free simply connected zone being limited by the ring-shaped onset line of said ring-shaped structure, said ring-shaped onset line of said ring-shaped structure having the maximal distance to the centroid of said ring-shaped onset line, the minimal distance to said centroid of said ring-shaped onset line, and the mean distance to said centroid of said ring-shaped onset line, the spectacle lens is characterized in that a ratio of said maximal distance to said minimal distance of said respective centroid to said respective ring-shaped onset line of said respective ring-shaped structure limiting each structure-free simply connected zone of said plurality of simply connected zones is identical to said ratio between said maximal distance to said minimal distance of said ring-shaped onset line of said ring-shaped structure limiting said structure-free simply connected zone comprising said optical centre of the spectacle lens or said fitting point of said spectacle lens.

[0086] Again, additionally to the before said with respect to clear vision allowed through each structure-free simply connected zone of said plurality of structure-free simply connected zones and the beneficial effect due to the convexity below 1 for each structure-free simply connected zone of said plurality of structure-free simply connected zones, each structure-free simply connected zone of said plurality of structure-free simply connected zones contributes to an aesthetically pleasing impression of the spectacle lens due to uniform shaping of the structure-free simply connected zones, irrespective of whether being the structure-free simply connected zone comprising the optical centre or the fitting point of the spectacle lens or being any structure-free simply connected zone of the plurality of structure-free simply connected zones.

[0087] The spectacle lens comprises i) a ring-shaped structure and ii) a connected zone, said spectacle lens comprises an optical centre of the spectacle lens or a fitting point of the spectacle lens, said optical centre being defined as in ISO 13666:2019(E), entry 3.2.15, said fitting point being as defined in ISO 13666:2019(E), entry 3.2.34, said connected zone is limited in any direction towards a periphery of said spectacle lens by a ringshaped onset line of said ring-shaped structure, said ring-shaped onset line of said ring-shaped structure has a convexity of below 1 , the spectacle lens is characterized in that said connected zone surrounds said optical centre or said fitting point, and a projection of a perifoveal visual field onto a surface of the spectacle lens is having at least one intersection with said ring-shaped onset line of said ring-shaped structure, said perifoveal visual field is having an apex angle aPerifovea in a range of 17.5° to 18.5°, said projection of said perifoveal visual field being defined with respect to

[0088] A) an eye model comprising

[0089] - an optical axis of an eye,

[0090] - a distance from a pupil plane of said eye to an apex of a cornea of said eye along said optical axis, said distance being 2 mm,

[0091] - said perifoveal visual field being defined by a right circular double cone Cperifo ea with an axis coinciding with said optical axis, an apex of said right circular double cone Cperifovea being located at an intersection of said optical axis with said pupil plane having said apex angle aperifovea, said apex angle Qperifovea being identical for said perifoveal visual field and said right circular double COne Cperifovea, and

[0092] B) an as-worn position as defined in ISO 13666:2019(E), entry 3.2.36, comprising

[0093] - a vertex distance as defined in ISO 13666:2019(E), entry 3.2.40, said vertex distance being

[0094] 12 mm,

[0095] - a primary direction as defined in ISO 13666:2019(E), entry 3.2.25,

[0096] - an as-worn pantoscopic angle as defined in ISO 13666:2019(E), entry 3.2.37, said as-worn pantoscopic angle being 0°,

[0097] - an as-worn face form angle as defined in ISO 13666:2019(E), entry 3.2.38, said as-worn face form angle being 0°.

[0098] In particular, the spectacle lens comprises i) a ring-shaped structure and ii) a connected zone, said spectacle lens comprises an optical centre of the spectacle lens or a fitting point of the spectacle lens, said optical centre being defined as in ISO 13666:2019(E), entry 3.2.15, said fitting point being as defined in ISO 13666:2019(E), entry 3.2.34, said connected zone is limited in any direction towards a periphery of said spectacle lens by a ringshaped onset line of said ring-shaped structure, said ring-shaped onset line of said ring-shaped structure passes along each onset of said ring-shaped structure, each onset of said ring-shaped structure is, along a perimeter of said connected zone, i) a first position along any line from said optical centre of said spectacle lens towards a periphery of said spectacle lens in which a surface of said ring-shaped structure differs in surface power from a surface of said spectacle lens comprising said ring-shaped structure or ii) a first position along any line from said fitting point of said spectacle lens towards a periphery of said spectacle lens in which a surface of said ring-shaped structure differs in surface power from a surface of said spectacle lens comprising said ring-shaped structure, said ring-shaped onset line of said ring-shaped structure has a convexity of below 1 , the spectacle lens is characterized in that said connected zone surrounds said optical centre or said fitting point, and a projection of a perifoveal visual field onto a surface of the spectacle lens is having at least one intersection with said ring-shaped onset line of said ring-shaped structure, said perifoveal visual field is having an apex angle aPerifovea in a range of 17.5° to 18.5°, said projection of said perifoveal visual field being defined with respect to

[0099] A) an eye model comprising

[0100] - an optical axis of an eye,

[0101] - a distance from a pupil plane of said eye to an apex of a cornea of said eye along said optical axis, said distance being 2 mm,

[0102] - said perifoveal visual field being defined by a right circular double cone Cperifovea with an axis coinciding with said optical axis, an apex of said right circular double cone Cperifovea being located at an intersection of said optical axis with said pupil plane having said apex angle aPerifovea, said apex angle Qperifovea being identical for said perifoveal visual field and said right circular double COne Cperifovea, and

[0103] B) an as-worn position as defined in ISO 13666:2019(E), entry 3.2.36, comprising

[0104] - a vertex distance as defined in ISO 13666:2019(E), entry 3.2.40, said vertex distance being 12 mm,

[0105] - a primary direction as defined in ISO 13666:2019(E), entry 3.2.25,

[0106] - an as-worn pantoscopic angle as defined in ISO 13666:2019(E), entry 3.2.37, said as-worn pantoscopic angle being 0°,

[0107] - an as-worn face form angle as defined in ISO 13666:2019(E), entry 3.2.38, said as-worn face form angle being 0°.

[0108] A “connected zone” is a domain of a spectacle lens, said domain cannot be split up into two or a plurality of independent, not connected zones. Preferably, the connected zone is the domain on the surface of the spectacle lens, said domain cannot be split up into two or a plurality of independent, not connected zones. Preferably, the connected zone is structure-free, i.e., the connected zone does not comprise any structure. In other words, a structure-free connected zone of the spectacle lens preferably is calculated to provide an ordered power for correcting a wearer's vision. Thus, the structure-free connected zone of the spectacle lens is a domain of the spectacle lens comprising each x,y position that is comprised in said structure-free connected zone of both the front surface and the back surface of the spectacle lens.

[0109] If necessary, the connected zone needs to be reconstructed between parts of the connected zone still comprised in an edged spectacle lens, the edged spectacle lens as defined in ISO 13666:2019(E), entry 3.8.9.

[0110] The connected zone “surrounds” or encircles the optical centre of the spectacle lens or the fitting point of the spectacle lens, meaning there is a path within the connected zone that surrounds or encircles said optical centre or said fitting point, said path begins in a point within the connected zone and ends in said point again.

[0111] The connected zone has a convexity below 1 , i.e., the connected zone is not circular. The connected zone is limited in any direction towards a periphery of the spectacle lens, preferably i) from the optical centre of the spectacle lens in any direction towards the periphery of the spectacle lens or ii) the fitting point of the spectacle lens in any direction towards the periphery of the spectacle lens, by a ringshaped onset line of the ring-shaped structure, said ring-shaped onset line of said ring-shaped structure has said convexity of said connected zone below 1 , i.e., said ring-shaped onset line of said ring-shaped structure limiting said connected zone in any direction towards the periphery of the spectacle lens, preferably i) from the optical centre of the spectacle lens or ii) from the fitting point of the spectacle lens in any direction towards the periphery of the spectacle lens is not circular.

[0112] Preferably in case the connected zone is structure-free, preferably the connected zone has a surface area within one of the following ranges:

[0113] - a range of 22 mm2to 80 mm2

[0114] - a range of 24 mm2 to 75 mm2

[0115] - a range of 26 mm2 to 70 mm2

[0116] - a range of 28 mm2 to 65 mm2

[0117] - a range of 30 mm2 to 60 mm2.

[0118] The reasons for these ranges are as explained before with respect to the structure-free simply connected zone.

[0119] With respect to the connected zone, the “ring-shaped” onset line of the ring-shaped structure is an onset line that, beginning in a point, surrounds or encircles the connected zone and ends in said point again.

[0120] With respect to the connected zone, the ring-shaped “onset line” of the ring-shaped structure passes along each onset of the ring-shaped structure. Each onset of said ring-shaped structure represents, along an outer perimeter of the connected zone, i) a first position along any line from the optical centre of the spectacle lens towards the periphery of the spectacle lens in which a surface of said ringshaped structure differs from a surface of the spectacle lens comprising said ring-shaped structure or ii) a first position along any line from the fitting point of the spectacle lens towards the periphery of the spectacle lens in which a surface of said ring-shaped structure differs from a surface of the spectacle lens comprising said ring-shaped structure. The surface of the ring-shaped structure differs from the surface of the spectacle lens comprising said ring-shaped structure in the surface power. Additionally, the surface of the ring-shaped structure may differ from the surface of the spectacle lens in the luminous transmittance. In case the connected zone is structure-free or in case any structures within the connected zone are disregarded: That, along any line from the optical centre of the spectacle lens towards the periphery of the spectacle lens, the surface of the ring-shaped structure differs in the first position in the surface power from the surface of the spectacle lens comprising said ring-shaped structure, preferably means that, along any line from the optical centre of the spectacle lens towards the periphery of the spectacle lens, a surface power gradient in said first position is above a predefined threshold for surface power gradient. Preferably, said predefined threshold for surface power gradient is equal to or larger than 0.75 dioptres / mm. That, along any line from the fitting point of the spectacle lens towards the periphery of the spectacle lens, the surface of the ring-shaped structure differs in the first position in the surface power from the surface of the spectacle lens comprising said ring-shaped structure, preferably means that, along any line from the fitting point of the spectacle lens towards the periphery of the spectacle lens, the surface power gradient in the said first position is above a predefined threshold for surface power gradient. Preferably, said predefined threshold for surface power gradient is equal to or larger than 0.75 dioptres / mm.

[0121] That, along any line from the optical centre of the spectacle lens towards the periphery of the spectacle lens, the surface of the ring-shaped structure differs in the first position in the surface power from the surface of the spectacle lens comprising said ring-shaped structure more preferably means that the surface power is discontinuous in said first position along a respective line from the optical centre of the spectacle lens towards the periphery of the spectacle lens. In other words, that, along any line from the optical centre of the spectacle lens towards the periphery of the spectacle lens, the surface of the ring-shaped structure differs in the first position in surface power from the surface of the spectacle lens comprising said ring-shaped structure, more preferably means that the surface power is discontinuous in said first position along a respective line from the optical centre of the spectacle lens towards the periphery of the spectacle lens.

[0122] That, along any line from the fitting point of the spectacle lens towards the periphery of the spectacle lens, the surface of the ring-shaped structure differs in the first position in the surface power from the surface of the spectacle lens comprising said ring-shaped structure more preferably means that the surface power is discontinuous in said first position along a respective line from the fitting point of the spectacle lens towards the periphery of the spectacle lens. In other words, that, along any line from the fitting point of the spectacle lens towards the periphery of the spectacle lens, the surface of the ring-shaped structure differs in the first position in surface power from the surface of the spectacle lens comprising said ring-shaped structure, more preferably means that the surface power is discontinuous in said first position along a respective line from the fitting point of the spectacle lens towards the periphery of the spectacle lens.

[0123] The ring-shaped onset line of the ring-shaped structure that is limiting the connected zone in any direction towards the periphery of the spectacle lens, preferably from the optical centre of the spectacle lens in any direction towards the periphery of the spectacle lens or from the fitting point of the spectacle lens in any direction towards the periphery of the spectacle lens, a) has a convexity below 1 , i.e., said ring-shaped onset line of the ring-shaped structure is not circular, b) surrounds or encircles the optical centre of the spectacle lens or the fitting point of the spectacle lens, c) has at least one intersection with a projection of a perifoveal visual field onto a surface of said spectacle lens, said perifoveal visual field having an apex angle aperifovea in a range of 17.5° to 18.5°.

[0124] With respect to the connected zone, “convexity” is defined as ratio of a perimeter of a convex hull of the ring-shaped onset line of the ring-shaped structure to a perimeter of said ring-shaped onset line of said ring-shaped structure. In other words, convexity is a ratio of a convex hull of the connected zone to a perimeter of the connected zone: perimeter convex hull (ring — shaped onset line or connected zone') convexity = - - - - - ■ - - - ■ - - - perimeter (ring — shaped onset line or connected zone)

[0125] Preferably, the convexity of the ring-shaped onset line of the ring-shaped structure or the connected zone, respectively, is selected from at least one of the following values:

[0126] - the convexity being below 0.9,

[0127] - the convexity being below 0.8,

[0128] - the convexity being below 0.75,

[0129] - the convexity being below 0.7.

[0130] With respect to the connected zone, the “convex hull” of the ring-shaped onset line of the ring-shaped structure is a smallest convex shape that contains the ring-shaped onset line of the ring-shaped structure. In other words, the convex hull of the connected zone is a smallest convex shape that contains the connected zone.

[0131] A “projection of a perifoveal visual field" onto the surface of the spectacle lens is a closed curve along said surface corresponding to a visual angle behind the spectacle lens associated with said perifoveal visual field and corresponding to an apex angle aperifovea of a right circular double cone Cperifovea.

[0132] The projection of said perifoveal visual field defined by the right circular double cone Cperifovea onto the back surface of the spectacle lens is an intersection line of said right circular double cone Cperifovea with said back surface. The projection of said perifoveal visual field defined by the right circular double cone Cperifovea on the front surface of said spectacle lens, i.e., on the front surface of a same spectacle lens, is calculated by ray-tracing a sufficiently large number of rays lying in a lateral surface of said right circular double cone Cperifovea through said spectacle lens and thus calculating intersection points of said large number of rays with said front surface of said spectacle lens. Each ray is traced from an apex of said right circular double cone Cperifovea to its intersection point with the back surface of said spectacle lens and in an optically correct way further to its intersection point with said front surface of said same spectacle lens. Said projection onto said front surface is then a closed curve fitted to said intersection points of said large number of rays. Here, fitting a closed curved to said intersection points of said large number of rays can for example be done by linearly connecting said intersection points, by fitting a spline through said intersection points, or, in case of a rotationally symmetric spectacle lens, by fitting a circle or an ellipse through said intersection points.

[0133] For a spherical spectacle lens and an assumed as-worn position such that an optical axis of the spectacle lens and the optical axis of the eye coincide, the projections of a right circular double cone Cperifovea onto the back surface and the front surface of the spectacle lens are circles. In this case, tracing only one ray from the apex of the right circular double cone Cperifovea along the lateral surface of the right circular double cone Cperifovea and further through the spectacle lens may be sufficient to define the radius of the projection circle of said right circular double cone Cperifovea onto the front surface of the spectacle lens. For a spectacle lens with one surface or both surfaces, i.e., the front surface and the back surface, being not a spherical surface, a number of 36, 72, 144 or 360 rays equidistant along the lateral surface of said right circular double cone Cperifovea might be considered sufficient, depending on the intended accuracy.

[0134] A “perifoveal visual field” is an area visible to a perifovea of an eye, preferably during stable fixation of an abject, specified in degrees of visual angle. The perifoveal visual field is defined by the apex angle aPerifovea. The apex angle aPerifovea is in a range of 17.5° to 18.5°.

[0135] An “as-worn position” is as defined in ISO 13666:2019(E), entry 3.2.36, a position, including orientation, of spectacle lenses (3.5.2) relative to eyes and face during wear.

[0136] The as-worn position comprises

[0137] - a vertex distance as defined in ISO 13666:2019(E), entry 3.2.40, as horizontal distance between the back surface (3.2.14) of the spectacle lens (3.5.2) and the apex of the cornea, measured with eyes in the primary position (3.2.26), the definition including note 1 to entry 3.2.40 of ISO 13666:2019(E), said vertex distance being 12 mm,

[0138] - a primary direction as defined in ISO 13666:2019(E), entry 3.2.25,

[0139] - an as-worn pantoscopic angle as defined in ISO 13666:2019(E), entry 3.2.37, as vertical angle between a horizontal and a perpendicular to a reference line passing through an apex of grooves of upper and lower rims of a frame in a vertical plane containing the primary direction (3.2.25), the definition including notes 1 to 4 to entry 3.2.37 of ISO 13666:2019(E), said as-worn pantoscopic angle being 0°,

[0140] - an as-worn face form angle as defined in ISO 13666:2019(E), entry 3.2.38, as horizontal angle between the primary direction (3.2.25) and a perpendicular to a reference line passing through an apex of grooves of nasal and temporal rims of the frame in a horizontal plane containing the primary direction, the definition including notes 1 to 4 to entry 3.2.38 of ISO 13666:2019(E), said as-worn face form angle being 0°.

[0141] The projection of the perifoveal visual field onto the surface of the spectacle lens having at least one intersection with the ring-shaped onset line of the ring-shaped structure, the perifoveal visual field having an apex angle aPerifovea in a range of 17.5° to 18.5°, clarifies that the connected zone that is limited in any direction towards to the periphery of the spectacle lens by said ring-shaped onset line of said ring-shaped structure expands in at least one direction outside of said perifoveal visual field and thus enables the spectacle lens wearer to better recognize an object fixated though said connected zone. As the connected zone expands in at least one direction outside of said perifoveal visual field, the acceptance and the comfort of wearability of such a spectacle lens increased. At the same time, the onset line of the ring-shaped structure expands in at least one other direction into said perifoveal visual field. As the onset line of the ring-shaped structure expands in at least one other direction into said perifoveal visual field, the probable efficacy of the spectacle lens for reducing the progression of myopia of the spectacle lens wearer is increased. TW 201939117 A, in particular figures 1 and 3 shows that the star-shaped clear zone is within a parafoveal visual field. WO 2023 / 156052 A1 explains that the smaller the central zone width is the more decreased the comfort of wearability of such a spectacle lens is. In the light of the disclosure of WO 2023 / 156052 A1 , a spectacle lens with the star-shaped clear zone disclosed in TW 201939117 A is assumed to be of decreased comfort of wearability and thus not accepted by the spectacle lens wearer.

[0142] Preferably, the spectacle lens comprising the ring-shaped structure and the connected zone, said spectacle lens comprising the optical centre of the spectacle lens or the fitting point of the spectacle lens, said connected zone being limited in any direction towards to the periphery of said spectacle lens by the ring-shaped onset line of said ring-shaped structure, said ring-shaped onset line of said ringshaped structure having a convexity of below 1 , is characterized in that said connected zone surrounds at least one of at least one structure and at least one ring-shaped structure.

[0143] The connected zone “surrounds” or encircles at least one of

[0144] - at least one structure,

[0145] - at least one ring-shaped structure.

[0146] The connected zone surrounds or encircles a structure when an onset line limiting said structure is surrounded or encircled by the connected zone.

[0147] The connected zone surrounds or encircles a ring-shaped structure when an outer onset line limiting said ring-shaped structure is surrounded or encircled by the connected zone.

[0148] A “structure”, in particular the structure surrounded or encircled by the connected zone, is a domain of the spectacle lens having at least one of i) the surface power different to the surface power of the spectacle lens comprising said structure outside the domain occupied by any structure, in particular outside the domain occupied by the structure surrounded or encircled by the connected zone ii) the luminous transmittance different to the luminous transmittance of the spectacle lens outside the domain occupied by any structure, in particular outside the domain occupied by the structure surrounded or encircled by the connected zone.

[0149] Additionally to the before-mentioned difference in luminous transmittance or alternatively to the beforementioned difference in luminous transmittance, the structure, in particular the structure surrounded or encircled by the connected zone, may be the domain of the spectacle lens providing a) narrow angle scatter or b) wide angle scatter.

[0150] The following shall apply to any structure, preferably to any structure that is not ring-shaped. In particular, the following shall apply to the structure that is surrounded or encircled by the connected zone:

[0151] The onset line of the structure passes along each onset of the structure. Each onset of said structure represents, along a perimeter of the structure, a last position along any line from a centroid of said structure to a periphery of said structure in which a surface of said structure differs from the surface of the spectacle lens comprising said structure. In other words, the structure being surrounded or encircled by the connected zone means that each onset of said structure represents, along a perimeter of the structure, a last position along any line from the centroid of said structure to the periphery of said structure in which the surface of said structure differs from the surface of the spectacle lens comprising said structure surrounded by the connected zone. The surface of the structure differs from the surface of the spectacle lens comprising said structure in at least one of the surface power and the luminous transmittance.

[0152] The structure may be circular-shaped, for example.

[0153] A ’’ring-shaped structure”, in particular the ring-shaped structure surrounded or encircled by the connected zone, is a domain of the spectacle lens having at least one of i) the surface power different to the surface power of the spectacle lens comprising said ring-shaped structure outside the domain occupied by any ring-shaped structure, in particular the ring-shaped structure surrounded or encircled by the connected zone ii) the luminous transmittance different to the luminous transmittance of the spectacle lens outside the domain occupied by any ring-shaped structure, in particular the ring-shaped structure surrounded or encircled by the connected zone.

[0154] Additionally to the before-mentioned difference in luminous transmittance or alternatively to the beforementioned difference in luminous transmittance, the ring-shaped structure, in particular the ringshaped structure surrounded or encircled by the connected zone, may be the domain of the spectacle lens providing a) narrow angle scatter or b) wide angle scatter.

[0155] The outer onset line of the ring-shaped structure surrounded or encircled by the connected zone passes each outer onset of the ring-shaped structure. Each outer onset of said ring-shaped structure represents along an outer perimeter of the ring-shaped structure, a last position along any line from a centroid of said ring-shaped structure to a periphery of said ring-shaped structure in which a surface of said ring-shaped structure differs from the surface of the spectacle lens comprising said ring-shaped structure. In other words, the ring-shaped structure being surrounded or encircled by the connected zone means that each outer onset of said ring-shaped structure represents, along an outer perimeter of the ring-shaped structure, a last position along any line from the centroid of said ring-shaped structure to the periphery of said ring-shaped structure in which the surface of said ring-shaped structure differs from the surface of the spectacle lens comprising said ring-shaped structure surrounded by the connected zone. The ring-shaped structure has a path within said ring-shaped structure that surrounds a structure-free domain of said ring-shaped structure from a point within said ring-shaped structure and ends in said point again. The structure-free domain of the ring-shaped structure is a domain of the surface of the spectacle lens encircled or surrounded by the ring-shaped structure, said domain being outside a domain occupied by the ring-shaped structure. In other words, the structure-free domain of the ring-shaped structure is a domain of the surface of the spectacle lens calculated to provide the ordered power for correcting the wearer's vision. The structure-free domain of the ring-shaped structure is limited by an inner onset line of said ring-shaped structure. The inner onset line of the ring-shaped structure passes each inner onset of the ring-shaped structure. Each inner onset of said ring-shaped structure represents along a perimeter of the structure-free domain of the ring-shaped structure a first position along any line from a centroid of said ring-shaped structure to a periphery of said ring-shaped structure in which a surface of said ring-shaped structure differs from the surface of the spectacle lens comprising said ring-shaped structure. In other words, the ringshaped structure surrounding or encircling the structure-free domain means that each inner onset of said ring-shaped structure represents, along a perimeter of the structure-free domain surrounded of encircled by the ring-shaped structure, a first position along any line from the centroid of said ringshaped structure to the periphery of said ring-shaped structure in which the surface of said ringshaped structure differs from the surface of the spectacle lens comprising said ring-shaped structure. The surface of the ring-shaped structure differs from the surface of the spectacle lens comprising said ring-shaped structure in at least one of the surface power and the luminous transmittance.

[0156] At least one of the inner onset line and the outer onset line of the ring-shaped structure may be circular-shaped, for example.

[0157] At least one of the inner onset line and the outer onset line of the ring-shaped structure, the ringshaped structure surrounded or encircled by the connected zone, preferably replicates a shape of the ring-shaped onset line of the ring-shaped structure surrounding the connected zone but in a smaller dimension. In other words, at least one of the inner onset line and the outer onset line of the ringshaped structure, the ring-shaped structure surrounded or encircled by the connected zone, preferably is of similar symmetry as the ring-shaped onset line of the ring-shaped structure surrounding the connected zone. A symmetry of the inner onset line or the outer onset line of the ring-shaped structure, the ring-shaped structure surrounded or encircled by the connected zone, is similar to the ring-shaped onset line of the ring-shaped structure that surrounds the connected zone when a number of intersections with respective reference circles is identical. With respect to the inner onset line of the ring-shaped structure, the ring-shaped structure surrounded or encircled by the connected zone, a reference circle around a centroid of said inner onset line of said ring-shaped structure has a radius equal to a mean distance. The mean distance is a distance halfway between a) a maximal distance of the centroid of said inner onset line to said inner onset line and b) a minimal distance of the centroid of said inner onset line to said inner onset line.

[0158] With respect to the outer onset line of the ring-shaped structure, the ring-shaped structure surrounded or encircled by the connected zone, a reference circle around a centroid of said outer onset line of said ring-shaped structure has a radius equal to a mean distance. The mean distance is a distance halfway between a) a maximal distance of the centroid of said outer onset line to said outer onset line and b) a minimal distance of the centroid of said outer onset line to said outer onset line.

[0159] With respect to the ring-shaped onset line of the ring-shaped structure that surrounds the connected zone, a reference circle around a centroid of said ring-shaped onset line of the ring-shaped structure that surrounds the connected zone has a radius equal to a mean distance. The mean distance is a distance halfway between a) a maximal distance between the centroid of said ring-shaped onset line of the ring-shaped structure and said ring-shaped onset line and b) a minimal distance between the centroid of said ring-shaped onset line of the ring-shaped structure and said ring-shaped onset line. Preferably, said reference circle centred at said centroid of said ring-shaped onset line of the ringshaped structure that surrounds the connected zone has more than eight intersections with said ringshaped onset line of the ring-shaped structure that surrounds the connected zone. Preferably, said reference circle centred at said centroid of said ring-shaped onset line of the ring-shaped structure that surrounds the connected zone intersects in mutually different positions said ring-shaped onset line of the ring-shaped structure that surrounds the connected zone

[0160] - more than eight times and less than seventy-three times

[0161] - ten times

[0162] - more than ten times and less than thirty-seven times

[0163] - twelve times

[0164] - more than twelve times and less than twenty-one times.

[0165] The optical centre or the fitting point of the spectacle lens may be comprised in the structure-free domain surrounded or encircled by one ring-shaped structure, said ring-shaped structure in turn being surrounded or encircled by the connected zone.

[0166] As mentioned before, WO 2023 / 156052 A1 discloses a dependency between the central zone width and the probable efficacy of the spectacle lens comprising the central clear zone for the reduction of progression of myopia of the spectacle lens wearer. Decreasing the central zone width is assumed to increase the probable efficacy of such a spectacle lens for the reduction of progression of myopia of the spectacle lens wearer, whereas increasing the central zone width is assumed to decrease said probable efficacy. At the same time, according to WO 2023 / 156052 A1 , decreasing the central zone width is assumed to come along with decreased comfort in wearability of such a spectacle lens, whereas increasing the central zone width is assumed to come along with increased comfort in wearability of such a spectacle lens. So, what has been explained before with respect to the simply connected zone, is true for the connected zone as well. The projection of the perifoveal visual field onto the surface of the spectacle lens having the at least one intersection with the ring-shaped onset line of the ring-shaped structure meaning the connected zone having mutually different expansions combines both beneficial effects disclosed in WO 2023 / 156052 A1 within said connected zone. When the connected zone additionally surrounds or encircles the at least one structure and / or the at least one ring-shaped structure, the at least one structure and / or the at least one ring-shaped structure is assumed to additionally increase the probable efficacy of such a spectacle lens for the reduction of progression of myopia of the spectacle lens wearer. The decrease in comfort in wearability is compensated by the structure-free domain

[0167] - surrounding the at least one structure,

[0168] - surrounding the at least one ring-shaped structure and surrounded by the at least one ring-shaped structure.

[0169] Preferably, the spectacle lens comprising the ring-shaped structure and the connected zone, said spectacle lens comprising the optical centre of the spectacle lens or the fitting point of the spectacle lens, said connected zone being limited in any direction towards to the periphery of said spectacle lens by the ring-shaped onset line of said ring-shaped structure, said ring-shaped onset line of said ringshaped structure having a convexity of below 1 , is characterized in comprising a plurality of structure- free simply connected zones, each structure-free simply connected zone of said plurality of structure- free simply connected zones a) being limited by a ring-shaped onset line of a ring-shaped structure and b) having no intersection with said connected zone limited in any direction towards to the periphery of said spectacle lens by the ring-shaped onset line of said ring-shaped structure.

[0170] As mentioned before, in case of a roving eye, the plurality of structure-free simply connected zones allow clear vision through each structure-free simply connected zone of said plurality of structure-free simply connected zones towards peripheral objects since the spectacle lens is calculated to provide the ordered power for correcting the wearer’s vision.

[0171] Preferably, the spectacle lens comprising the ring-shaped structure and the connected zone, said spectacle lens comprising the optical centre of the spectacle lens or the fitting point of the spectacle lens, said connected zone being limited in any direction towards to the periphery of said spectacle lens by the ring-shaped onset line of said ring-shaped structure, said ring-shaped onset line of said ringshaped structure having a convexity of below 1 , is characterized in that a ratio of a maximal distance of a centroid of said ring-shaped onset line of said ring-shaped structure to a minimal distance of said centroid of said ring-shaped onset line of said ring-shaped structure is selected from one of the following:

[0172] - said ratio of said maximal distance to said minimal distance is above 2.0,

[0173] - said ratio of said maximal distance to said minimal distance is above 2.1 ,

[0174] - said ratio of said maximal distance to said minimal distance is above 2.2,

[0175] - said ratio of said maximal distance to said minimal distance is above 2.3.

[0176] The ratio between said maximal distance to said minimal distance being above any one of the before mentioned values ensures that the alternating minimal and maximal distances of the ring-shaped onset line of the ring-shaped structure limiting the connected zone combine an increased probable efficacy of the spectacle lens in terms of reduction of progression of myopia with a comfort of wearability. That means, in positions in which the connected zone is limited by the ring-shaped onset line of the ring-shaped structure having the minimal distance to the centroid of the ring-shaped onset line, the probable efficacy of the spectacle lens in terms of reduction of progression of myopia is provided. This also means that in positions in which the connected zone is limited by the ring-shaped onset line of the ring-shaped structure having the maximal distance to the centroid of the ring-shaped onset line, the comfort of wearability is given and thus the acceptance of the spectacle lens ensured.

[0177] Preferably, the minimal distance of the centroid of the ring-shaped onset line of the ring-shaped structure to the ring-shaped onset line of the ring-shaped structure, the ring-shaped onset line of the ring-shaped structure limits the connected zone i) in any direction from the optical centre of the spectacle lens towards the periphery of the spectacle lens or ii) in any direction from the optical centre of the spectacle lens towards the periphery of the spectacle lens, is

[0178] - a range of 1 mm to 8 mm

[0179] - a range of 1 .5 mm to 7 mm

[0180] - a range of 2 mm to 6 mm - a range of 2.5 mm to 5 mm.

[0181] Predetermining said minimal distance of said centroid of said ring-shaped structure to said ringshaped structure in one of the above-mentioned ranges ensures an increased probable efficacy for the reduction of myopia progression for the spectacle lens wearer.

[0182] The spectacle lens comprises a ring-shaped structure and a simply connected zone, the spectacle lens is characterized in that said simply connected zone comprises an optical centre or a fitting point, said optical centre being defined as in ISO 13666:2019(E), entry 3.2.15, said fitting point being as defined in ISO 13666:2019(E), entry 3.2.34, said simply connected zone is spaced apart in any direction towards a periphery of said spectacle lens from a connected zone by a first ring-shaped structure, said connected zone being limited by an onset line of a second ring-shaped structure, said onset line of said second ring-shaped structure having at least one intersection with a projection of a perifoveal visual field onto a surface of said spectacle lens, said projection of said perifoveal visual field being defined with respect to

[0183] A) an eye model comprising

[0184] - an optical axis of an eye,

[0185] - a distance from a pupil plane of said eye to an apex of a cornea of said eye along said optical axis, said distance being 2 mm,

[0186] - said perifoveal visual field being defined by a right circular double cone Cperifo ea with an axis coinciding with said optical axis, an apex of said right circular double cone C erifovea being located at an intersection of said optical axis with said pupil plane having an apex angle ctpenfovea, said apex angle Qperifovea being in a range of 17.5° to 18.5°, said apex angle Gperifovea being identical for said perifoveal visual field and said right circular double cone Cperifovea, and

[0187] B) an as-worn position as defined in ISO 13666:2019(E), entry 3.2.36, comprising

[0188] - a vertex distance as defined in ISO 13666:2019(E), entry 3.2.40, said vertex distance being 12 mm,

[0189] - a primary direction as defined in ISO 13666:2019(E), entry 3.2.25,

[0190] - an as-worn pantoscopic angle as defined in ISO 13666:2019(E), entry 3.2.37, said as-worn pantoscopic angle being 0°,

[0191] - an as-worn face form angle as defined in ISO 13666:2019(E), entry 3.2.38, said as-worn face form angle being 0°.

[0192] In particular, the spectacle lens comprises a ring-shaped structure and a structure-free simply connected zone, the spectacle lens is characterized in that said structure-free simply connected zone comprises an optical centre or a fitting point, said optical centre being defined as in ISO

[0193] 13666:2019(E), entry 3.2.15, said fitting point being as defined in ISO 13666:2019(E), entry 3.2.34, said structure-free simply connected zone is spaced apart in any direction towards a periphery of said spectacle lens from a connected zone by a first ring-shaped structure, said connected zone being limited by an onset line of a second ring-shaped structure, said onset line of said second ring-shaped structure having at least one intersection with a projection of a perifoveal visual field onto a surface of said spectacle lens, said projection of said perifoveal visual field being defined with respect to

[0194] A) an eye model comprising

[0195] - an optical axis of an eye,

[0196] - a distance from a pupil plane of said eye to an apex of a cornea of said eye along said optical axis, said distance being 2 mm,

[0197] - said perifoveal visual field being defined by a right circular double cone Cperifovea with an axis coinciding with said optical axis, an apex of said right circular double cone Cperifovea being located at an intersection of said optical axis with said pupil plane having an apex angle dperifovea, said apex angle Qperifovea being in a range of 17.5° to 18.5°, said apex angle Cperifovea being identical for said perifoveal visual field and said right circular double cone Cperifovea, and

[0198] B) an as-worn position as defined in ISO 13666:2019(E), entry 3.2.36, comprising

[0199] - a vertex distance as defined in ISO 13666:2019(E), entry 3.2.40, said vertex distance being

[0200] 12 mm,

[0201] - a primary direction as defined in ISO 13666:2019(E), entry 3.2.25,

[0202] - an as-worn pantoscopic angle as defined in ISO 13666:2019(E), entry 3.2.37, said as-worn pantoscopic angle being 0°,

[0203] - an as-worn face form angle as defined in ISO 13666:2019(E), entry 3.2.38, said as-worn face form angle being 0°.

[0204] The simply connected zone, i.e., the structure-free simply connected zone, is “spaced apart” in any direction towards the periphery of the spectacle lens from the connected zone by a first ring-shaped structure means that the structure-free simply connected zone is surrounded or encircled, along any line from the optical centre of the spectacle lens towards the periphery of the spectacle lens or along any line from the fitting point of the spectacle lens towards the periphery of the spectacle lens, by the first ring-shaped structure. The first ring-shaped structure separates the structure-free simply connected zone of the spectacle lens, said structure-free simply connected zone comprising either the optical centre or the fitting point of the spectacle lens, from the connected zone of said spectacle lens. The “first ring-shaped structure” is, along any line from the optical centre of the spectacle lens towards the periphery of the spectacle lens or along any line from the fitting point of the spectacle lens towards the periphery of the spectacle lens, a first structure having a path within said structure that surrounds a structure-free domain of said structure from a point within said structure and ends in said point again. The first ring-shaped structure is a domain of the spectacle lens having at least one of i) the surface power different to the surface power of the surface of the spectacle lens comprising said first ring-shaped structure outside the domain occupied by the first ring-shaped structure ii) the luminous transmittance different to the luminous transmittance of the spectacle lens outside the domain occupied by the first ring-shaped structure.

[0205] In other words, in each position within a domain of the first ring-shaped structure, i) the surface power of a surface of the first ring-shaped structure is different to the surface power of the surface of the spectacle lens outside the domain of the first ring-shaped structure, and / or ii) the luminous transmittance of the first ring-shaped structure is different to the luminous transmittance of the spectacle lens outside the domain of the first ring-shaped structure.

[0206] This means, the first ring-shaped structure is a ring-shaped domain of the spectacle lens having, in each position within the ring-shaped domain of the spectacle lens, at least one of i) the surface power different to the surface power of the surface of the spectacle lens outside the ring-shaped domain of the spectacle lens, the surface of the spectacle lens comprising the first ring-shaped structure, ii) the luminous transmittance different to the luminous transmittance of the spectacle lens outside the ring-shaped domain of the spectacle lens, the surface of the spectacle lens comprising the first ring-shaped structure.

[0207] Additionally to the before-mentioned difference in luminous transmittance or alternatively to the beforementioned difference in luminous transmittance, the first ring-shaped structure may be a domain of the spectacle lens providing a) narrow angle scatter or b) wide angle scatter.

[0208] Preferably, the first ring-shaped structure is the domain of the spectacle lens having the surface power different to the surface power of the surface of the spectacle lens comprising said first ring-shaped structure outside the domain occupied by the first ring-shaped structure.

[0209] The structure-free domain of the first ring-shaped structure is at least one of i) a domain of the spectacle lens encircled or surrounded by said first ring-shaped structure, said domain being outside a domain occupied by said first ring-shaped structure, ii) a domain of the surface of the spectacle lens encircled or surrounded by said first ring-shaped structure, said domain being outside a domain occupied by said first ring-shaped structure.

[0210] In other words, the structure-free domain of said first ring-shaped structure corresponds to or is the domain of the simply connected zone. The structure-free domain encircled or surrounded by the first ring-shaped structure is calculated to provide the ordered power for correcting the wearer's vision. The structure-free domain encircled or surrounded by the first ring-shaped structure is limited via a ringshaped inner onset line of said first ring-shaped structure along any line from the optical centre of the spectacle lens towards the periphery of the spectacle lens or along any line from the fitting point of the spectacle lens towards the periphery of the spectacle lens. In other words, the ring-shaped inner onset line of the first ring-shaped structure surrounds or encircles the simply connected zone, i.e. the structure-free simply connected zone, of the spectacle lens. The structure-free simply connected zone comprises the optical centre or the fitting point of the spectacle lens. The ring-shaped inner onset line of the first ring-shaped structure is an onset line that, beginning in a point, surrounds or encircles the structure-free domain of the first ring-shaped structure and ends in said point again. This means, the structure-free domain of the first ring-shaped structure is the structure-free simply connected zone. The ring-shaped inner onset line of the first ring-shaped structure passes along each inner onset of the first ring-shaped structure. Each inner onset of said first ring-shaped structure represents, along a perimeter of the structure-free domain surrounded or encircled by the first ring-shaped structure i) a first position along any line from the optical centre of the spectacle lens towards a periphery of the spectacle lens in which a surface of said first ring-shaped structure differs from the surface of the spectacle lens comprising said first ring-shaped structure or ii) a first position along any line from the fitting point of the spectacle lens towards the periphery of the spectacle lens in which a surface of said first ring-shaped structure differs from the surface of the spectacle lens comprising said first ringshaped structure. The first ring-shaped structure is limited along any line from the optical centre of the spectacle lens towards the periphery of the spectacle lens or along any line from the fitting point of the spectacle lens towards the periphery of the spectacle lens by said ring-shaped inner onset line and a ring-shaped outer onset line. The ring-shaped outer onset line of the first ring-shaped structure is an onset line that, beginning in a point, surrounds or encircles along the outer perimeter said first ringshaped structure and ends in said point again. The ring-shaped outer onset line of the first ringshaped structure passes each outer onset of the first ring-shaped structure. Each outer onset of said ring-shaped structure represents along an outer perimeter of the first ring-shaped structure a last position i) along any line from the optical centre of the spectacle lens towards the periphery of the spectacle lens or ii) along any line from the fitting point of the spectacle lens towards the periphery of the spectacle lens in which the surface of the first ring-shaped structure differs from the surface of the spectacle lens comprising said first ring-shaped structure. The surface of the first ring-shaped structure differs from the surface of the spectacle lens comprising said first ring-shaped structure in at least one of the surface power and the luminous transmittance. Preferably, the surface of the first ringshaped structure differs from the surface of the spectacle lens comprising said first ring-shaped structure in the surface power. The first ring-shaped structure is surrounded or encircled by the connected zone of the spectacle lens. That, along any line from the optical centre of the spectacle lens towards the periphery of the spectacle lens, the surface of the first ring-shaped structure differs in the first position in the surface power from the surface of the spectacle lens comprising said first ringshaped structure, preferably means that, along any line from the optical centre of the spectacle lens towards the periphery of the spectacle lens, a surface power gradient in said first position is above a predefined threshold for surface power gradient. Preferably, said predefined threshold for surface power gradient is equal to or larger than 0.75 dioptres / mm. That, along any line from the fitting point of the spectacle lens towards the periphery of the spectacle lens, the surface of the first ring-shaped structure differs in the first position in the surface power from the surface of the spectacle lens comprising said first ring-shaped structure, preferably means that, along any line from the fitting point of the spectacle lens towards the periphery of the spectacle lens, the surface power gradient in the said first position is above a predefined threshold for surface power gradient. Preferably, said predefined threshold for surface power gradient is equal to or larger than 0.75 dioptres / mm. That, along any line from the optical centre of the spectacle lens towards the periphery of the spectacle lens, the surface of the first ring-shaped structure differs in the first position in the surface power from the surface of the spectacle lens comprising said first ring-shaped structure more preferably means that the surface power is discontinuous in said first position along a respective line from the optical centre of the spectacle lens towards the periphery of the spectacle lens. In other words, that, along any line from the optical centre of the spectacle lens towards the periphery of the spectacle lens, the surface of the first ring-shaped structure differs in the first position in surface power from the surface of the spectacle lens comprising said first ring-shaped structure, more preferably means that the surface power is discontinuous in said first position along a respective line from the optical centre of the spectacle lens towards the periphery of the spectacle lens.

[0211] That, along any line from the fitting point of the spectacle lens towards the periphery of the spectacle lens, the surface of the first ring-shaped structure differs in the first position in the surface power from the surface of the spectacle lens comprising said first ring-shaped structure more preferably means that the surface power is discontinuous in said first position along a respective line from the fitting point of the spectacle lens towards the periphery of the spectacle lens. In other words, that, along any line from the fitting point of the spectacle lens towards the periphery of the spectacle lens, the surface of the first ring-shaped structure differs in the first position in surface power from the surface of the spectacle lens comprising said first ring-shaped structure, more preferably means that the surface power is discontinuous in said first position along a respective line from the fitting point of the spectacle lens towards the periphery of the spectacle lens.

[0212] At least one of the ring-shaped inner onset line of the first ring-shaped structure and the ring-shaped outer onset line of the first ring-shaped structure preferably has a convexity of below 1 . Preferably, the convexity of at least one of the inner ring-shaped onset line and the outer ring-shaped onset line of the first ring-shaped structure is selected from at least one of the following values:

[0213] - the convexity being below 0.9,

[0214] - the convexity being below 0.8,

[0215] - the convexity being below 0.75,

[0216] - the convexity being below 0.7.

[0217] Preferably, both, the ring-shaped inner onset line of the first ring-shaped structure and the ring-shaped outer onset line of the first ring-shaped structure has a convexity of below 1. Preferably, the ringshaped inner onset line of the first ring-shaped structure and the ring-shaped outer onset line of the first ring-shaped structure have a same convexity, preferably selected from one of the before mentioned values.

[0218] The connected zone of the spectacle lens is “limited by a ring-shaped onset line of a second ringshaped structure” means that the connected zone is limited by the ring-shaped onset line of the second ring-shaped structure i) along any line from the optical centre of the spectacle lens towards the periphery of the spectacle lens or ii) along any line from the fitting point of the spectacle lens towards the periphery of the spectacle lens. The ring-shaped onset line of the second ring-shaped structure surrounds or encircles the connected zone of the spectacle lens. The ring-shaped onset line of the second ring-shaped structure surrounding or encircling the connected zone of the spectacle lens has a convexity of below 1 . Preferably, the convexity of the ring-shaped onset line of the second ring-shaped structure or the convexity of the connected zone, respectively, is selected from at least one of the following values:

[0219] - the convexity being below 0.9,

[0220] - the convexity being below 0.8,

[0221] - the convexity being below 0.75,

[0222] - the convexity being below 0.7. The onset line of the second ring-shaped structure is a ring-shaped onset line that, beginning in a point, surrounds or encircles the connected zone and ends in said point again. The ring-shaped onset line of the second ring-shaped structure passes along each onset of the second ring-shaped structure. Each onset of said second ring-shaped structure represents, along the outer perimeter of the connected zone, i) a first position along any line from the optical centre of the spectacle lens towards the periphery of the spectacle lens in which the surface of said second ring-shaped structure differs from the surface of the spectacle lens comprising said second ring-shaped structure or ii) a first position along any line from the fitting point of the spectacle lens towards the periphery of the spectacle lens in which the surface of said second ring-shaped structure differs from the surface of the spectacle lens comprising said second ring-shaped structure. The surface of the second ring-shaped structure differs from the surface of the spectacle lens comprising said second ring-shaped structure in at least one of the surface power and the luminous transmittance. Preferably, the surface of the second ring-shaped structure differs from the surface of the spectacle lens comprising said second ring-shaped structure in the surface power.

[0223] That, along any line from the optical centre of the spectacle lens towards the periphery of the spectacle lens, the surface of the second ring-shaped structure differs in the first position in the surface power from the surface of the spectacle lens comprising said second ring-shaped structure, preferably means that, along any line from the optical centre of the spectacle lens towards the periphery of the spectacle lens, a surface power gradient in said first position is above a predefined threshold for surface power gradient. Preferably, said predefined threshold for surface power gradient is equal to or larger than 0.75 dioptres / mm. That, along any line from the fitting point of the spectacle lens towards the periphery of the spectacle lens, the surface of the second ring-shaped structure differs in the first position in the surface power from the surface of the spectacle lens comprising said second ring-shaped structure, preferably means that, along any line from the fitting point of the spectacle lens towards the periphery of the spectacle lens, the surface power gradient in the said first position is above a predefined threshold for surface power gradient. Preferably, said predefined threshold for surface power gradient is equal to or larger than 0.75 dioptres / mm.

[0224] That, along any line from the optical centre of the spectacle lens towards the periphery of the spectacle lens, the surface of the second ring-shaped structure differs in the first position in the surface power from the surface of the spectacle lens comprising said second ring-shaped structure more preferably means that the surface power is discontinuous in said first position along a respective line from the optical centre of the spectacle lens towards the periphery of the spectacle lens. In other words, that, along any line from the optical centre of the spectacle lens towards the periphery of the spectacle lens, the surface of the second ring-shaped structure differs in the first position in surface power from the surface of the spectacle lens comprising second said ring-shaped structure, more preferably means that the surface power is discontinuous in said first position along a respective line from the optical centre of the spectacle lens towards the periphery of the spectacle lens.

[0225] That, along any line from the fitting point of the spectacle lens towards the periphery of the spectacle lens, the surface of the second ring-shaped structure differs in the first position in the surface power from the surface of the spectacle lens comprising said second ring-shaped structure more preferably means that the surface power is discontinuous in said first position along a respective line from the fitting point of the spectacle lens towards the periphery of the spectacle lens. In other words, that, along any line from the fitting point of the spectacle lens towards the periphery of the spectacle lens, the surface of the second ring-shaped structure differs in the first position in surface power from the surface of the spectacle lens comprising said second ring-shaped structure, more preferably means that the surface power is discontinuous in said first position along a respective line from the fitting point of the spectacle lens towards the periphery of the spectacle lens.

[0226] The “second ring-shaped structure” is, i) along any line from the optical centre of the spectacle lens towards the periphery of the spectacle lens or ii) along any line from the fitting point of the spectacle lens towards the periphery of the spectacle lens, a second structure having a path within said structure that surrounds a structure-free domain of said structure from a point within said structure and ends in said point again.

[0227] The second ring-shaped structure is a domain of the spectacle lens having at least one of ii) the surface power different to the surface power of the surface of the spectacle lens comprising said second ring-shaped structure outside the domain occupied by the second ring-shaped structure ii) the luminous transmittance different to the luminous transmittance of the spectacle lens outside the domain occupied by the second ring-shaped structure.

[0228] In other words, in each position within a domain of the second ring-shaped structure, i) the surface power of a surface of the second ring-shaped structure is different to the surface power of the surface of the spectacle lens outside the domain of the second ring-shaped structure, and / or ii) the luminous transmittance of the second ring-shaped structure is different to the luminous transmittance of the spectacle lens outside the domain of the second ring-shaped structure.

[0229] This means, the second ring-shaped structure is a ring-shaped domain of the spectacle lens having, in each position within the ring-shaped domain of the spectacle lens, at least one of i) the surface power different to the surface power of the surface of the spectacle lens outside the ring-shaped domain of the spectacle lens, the surface of the spectacle lens comprising the second ring-shaped structure, ii) the luminous transmittance different to the luminous transmittance of the spectacle lens outside the ring-shaped domain of the spectacle lens, the surface of the spectacle lens comprising the second ring-shaped structure.

[0230] Additionally to the before-mentioned difference in luminous transmittance or alternatively to the beforementioned difference in luminous transmittance, the second ring-shaped structure may be a domain of the spectacle lens providing a) narrow angle scatter or b) wide angle scatter.

[0231] Preferably, the second ring-shaped structure is a domain of the spectacle lens having the surface power different to the surface power of the surface of the spectacle lens comprising said second ringshaped structure outside the domain occupied by the second ring-shaped structure.

[0232] The structure-free domain of the second ring-shaped structure is at least one of i) a domain of the spectacle lens encircled or surrounded by said second ring-shaped structure, said domain being outside a domain occupied by said second ring-shaped structure, ii) a domain of the surface of the spectacle lens encircled or surrounded by said second ring-shaped structure, said domain being outside a domain occupied by said second ring-shaped structure.

[0233] Preferably, the connected zone is structure-free between

[0234] Ai) a last position along any line from the optical centre of the spectacle lens towards the periphery of the spectacle lens in which the surface of the first ring-shaped structure differs from the surface of the spectacle lens comprising said first ring-shaped structure or Aii) a last position along any line from the fitting point of the spectacle lens towards the periphery of the spectacle lens in which the surface of said first ring-shaped structure differs from the surface of the spectacle lens comprising said first ringshaped structure, and

[0235] Bi) a first position along any line from the optical centre of the spectacle lens towards the periphery of the spectacle lens in which the surface of the second ring-shaped structure differs from the surface of the spectacle lens comprising said second ring-shaped structure or Bii) a first position along any line from the fitting point of the spectacle lens towards the periphery of the spectacle lens in which the surface of said second ring-shaped structure differs from the surface of the spectacle lens comprising said second ring-shaped structure.

[0236] The surface of the first ring-shaped structure and the surface of the second ring-shaped structure each differs from the surface of the spectacle lens comprising said first ring-shaped structure and said second ring-shaped structure in at least one of the surface power and the luminous transmittance. Preferably, the surface of the first ring-shaped structure and the surface of the second ring-shaped structure each differs from the surface of the spectacle lens comprising said first ring-shaped structure and said second ring-shaped structure in the surface power.

[0237] The structure-free domain encircled or surrounded by the second ring-shaped structure is calculated to provide the ordered power for correcting the wearer's vision.

[0238] Preferably, at least one of the inner onset line of the first ring-shaped structure and the outer onset line of the first ring-shaped structure, said inner onset line surrounding the structure-free domain of the first ring-shaped structure or the simply connected zone, respectively, said outer onset line being surrounded or encircled by the connected zone, preferably the structure-free connected zone, is of similar symmetry as the onset line of the second ring-shaped structure.

[0239] Preferably, a ratio of a respective maximal distance to a respective minimal distance is selected from one the following

[0240] - the ratio of the respective maximal distance to the respective minimal distance is above 2.0

[0241] - the ratio of the respective maximal distance to the respective minimal distance is above 2.1

[0242] - the ratio of the respective maximal distance to the respective minimal distance is above 2.2

[0243] - the ratio of the respective maximal distance to the respective minimal distance is above 2.3, the respective maximal distance and the respective minimal distance being a) a maximal distance of a centroid of the inner onset line of the first ring-shaped structure to the inner onset line of the first ring-shaped structure and a minimal distance of said centroid of the inner onset line of the first ring-shaped structure to the inner onset line of the first ring-shaped structure, b) a maximal distance of a centroid of the outer onset line of the first ring-shaped structure to the outer onset line of the first ring-shaped structure and a minimal distance of said centroid of the outer onset line of the first ring-shaped structure to the outer onset line of the first ring-shaped structure, c) a maximal distance of a centroid of the second ring-shaped structure to the second ring-shaped structure and a minimal distance of said centroid of the second ring-shaped structure to the second ring-shaped structure.

[0244] The ring-shaped onset line of the second ring-shaped structure has at least one intersection with the projection of the perifoveal visual field onto the surface of the spectacle lens, said projection of said perifoveal visual field being defined with respect to

[0245] A) the eye model comprising

[0246] - the optical axis of an eye,

[0247] - the distance from the pupil plane of said eye to the apex of the cornea of said eye along said optical axis, said distance being 2 mm,

[0248] - the perifoveal visual field being defined by the right circular double cone Cperifovea with the axis coinciding with said optical axis, the apex of said right circular double cone Cperifovea being located at the intersection of said optical axis with said pupil plane having the apex angle aperifovea, said apex angle Qperifovea being in the range of 17.5° to 18.5°, said apex angle Qperifovea being identical for said perifoveal visual field and said right circular double cone Cperifovea, and

[0249] B) the as-worn position as defined in ISO 13666:2019(E), entry 3.2.36, comprising

[0250] - the vertex distance as defined in ISO 13666:2019(E), entry 3.2.40, said vertex distance being 12 mm,

[0251] - the primary direction as defined in ISO 13666:2019(E), entry 3.2.25,

[0252] - the as-worn pantoscopic angle as defined in ISO 13666:2019(E), entry 3.2.37, said as-worn pantoscopic angle being 0°,

[0253] - the as-worn face form angle as defined in ISO 13666:2019(E), entry 3.2.38, said as-worn face form angle being 0°.

[0254] The spectacle lens comprising the first ring-shaped structure and the second ring-shaped structure ensures that, on the one hand side, both the structure-free simply connected zone surrounded by the first ring-shaped structure and the, preferably structure-free, connected zone surrounded by the second ring-shaped structure allow for clear vision for a spectacle lens wearer. This means, the comfort in wearability is given for usually frequently used viewing directions due to. the structure-free simply connected zone and the, preferably structure-free connected zone, allowing for clear vision. On the other hand side, probable efficacy of the spectacle lens in terms of reduction of progression of myopia is even more increased due the first ring-shaped structure limiting the structure-free simply connected zone.

[0255] Preferably, the spectacle lens comprising the ring-shaped structure and the simply connected zone is characterized in comprising a plurality of structure-free simply connected zones, each structure-free simply connected zone of said plurality of structure-free simply connected zones a) being limited by a ring-shaped onset line of a ring-shaped structure and b) having no intersection with said connected zone limited by the onset line of the second ring-shaped structure.

[0256] With respect to the plurality of structure-free simply connected zones, reference is made to the before said.

[0257] The kit comprises a spectacle lens and further data, said spectacle lens comprising an optical centre of the spectacle lens or a fitting point of the spectacle lens, said optical centre being defined as in ISO 13666:2019(E), entry 3.2.15, said fitting point being as defined in ISO 13666:2019(E), entry 3.2.34, said spectacle lens comprising a ring-shaped structure and a connected zone, said connected zone being limited in any direction towards to a periphery of said spectacle lens by a ring-shaped onset line of said ring-shaped structure, said ring-shaped onset line of said ring-shaped structure having a convexity of below 1 , said further data comprising

[0258] - an eye model and

[0259] - an as-worn position as defined in ISO 13666:2019(E), entry 3.2.36, said kit being characterized in that a position of said ring-shaped structure and said connected zone of said spectacle lens of said kit is in accordance with said further data of said kit such that a projection of a perifoveal visual field onto a surface of said spectacle lens is having at least one intersection with said ring-shaped onset line of said ring-shaped structure, said perifoveal visual field is having an apex angle dpenfovea in a range of 17.5° to 18.5°, said ring-shaped onset line of said ringshaped structure is surrounding said optical centre or said fitting point, said projection of said perifoveal visual field being defined with respect to said eye model comprising

[0260] - an optical axis of an eye,

[0261] - a distance from a pupil plane of said eye to an apex of a cornea of said eye along said optical axis, said distance being 2 mm,

[0262] - said perifoveal visual field being defined by a right circular double cone Cperifovea with an axis coinciding with said optical axis, an apex of said right circular double cone Cperifovea being located at an intersection of said optical axis with said pupil plane having said apex angle aperifovea, said apex angle Qperifovea being identical for said perifoveal visual field and said right circular double cone CPerifovea, and said as-worn position.

[0263] The ring-shaped onset line of the ring-shaped structure that is limiting the connected zone of the spectacle lens of the kit in any direction towards the periphery of the spectacle lens of the kit, preferably from the optical centre of the spectacle lens of the kit in any direction towards the periphery of the spectacle lens or from the fitting point of the spectacle lens of the kit in any direction towards the periphery of the spectacle lens, a) has a convexity below 1 , i.e., said ring-shaped onset line of the ring-shaped structure is not circular, b) preferably surrounds or encircles the optical centre of the spectacle lens of the kit or the fitting point of the spectacle lens of the kit, c) has at least one intersection with a projection of a perifoveal visual field onto a surface of said spectacle lens, said perifoveal visual field having an apex angle aperifovea in a range of 17.5° to 18.5°.

[0264] The ring-shaped onset line of the ring-shaped structure passes along each onset of said ring-shaped structure, each onset of said ring-shaped structure is, along the perimeter of the connected zone, i) the first position along any line from the optical centre of said spectacle lens towards the periphery of the spectacle lens in which the surface of said ring-shaped structure differs in surface power from the surface of said spectacle lens comprising said ring-shaped structure or ii) the first position along any line from said fitting point of said spectacle lens towards the periphery of said spectacle lens in which the surface of said ring-shaped structure differs in surface power from the surface of said spectacle lens comprising said ring-shaped structure, as explained before.

[0265] The spectacle lens of the kit is characterized in that a position of the ring-shaped structure and a position of the connected zone each is in accordance with the further data.

[0266] The kit comprises the spectacle lens described before and further data, said further data comprising the eye model described before and the as-worn position as defined in ISO 13666:2019(E), entry 3.2.36. As mentioned before, the as-worn position as defined in ISO 13666:2019(E), is the position including orientation, of the spectacle lenses (3.5.2) relative to the eyes and face during wear. As in note 1 to entry 3.2.36 of ISO 13666:2019(E), the as-worn position shall be measured with habitual head and body posture. For distance vision, this is usually measured in the primary position (3.2.26) when looking straight ahead in unaided vision.

[0267] From the before-repeated definition of the as-worn position it is apparent that the as-worn position could not be identical for different individual spectacle lens wearers. Assuming the face form of an individual spectacle lens wearer being unique, necessarily the as-worn position is unique for an individual spectacle lens wearer as well, even if different individual spectacle lens wearers are wearing glasses having an identical spectacle frame.

[0268] Contrary to the spectacle lens described before, for which the position of the ring-shaped structure and the position of the connected zone each is in according with predefined data, namely the predefined eye model described before comprising

[0269] - the optical axis of the eye,

[0270] - the distance from the pupil plane of said eye to the apex of the cornea of said eye along said optical axis, said distance being 2 mm, and

[0271] - the perifoveal visual field being defined by a right circular double cone Cperifovea with the axis coinciding with said optical axis, the apex of said right circular double cone Cperifovea being located at the intersection of said optical axis with said pupil plane having the apex angle aperifovea, said apex angle Cperifovea being in the range of 17.5° to 18.5°, said apex angle Cperifo ea being identical for said perifoveal visual field and said right circular double cone Cperifovea, and the predefined as-worn position described before comprising - the vertex distance as defined in ISO 13666:2019(E), entry 3.2.40, said vertex distance being

[0272] 12 mm,

[0273] - the primary direction as defined in ISO 13666:2019(E), entry 3.2.25,

[0274] - the as-worn pantoscopic angle as defined in ISO 13666:2019(E), entry 3.2.37, said as-worn pantoscopic angle being 0°, and

[0275] - the as-worn face form angle as defined in ISO 13666:2019(E), entry 3.2.38, said as-worn face form angle being 0°, the spectacle lens comprised in the kit is characterized in that the position of the ring-shaped structure and the position of the connected zone each is in accordance with the further data, namely said predefined eye model and an as-worn position of each spectacle lens for the individual spectacle lens wearer. The as-worn position of each spectacle lens for the individual spectacle lens wearer as well as the predefined eye model is further data inseparable with the spectacle lens. The spectacle lens comprised in the kit without considering the further data may be considered as nothing more than a piece of broken glass for which, unaware of said further data, it is impossible to reconstruct the projection of the perifoveal visual field on the spectacle lens. In other words, additionally to the predefined eye model the as-worn position must be known for the individual spectacle lens wearer or assumed as a standard as-worn position to determine a relative position of the connected zone to the perifoveal visual field.

[0276] The as-worn position of the spectacle lens for the individual spectacle lens wearer usually is provided when ordering the spectacle lens from a spectacle lens manufacturer. In case the as-worn position of the spectacle lens for the individual spectacle lens wearer is not provided when ordering the spectacle lens, the spectacle lens manufacturer typically calculates the spectacle lens based on a standard as- worn position.

[0277] Not considering the surface power provided by the ring-shaped structure, both, the spectacle lens described before and the spectacle lens comprised in the kit are calculated to provide the ordered power for correcting the wearer's vision. Still not considering the surface power provided by the ringshaped structure, for calculating the spectacle lens described before to provide the ordered power, the predefined eye model and the predefined as-worn position may be considered. Alternatively, a different eye model, for example a standard eye model, and a different as-worn position, for example a standard as-worn position, may considered. Still not considering the surface power provided by the ring-shaped structure, for calculating the spectacle lens comprised in the kit to provide the ordered power for correcting the wearer's vision, the predefined eye model and the as-worn position for an individual spectacle lens wearer may be considered. Alternatively, a different eye model, for example a standard eye model, and the as-worn position for an individual spectacle lens wearer may be considered. Further alternatively, a different eye-model, for example a standard eye model, and a different as-worn position, for example, a standard as-worn position may be considered.

[0278] The as-worn position preferably comprises

[0279] - the vertex distance as defined in ISO 13666:2019(E), entry 3.2.40,

[0280] - the as-worn pantoscopic angle as defined in ISO 13666:2019(E), entry 3.2.37,

[0281] - the as-worn face form angle as defined in ISO 13666:2019(E), entry 3.2.38. The kit may comprise the spectacle lens or data of the spectacle lens, said data being configured for the purpose of a use for a manufacture of said spectacle lens. Preferably, the data of the spectacle lens is computer-readable data.

[0282] Preferably, the further data is computer-readable data.

[0283] The data of the spectacle lens and the further data each may be stored on a computer-readable medium or carried by a data signal. The computer-readable medium may be a non-transitory computer-readable storage medium.

[0284] Preferably, the kit comprising the spectacle lens and the further data, the spectacle lens comprising the optical centre of the spectacle lens or the fitting point of the spectacle lens, said optical centre being defined as in ISO 13666:2019(E), entry 3.2.15, said fitting point being as defined in

[0285] ISO 13666:2019(E), entry 3.2.34, the spectacle lens comprising the ring-shaped structure and the connected zone, said connected zone being limited in any direction towards to the periphery of the spectacle lens by the ring-shaped onset line of said ring-shaped structure, said ring-shaped onset line of said ring-shaped structure having a convexity of below 1 , said further data comprising the eye model and the as-worn position as defined in ISO 13666:2019(E), entry 3.2.36, the kit being characterized in that the ring-shaped onset line of said ring-shaped structure of said spectacle lens surrounds at least one of at least one structure and at least one ring-shaped structure.

[0286] Preferably, the kit comprising the spectacle lens and the further data, the spectacle lens comprising the optical centre of the spectacle lens or the fitting point of the spectacle lens, said optical centre being defined as in ISO 13666:2019(E), entry 3.2.15, said fitting point being as defined in

[0287] ISO 13666:2019(E), entry 3.2.34, the spectacle lens comprising the ring-shaped structure and the connected zone, said connected zone being limited in any direction towards to the periphery of the spectacle lens by the ring-shaped onset line of said ring-shaped structure, said ring-shaped onset line of said ring-shaped structure having a convexity of below 1 , said further data comprising the eye model and the as-worn position as defined in ISO 13666:2019(E), entry 3.2.36, the kit being characterized in that said spectacle lens of the kit comprises a plurality of structure-free simply connected zones, each structure-free simply connected zone of said plurality of structure-free simply connected zones a) being limited by a ring-shaped onset line of a ring-shaped structure and b) having no intersection with said connected zone limited in any direction towards to the periphery of said spectacle lens by the ring-shaped onset line of said ring-shaped structure.

[0288] The kit comprises a spectacle lens and further data, said spectacle lens comprising a ring-shaped structure and a simply connected zone, said further data comprising an eye model and an as-worn position as defined in ISO 13666:2019(E), entry 3.2.36, said kit being characterized in that a position of a second ring-shaped structure and a connected zone of said spectacle lens is in accordance with said further data such that a connected zone being limited by an onset line of a second ring-shaped structure, said onset line of said second ring-shaped structure having at least one intersection with a projection of a perifoveal visual field onto a surface of said spectacle lens, said projection of said perifoveal visual field being defined with respect to said eye model comprising

[0289] - an optical axis of an eye,

[0290] - a distance from a pupil plane of said eye to an apex of a cornea of said eye along said optical axis, said distance being 2 mm,

[0291] - said perifoveal visual field being defined by a right circular double cone Cperifovea with an axis coinciding with said optical axis, an apex of said right circular double cone C erifovea being located at an intersection of said optical axis with said pupil plane having an apex angle apenfo ea, said apex angle Cperifovea being in a range of 17.5° to 18.5°, said apex angle Cperifovea being identical for said perifoveal visual field and said right circular double cone Cperifovea, and said as-worn position, said connected zone being spaced apart in any direction towards an optical centre of said spectacle lens or a fitting of said spectacle lens from a simply connected zone by a first ring-shaped structure, said optical centre being defined as in ISO 13666:2019(E), entry 3.2.15, said fitting point being as defined in ISO 13666:2019(E), entry 3.2.34, said simply connected zone comprising said optical centre or said fitting point.

[0292] In particular, the kit comprises a spectacle lens and further data, said spectacle lens comprising the ring-shaped structure and a structure-freestructure-free simply connected zone, said further data comprising an eye model and an as-worn position as defined in ISO 13666:2019(E), entry 3.2.36, said kit being characterized in that a position of a second ring-shaped structure and a connected zone of said spectacle lens is in accordance with said further data such that a connected zone being limited by a ring-shaped onset line of a second ring-shaped structure, said ring-shaped onset line of said second ring-shaped structure having a convexity of below 1 , said ringshaped onset line of said second ring-shaped structure having at least one intersection with a projection of a perifoveal visual field onto a surface of said spectacle lens, said projection of said perifoveal visual field being defined with respect to said eye model comprising

[0293] - an optical axis of an eye,

[0294] - a distance from a pupil plane of said eye to an apex of a cornea of said eye along said optical axis, said distance being 2 mm,

[0295] - said perifoveal visual field being defined by a right circular double cone Cperifovea with an axis coinciding with said optical axis, an apex of said right circular double cone C erifovea being located at an intersection of said optical axis with said pupil plane having an apex angle aPerifovea, said apex angle Cperifovea being in a range of 17.5° to 18.5°, said apex angle Cperifovea being identical for said perifoveal visual field and said right circular double cone Cperifo ea, and said as-worn position, said connected zone being spaced apart in any direction towards an optical centre of said spectacle lens or a fitting of said spectacle lens from a simply connected zone by a first ring-shaped structure, said optical centre being defined as in ISO 13666:2019(E), entry 3.2.15, said fitting point being as defined in ISO 13666:2019(E), entry 3.2.34, said simply connected zone comprising said optical centre or said fitting point.

[0296] Preferably, the kit comprising the spectacle lens and further data, said spectacle lens comprising the ring-shaped structure and the simply connected zone, said further data comprising the eye model and the as-worn position as defined in ISO 13666:2019(E), entry 3.2.36, is characterized in that the spectacle lens of the kit comprises a plurality of structure-free simply connected zones, each structure- free simply connected zone of said plurality of structure-free simply connected zones a) being limited by a ring-shaped onset line of a ring-shaped structure and b) having no intersection with said connected zone limited by the onset line of the second ring-shaped structure.

[0297] With respect to the respective spectacle lens being part of the respective kit described before, reference is made to the description of the respective spectacle lens in the foregoing. With respect to the further data being the other part of the respective kit described before, reference is made to the explanation why said further data is part of the respective kit.

[0298] The data set comprises at least one of the following kinds of data:

[0299] (i) data of the spectacle lens described before, said data being configured for the purpose of a use for a manufacture of said spectacle lens,

[0300] (ii) data containing computer-readable instructions for controlling one manufacturing machine or more manufacturing machines in order to produce the spectacle lens described before, and

[0301] (iii) data of the spectacle lens described before, said data configured to be fed to one or more manufacturing machines for manufacturing the spectacle lens described before.

[0302] The data set comprises at least one of the following kinds of data:

[0303] (i) data of the kit described before, whereby data of the spectacle lens is configured for the purpose of a use for a manufacture of said spectacle lens,

[0304] (ii) data containing computer-readable instructions for controlling one manufacturing machine or more manufacturing machines in order to produce the spectacle lens described before,

[0305] (iii) data of the kit described before, whereby data of the spectacle lens is configured be fed to one or more manufacturing machines for manufacturing the spectacle lens comprised in the kit.

[0306] Preferably, the data comprised in each data set described before, is computer-readable data. Each data set described before may be stored on a computer-readable medium or carried by a data signal. The computer-readable medium may be a non-transitory tangible computer-readable storage medium. The method configured for calculating, by a computer, data of a spectacle lens for the purpose of a use of said data for a manufacture of the spectacle lens, is characterized in the step of

[0307] - determining a ring-shaped onset line of a ring-shaped structure on a surface of the spectacle lens such that said ring-shaped onset line is having more than eight intersections with a reference circle, said reference circle being centred at a centroid of said ring-shaped onset line, a radius of said reference circle being equal to a mean distance of said ring-shaped onset line to said centroid of said ring-shaped onset line, and a ratio between a maximal distance of said ring-shaped onset line to said centroid of said ring-shaped onset line and a minimal distance of said ring-shaped onset line to said centroid of said ring-shaped onset line is above a predefined threshold.

[0308] In particular, the method configured for calculating, by a computer, data of a spectacle lens (100, 200), said data of said spectacle lens being configured for the purpose of a use of said data for a manufacture of the spectacle lens, the method is characterized in the step of

[0309] - determining a ring-shaped onset line of a ring-shaped structure on a surface of the spectacle lens such that said ring-shaped onset line is having more than eight intersections with a reference circle, said reference circle being centred at a centroid of said ring-shaped onset line, a radius of said reference circle being equal to a mean distance of said ring-shaped onset line to said centroid of said ring-shaped onset line, and a ratio between a maximal distance of said ring-shaped onset line to said centroid of said ring-shaped onset line and a minimal distance of said ring-shaped onset line to said centroid of said ring-shaped onset line is above a predefined threshold, said predefined threshold is selected from at least one of the following threshold values:

[0310] - the ratio of said maximal distance to said minimal distance is above the predefined threshold of 2.0,

[0311] - the ratio of said maximal distance to said minimal distance is above the predefined threshold of 2.1 ,

[0312] - the ratio of said maximal distance to said minimal distance is above the predefined threshold of 2.2,

[0313] - the ratio of said maximal distance to said minimal distance is above the predefined threshold of 2.3 said ring-shaped onset line of said ring-shaped structure on said surface of said spectacle lens passes along each onset of said ring-shaped structure, each onset of said ring-shaped structure is a first position along any line from a centroid of said ring-shaped onset line of said ring-shaped structure towards a periphery of said ring-shaped onset line of said ring-shaped structure in which a surface of said ring-shaped structure differs in surface power from a surface of said spectacle lens comprising said ring-shaped structure.

[0314] Preferably, that said ring-shaped onset line surrounds at least one of i) the structure-free simply connected zone, ii) the optical centre of the spectacle lens or the fitting point of the spectacle lens, the optical centre as defined in ISO 13666:2019(E), entry 3.2.15, the fitting point as defined in ISO 13666:2019(E), entry 3.2.34.

[0315] The method being configured for calculating, by a computer, data of a spectacle lens forthe purpose of a use of said data for a manufacture of the spectacle lens, is characterized in the step of - determining an onset line of a second ring-shaped structure on a surface of the spectacle lens such that said onset line of said second ring-shaped structure is having more than one intersection with a projection of a perifoveal visual field onto a surface of said spectacle lens, said projection of said perifoveal visual field being defined with respect to

[0316] A) an eye model comprising

[0317] - an optical axis of an eye,

[0318] - a distance from a pupil plane of said eye to an apex of a cornea of said eye along said optical axis, said distance being 2 mm,

[0319] - said perifoveal visual field being defined by a right circular double cone Cperifovea with an axis coinciding with said optical axis, an apex of said right circular double cone C erifovea being located at an intersection of said optical axis with said pupil plane having said apex angle aPerifovea, said apex angle Qperifovea being in a range of 17.5° to 18.5°, said apex angle Qperifovea being identical for said perifoveal visual field and said right circular double cone Cperifovea, and

[0320] B) an as-worn position as defined in ISO 13666:2019(E), entry 3.2.36, comprising

[0321] - a vertex distance as defined in ISO 13666:2019(E), entry 3.2.40, said vertex distance being 12 mm,

[0322] - a primary direction as defined in ISO 13666:2019(E), entry 3.2.25,

[0323] - an as-worn pantoscopic angle as defined in ISO 13666:2019(E), entry 3.2.37, said as-worn pantoscopic angle being 0°,

[0324] - an as-worn face form angle as defined in ISO 13666:2019(E), entry 3.2.38, said as-worn face form angle being 0°.

[0325] In particular, method being configured for calculating, by a computer, data of a spectacle lens, said data of said spectacle lens being configured for the purpose of a use of said data for a manufacture of the spectacle lens, is characterized in the step of

[0326] - determining a ring-shaped onset line of a second ring-shaped structure on a surface of the spectacle lens such that said ring-shaped onset line of said second ring-shaped structure is having more than one intersection with a projection of a perifoveal visual field onto a surface of said spectacle lens, said ring-shaped onset line of said second ring-shaped structure having a convexity of below 1 , said projection of said perifoveal visual field being defined with respect to

[0327] A) an eye model comprising

[0328] - an optical axis of an eye,

[0329] - a distance from a pupil plane of said eye to an apex of a cornea of said eye along said optical axis, said distance being 2 mm,

[0330] - said perifoveal visual field being defined by a right circular double cone Cperifo ea with an axis coinciding with said optical axis, an apex of said right circular double cone C erifovea being located at an intersection of said optical axis with said pupil plane having said apex angle aPerifo ea, said apex angle Qperifovea being in a range of 17.5° to 18.5°, said apex angle Qperifovea being identical for said perifoveal visual field and said right circular double cone Cperifovea, and B) an as-worn position as defined in ISO 13666:2019(E), entry 3.2.36, comprising

[0331] - a vertex distance as defined in ISO 13666:2019(E), entry 3.2.40, said vertex distance being 12 mm,

[0332] - a primary direction as defined in ISO 13666:2019(E), entry 3.2.25,

[0333] - an as-worn pantoscopic angle as defined in ISO 13666:2019(E), entry 3.2.37, said as-worn pantoscopic angle being 0°,

[0334] - an as-worn face form angle as defined in ISO 13666:2019(E), entry 3.2.38, said as-worn face form angle being 0°.

[0335] Preferably, said ring-shaped onset line, i.e., the ring-shaped onset line of the second ring-shaped structure surrounds the optical centre of the spectacle lens or the fitting point of the spectacle lens, the optical centre as defined in ISO 13666:2019(E), entry 3.2.15, the fitting point as defined in

[0336] ISO 13666:2019(E), entry 3.2.34.

[0337] Preferably, said ring-shaped onset line, i.e., the ring-shaped onset line of the second ring-shaped structure limits in any direction towards the periphery of the spectacle lens the connected zone.

[0338] Preferably, said connected zone comprises at least one of at least one structure and at least one ringshaped structure.

[0339] Preferably, the simply connected zone is spaced apart from said connected zone by the first ringstructure.

[0340] The data of the spectacle lens, calculated by the computer, according to the respective method described before is data of the spectacle lens, said data of said spectacle lens is configured for the purpose of the use of the manufacture of the spectacle lens. Thus, preferably the data of the spectacle lens is the design data of the spectacle lens, said design data of said spectacle lens being configured for the purpose of the use of the manufacture of the spectacle lens.

[0341] The explanations provided above before with respect to the respective spectacle lens shall apply the respective method.

[0342] Preferably, the methods described before are further configured for manufacturing the spectacle lens based on the respective data of the spectacle lens. In other words, the method described before comprises the further step of manufacturing the spectacle lens based on the respective data of the spectacle lens.

[0343] The computer is configured to perform the step of

[0344] - determining a ring-shaped onset line of a ring-shaped structure on a surface of the spectacle lens such that said ring-shaped onset line is having more than eight intersections with a reference circle, said reference circle being centred at a centroid of said ring-shaped onset line, a radius of said reference circle being equal to a mean distance of said ring-shaped onset line to said centroid of said ring-shaped onset line, and a ratio between a maximal distance of said ring-shaped onset line to said centroid of said ring-shaped onset line and a minimal distance of said ring-shaped onset line to said centroid of said ring-shaped onset line is above a predefined threshold.

[0345] Preferably, said ring-shaped onset line surrounds at least one of

[0346] I) a simply connected zone, ii) an optical centre of the spectacle lens or a fitting point of the spectacle lens, the optical centre as defined in ISO 13666:2019(E), entry 3.2.15, the fitting point as defined in ISO 13666:2019(E), entry 3.2.34.

[0347] The computer is configured to perform the step of

[0348] - determining an onset line of a second ring-shaped structure on a surface of the spectacle lens such that said onset line of said second ring-shaped structure is having more than one intersection with a projection of a perifoveal visual field onto a surface of said spectacle lens, said projection of said perifoveal visual field being defined with respect to

[0349] A) an eye model comprising

[0350] - an optical axis of an eye,

[0351] - a distance from a pupil plane of said eye to an apex of a cornea of said eye along said optical axis, said distance being 2 mm,

[0352] - said perifoveal visual field being defined by a right circular double cone Cperitovea with an axis coinciding with said optical axis, an apex of said right circular double cone Cperifovea being located at an intersection of said optical axis with said pupil plane having said apex angle aperifovea, said apex angle C( perifovea being in a range of 17.5° to 18.5°, said apex angle aperifovea being identical for said perifoveal visual field and said right circular double cone Cperitovea, and

[0353] B) an as-worn position as defined in ISO 13666:2019(E), entry 3.2.36, comprising

[0354] - a vertex distance as defined in ISO 13666:2019(E), entry 3.2.40, said vertex distance being 12 mm,

[0355] - a primary direction as defined in ISO 13666:2019(E), entry 3.2.25,

[0356] - an as-worn pantoscopic angle as defined in ISO 13666:2019(E), entry 3.2.37, said as-worn pantoscopic angle being 0°,

[0357] - an as-worn face form angle as defined in ISO 13666:2019(E), entry 3.2.38, said as-worn face form angle being 0°.

[0358] Preferably, said ring-shaped onset line, i.e. the onset line of the second ring-shaped structure surrounds an optical centre of the spectacle lens or a fitting point of the spectacle lens, the optical centre as defined in ISO 13666:2019(E), entry 3.2.15, the fitting point as defined in

[0359] ISO 13666:2019(E), entry 3.2.34. In particular, the computer is configured to perform the method described before.

[0360] Preferably, said ring-shaped onset line, i.e., the onset line of the second ring-shaped structure limits in any direction towards a periphery of the spectacle lens a connected zone.

[0361] Preferably, said connected zone comprises at least one of at least one structure and at least one ringshaped structure.

[0362] Preferably, a structure-free simply connected zone is spaced apart from said connected zone by a first ring-structure.

[0363] The computer program comprises instructions which, when the program is executed by a computer, cause the computer to carry out the method described before.

[0364] The computer program may be stored on a non-transitory tangible computer-readable storage medium, the computer program comprising instructions which, when the program is executed by a computer, cause the computer to carry out the method described before.

[0365] The computer-readable storage medium has stored thereon the computer program mentioned before.

[0366] The computer-readable storage medium may be a non-transitory computer-readable storage medium.

[0367] The data signal carrying the computer program mentioned before.

[0368] A data processing system comprising a processor and a storage medium coupled to the processor, wherein the processor is adapted to perform the step of the method described before, based on a computer program stored on the storage medium.

[0369] The storage medium may be a non-transitory computer-readable storage medium.

[0370] Figure 1 shows spectacle lens 100 comprising the simply connected zone 101 which is limited by the rings-shaped onset line 102 of the ring-shaped structure.

[0371] Figure 2 shows the spectacle lens 200 comprising additionally to the simply connected zone 101 a plurality of simply connected zones 103. The simply connected zone 101 is limited by the ring-shaped onset line 102 of the ring-shaped structure.

[0372] Figure 3 shows the spectacle lens 300 comprising the simply connected zone 201 . The simply connected zone 201 is spaced apart by the second ring-shaped structure from the connected zone 204. The simply connected zone 201 is surrounded by the inner onset line 205 of the first ring-shaped structure. The connected zone 201 is surrounding the outer onset line 206 of the first ring-shaped structure.

[0373] Figure 4 shows the spectacle lens 400 comprising additionally to the simply connected zone 201 a plurality of simply connected zones 203. The simply connected zone 201 is spaced apart by the second ring-shaped structure from the connected zone 204. The simply connected zone 201 is surrounded by the inner onset line 205 of the first ring-shaped structure. The connected zone 201 is surrounding the outer onset line 206 of the first ring-shaped structure.

Claims

1 . Spectacle lens (100, 200) comprising a ring-shaped structure and a structure-free simply connected zone (101), said structure-free simply connected zone (101) comprising an optical centre of the spectacle lens or a fitting point of the spectacle lens, said optical centre being defined as in ISO 13666:2019(E), entry 3.2.15, said fitting point being as defined inISO 13666:2019(E), entry 3.2.34, said structure-free simply connected zone being limited by a ring-shaped onset line of said ring-shaped structure, said ring-shaped onset line of said ringshaped structure having a maximal distance to a centroid of said ring-shaped onset line, a minimal distance to said centroid of said ring-shaped onset line, and a mean distance to said centroid of said ring-shaped onset line, said ring-shaped onset line of said ring-shaped structure passes along each onset of said ringshaped structure, each onset of said ring-shaped structure is, along a perimeter of said structure- free simply connected zone, i) a first position along any line from said optical centre of said spectacle lens towards a periphery of said spectacle lens in which a surface of said ring-shaped structure differs in surface power from a surface of said spectacle lens comprising said ringshaped structure or ii) a first position along any line from said fitting point of said spectacle lens towards a periphery of said spectacle lens in which a surface of said ring-shaped structure differs in surface power from a surface of said spectacle lens comprising said ring-shaped structure, the spectacle lens being characterized in that a reference circle is having more than eight intersections with said ring-shaped onset line, said reference circle being centred at said centroid of said ring-shaped onset line, a radius of said reference circle being equal to said mean distance of said ring-shaped onset line to said centroid of said ring-shaped onset line, and a ratio between said maximal distance of said ring-shaped onset line to said centroid of said ring-shaped onset line and said minimal distance of said ring-shaped onset line to said centroid of said ring-shaped onset line is above a predefined threshold, said predefined threshold is selected from at least one of the following threshold values:- the ratio of said maximal distance to said minimal distance is above the predefined threshold of 2.0,- the ratio of said maximal distance to said minimal distance is above the predefined threshold of2.1 ,- the ratio of said maximal distance to said minimal distance is above the predefined threshold of2.2,- the ratio of said maximal distance to said minimal distance is above the predefined threshold of2.3,2. Spectacle lens (100, 200) according to claim 1 , characterized in that said structure free simply connected zone (101) has a surface area within at least one range of the group consisting of- a range of 22 mm2to 80 mm2- a range of 24 mm2to 75 mm2- a range of 26 mm2to 70 mm2- a range of 28 mm2to 65 mm2- a range of 30 mm2to 60 mm2.

3. Spectacle lens (100, 200) according to any one of the preceding claims, characterized in that said minimal distance of said ring-shaped onset line to said centroid of said ring-shaped onset line is within at least one range of the group consisting of- a range of 1 mm to 8 mm- a range of 1 .5 mm to 7 mm- a range of 2 mm to 6 mm- a range of 2.5 mm to 5 mm.

4. Spectacle lens (100, 200) according to any one of the preceding claims, characterized in that said spectacle lens comprises a plurality of structure-free simply connected zones (103), each structure-free simply connected zone of said plurality of structure-free simply connected zones (103) a) being limited by a ring-shaped onset line of a ring-shaped structure and b) having no intersection with said structure-free simply connected zone comprising the optical centre of the spectacle lens or the fitting point of the spectacle lens.

5. Spectacle lens (100, 200) according to preceding claim 4, characterized in that each structure- free simply connected zone of said plurality of structure-free simply connected zones (103) has a convexity below 1 .

6. Spectacle lens (100, 200) according to any one of the preceding claims 4 and 5, characterized in that a respective reference circle centred at a respective centroid of a respective structure-free simply connected zone of said plurality of structure-free simply connected zones (103) has a number of intersections with said respective ring-shaped onset line of said respective ring-shaped structure limiting each respective structure-free simply connected zone of said plurality of structure-free simply connected zones, said number of intersections with said respective ringshaped onset line of said respective ring-shaped structure limiting each respective structure-free simply connected zone of said plurality of structure-free simply connected zones being identical to a number of intersections of said reference circle centred at said centroid of said ring-shaped onset line of said structure-free simply connected zone (101) comprising said optical centre of said spectacle lens or said fitting point of said spectacle lens, said respective ring-shaped onset line of said respective ring-shaped structure limiting said respective structure-free simply connected zone of said plurality of simply connected zones (103) has a minimum distance to said respective centroid of said respective structure-free simply connected zone of said plurality of structure-free simply connected zones (103), a maximum distance to said respective centroid of said respective structure-free simply connected zone of said plurality of structure-free simply connected zones (103) and a mean distance to said respective centroid of said respective structure-free simply connected zone of said plurality of structure-free simply connected zones, said respective reference circle is centred at said respective centroid of said respective structure-free simply connected zone of said plurality ofstructure-free simply connected zones (103), said respective reference circle has a radius equal to said respective mean distance.

7. Spectacle lens (100, 200) according to any one of the preceding claims 4 to 6, characterized in that, a ratio of said maximal distance to said minimal distance of said respective centroid to said respective ring-shaped onset line of said respective ring-shaped structure limiting each structure- free simply connected zone of said plurality of simply connected zones (103) is identical to said ratio between said maximal distance to said minimal distance of said ring-shaped onset line of said ring-shaped structure limiting said structure-free simply connected zone (101) comprising said optical centre of the spectacle lens or said fitting point of said spectacle lens.

8. Spectacle lens (300, 400) comprising a ring-shaped structure and a connected zone (204), said spectacle lens comprising an optical centre of the spectacle lens or a fitting point of the spectacle lens, said optical centre being defined as in ISO 13666:2019(E), entry 3.2.15, said fitting point being as defined in ISO 13666:2019(E), entry 3.2.34, said connected zone being limited in any direction towards to a periphery of said spectacle lens by a ring-shaped onset line of said ring-shaped structure, said ring-shaped onset line of said ring-shaped structure passes along each onset of said ringshaped structure, each onset of said ring-shaped structure is, along a perimeter of said connected zone, i) a first position along any line from said optical centre of said spectacle lens towards a periphery of said spectacle lens in which a surface of said ring-shaped structure differs in surface power from a surface of said spectacle lens comprising said ring-shaped structure or ii) a first position along any line from said fitting point of said spectacle lens towards a periphery of said spectacle lens in which a surface of said ring-shaped structure differs in surface power from a surface of said spectacle lens comprising said ring-shaped structure, said ring-shaped onset line of said ring-shaped structure having a convexity of below 1 , the spectacle lens being characterized in that said connected zone surrounds said optical centre or said fitting point, and a projection of a perifoveal visual field onto a surface of said spectacle lens is having at least one intersection with said ring-shaped onset line of said ring-shaped structure, said perifoveal visual field is having an apex angle ctperifovea in a range of 17.5° to 18.5°, said projection of said perifoveal visual field being defined with respect to A) an eye model comprising- an optical axis of an eye,- a distance from a pupil plane of said eye to an apex of a cornea of said eye along said optical axis, said distance being 2 mm,- said perifoveal visual field being defined by a right circular double cone Cperifovea with an axis coinciding with said optical axis, an apex of said right circular double cone Cperifovea being located at an intersection of said optical axis with said pupil plane having said apex angle ct erifovea, said apex angle Ctperifovea being identical for said perifoveal visual field and said right Circular double COne Cperifovea,andB) an as-worn position as defined in ISO 13666:2019(E), entry 3.2.36, comprising- a vertex distance as defined in ISO 13666:2019(E), entry 3.2.40, said vertex distance being 12 mm,- a primary direction as defined in ISO 13666:2019(E), entry 3.2.25,- an as-worn pantoscopic angle as defined in ISO 13666:2019(E), entry 3.2.37, said as-worn pantoscopic angle being 0°,- an as-worn face form angle as defined in ISO 13666:2019(E), entry 3.2.38, said as-worn face form angle being 0°.

9. Spectacle lens (300, 400) according to claim 8, characterized in that said connected zone surrounds at least one of at least one structure and at least one ring-shaped structure.

10. Spectacle lens (300, 400) according to any one of preceding claims 8 and 9, characterized in that the spectacle lens comprises a plurality of structure-free simply connected zones (203), each structure-free simply connected zone of said plurality of structure-free simply connected zones (203) a) being limited by a ring-shaped onset line of a ring-shaped structure and b) having no intersection with said connected zone limited in any direction towards to the periphery of said spectacle lens by the ring-shaped onset line of said ring-shaped structure.11 . Spectacle lens (300, 400) according to any one of preceding claims 8 to 10, characterized in that a ratio of a maximal distance of a centroid of said ring-shaped onset line of said ring-shaped structure to a minimal distance of said centroid of said ring-shaped onset line of said ring-shaped structure is selected from one of the following:- said ratio of said maximal distance to said minimal distance is above 2.0,- said ratio of said maximal distance to said minimal distance is above 2.1 ,- said ratio of said maximal distance to said minimal distance is above 2.2,- said ratio of said maximal distance to said minimal distance is above 2.

312. Spectacle lens (300, 400) comprising a ring-shaped structure and a structure-free simply connected zone (201), the spectacle lens being characterized in that said structure-free simply connected zone comprises an optical centre or a fitting point, said optical centre being defined as in ISO 13666:2019€, entry 3.2.15, said fitting point being as defined in ISO 13666:2019(E), entry 3.2.34, said structure-free simply connected zone (201) is spaced apart in any direction towards a periphery of said spectacle lens from a connected zone (204) by a first ring-shaped structure, said connected zone being limited by a ring-shaped onset line of a second ring-shaped structure, said ring-shaped onset line of said second ring-shaped structure having a convexity of below 1 ,said ring-shaped onset line of said second ring-shaped structure having at least one intersection with a projection of a perifoveal visual field onto a surface of said spectacle lens, said projection of said perifoveal visual field being defined with respect toA) an eye model comprising- an optical axis of an eye,- a distance from a pupil plane of said eye to an apex of a cornea of said eye along said optical axis, said distance being 2 mm,- said perifoveal visual field being defined by a right circular double cone C erifovea with an axis coinciding with said optical axis, an apex of said right circular double cone Cperifovea being located at an intersection of said optical axis with said pupil plane having an apex angle ctpenfovea, said apex angle Clperifovea being in a range of 17.5° to 18.5°, said apex angle Cperifovea being identical for said perifoveal visual field and said right circular double cone Cperifovea, andB) an as-worn position as defined in ISO 13666:2019(E), entry 3.2.36, comprising- a vertex distance as defined in ISO 13666:2019(E), entry 3.2.40, said vertex distance being 12 mm,- a primary direction as defined in ISO 13666:2019(E), entry 3.2.25,- an as-worn pantoscopic angle as defined in ISO 13666:2019(E), entry 3.2.37, said as-worn pantoscopic angle being 0°,- an as-worn face form angle as defined in ISO 13666:2019(E), entry 3.2.38, said as-worn face form angle being 0°.

13. Spectacle lens (300, 400) according to claim 12, characterized in that the spectacle lens comprises a plurality of structure-free simply connected zones (203), each structure-free simply connected zone of said plurality of structure-free simply connected zones (203) a) being limited by a ring-shaped onset line of a ring-shaped structure and b) having no intersection with said connected zone limited by the onset line of the second ringshaped structure.

14. Kit comprising a spectacle lens (300, 400) and further data, said spectacle lens comprising an optical centre of the spectacle lens or a fitting point of the spectacle lens, said optical centre being defined as in ISO 13666:2019(E), entry 3.2.15, said fitting point being as defined in ISO 13666:2019(E), entry 3.2.34, said spectacle lens comprising a ring-shaped structure and a connected zone (204), said connected zone being limited in any direction towards to a periphery of said spectacle lens by a ring-shaped onset line of said ring-shaped structure, said ring-shaped onset line of said ringshaped structure having a convexity of below 1 , said further data comprising- an eye model and- an as-worn position as defined in ISO 13666:2019(E), entry 3.2.36,said kit being characterized in that a position of said ring-shaped structure and said connected zone of said spectacle lens of said kit is in accordance with said further data of said kit such that a projection of a perifoveal visual field onto a surface of said spectacle lens is having at least one intersection with said ring-shaped onset line of said ring-shaped structure, said perifoveal visual field is having an apex angle aPerifovea in a range of 17.5° to 18.5°, said ring-shaped onset line of said ring-shaped structure is surrounding said optical centre or said fitting point, said projection of said perifoveal visual field being defined with respect to said eye model comprising- an optical axis of an eye,- a distance from a pupil plane of said eye to an apex of a cornea of said eye along said optical axis, said distance being 2 mm,- said perifoveal visual field being defined by a right circular double cone Cperifovea with an axis coinciding with said optical axis, an apex of said right circular double cone Cperifovea being located at an intersection of said optical axis with said pupil plane having said apex angle ctperifo ea, said apex angle Ctperifovea being identical for said perifoveal visual field and said right Circular double COne Cperifovea, and said as-worn position.

15. Kit according to claim 14, characterized in that said ring-shaped onset line of said ring-shaped structure of said spectacle lens (300, 400) surrounds at least one of at least one structure and at least one ring-shaped structure.

16. Kit according to any one of preceding claims 14 and 15, characterized in that said spectacle lens (100, 200, 300, 400) of the kit comprises a plurality of structure-free simply connected zones (203), each structure-free simply connected zone of said plurality of structure-free simply connected zones (203) a) being limited by a ring-shaped onset line of a ring-shaped structure and b) having no intersection with said connected zone limited in any direction towards to the periphery of said spectacle lens by the ring-shaped onset line of said ring-shaped structure.

17. Kit comprising a spectacle lens (300, 400) and further data, said spectacle lens comprising a ring-shaped structure and a structure-free simply connected zone (201), said further data comprising an eye model and an as-worn position as defined inISO 13666:2019(E), entry 3.2.36, said kit being characterized in that a position of a second ring-shaped structure and a connected zone (204) of said spectacle lens of said kit is in accordance with said further data of said kit such that said connected zone being limited by a ring-shaped onset line of said second ring-shaped structure, said ring-shaped onset line of said second ring-shaped structure having a convexity of below 1 ,said ring-shaped onset line of said second ring-shaped structure having at least one intersection with a projection of a perifoveal visual field onto a surface of said spectacle lens, said projection of said perifoveal visual field being defined with respect to said eye model comprising- an optical axis of an eye,- a distance from a pupil plane of said eye to an apex of a cornea of said eye along said optical axis, said distance being 2 mm,- said perifoveal visual field being defined by a right circular double cone Cpenfovea with an axis coinciding with said optical axis, an apex of said right circular double cone Cpenfovea being located at an intersection of said optical axis with said pupil plane having an apex angle aPerifo ea, said apex angle □perifovea being in a range of 17.5° to 18.5°, said apex angle C( perifovea being identical for said perifoveal visual field and said right circular double cone Cpenfovea, and said as-worn position, said connected zone being spaced apart in any direction towards an optical centre of said spectacle lens or a fitting of said spectacle lens from the simply connected zone by a first ringshaped structure, said optical centre being defined as in ISO 13666:2019(E), entry 3.2.15, said fitting point being as defined in ISO 13666:2019(E), entry 3.2.34, said simply connected zone comprising said optical centre or said fitting point.

18. Kit according to claim 17, characterized in that said spectacle lens (300, 400) of the kit comprises a plurality of simply connected zones (203), each structure-free simply connected zone of said plurality of structure-free simply connected zones (203) a) being limited by a ring-shaped onset line of a ring-shaped structure and b) having no intersection with said connected zone limited by the onset line of the second ringshaped structure.

19. Data set comprising at least one of the following kinds of data:(i) data of the spectacle lens (100, 200, 300, 400) according to any one of the preceding claims 1 to 13, said data being configured for the purpose of a use for a manufacture of said spectacle lens,(ii) data containing computer-readable instructions for controlling one manufacturing machine or more manufacturing machines in order to produce the spectacle lens (100, 200, 300, 400) according to any one of the preceding claims 1 to 13.

20. Data set comprising at least one of the following kinds of data:(i) data of the kit according to any of the preceding claims 14 to 18, whereby data of the spectacle lens (100, 200, 300, 400) is configured for the purpose of a use for a manufacture of said spectacle lens,(ii) data containing computer-readable instructions for controlling one manufacturing machine or more manufacturing machines in order to produce the spectacle lens (100, 200, 300, 400) according to any one of the preceding claims 14 to 18.21 . Method being configured for calculating, by a computer, data of a spectacle lens (100, 200), said data of said spectacle lens being configured for the purpose of a use of said data for a manufacture of the spectacle lens, the method being characterized in the step of- determining a ring-shaped onset line of a ring-shaped structure on a surface of the spectacle lens such that said ring-shaped onset line is having more than eight intersections with a reference circle, said reference circle being centred at a centroid of said ring-shaped onset line, a radius of said reference circle being equal to a mean distance of said ring-shaped onset line to said centroid of said ring-shaped onset line, and a ratio between a maximal distance of said ring-shaped onset line to said centroid of said ring-shaped onset line and a minimal distance of said ring-shaped onset line to said centroid of said ring-shaped onset line is above a predefined threshold, said predefined threshold is selected from at least one of the following threshold values:- the ratio of said maximal distance to said minimal distance is above the predefined threshold of 2.0,- the ratio of said maximal distance to said minimal distance is above the predefined threshold of2.1 ,- the ratio of said maximal distance to said minimal distance is above the predefined threshold of2.2,- the ratio of said maximal distance to said minimal distance is above the predefined threshold of2.3 said ring-shaped onset line of said ring-shaped structure on said surface of said spectacle lens passes along each onset of said ring-shaped structure, each onset of said ring-shaped structure is a first position along any line from a centroid of said ring-shaped onset line of said ring-shaped structure towards a periphery of said ring-shaped onset line of said ring-shaped structure in which a surface of said ring-shaped structure differs in surface power from a surface of said spectacle lens comprising said ring-shaped structure.

22. Method according to claim 21 , characterized in that said ring-shaped onset line surrounds at least one of i) a structure-free simply connected zone, ii) an optical centre of the spectacle lens or a fitting point of the spectacle lens, the optical centre as defined in ISO 13666:2019(E), entry 3.2.15, the fitting point as defined inISO 13666:2019(E), entry 3.2.34.

23. Method being configured for calculating, by a computer, data of a spectacle lens (300, 400), said data of said spectacle lens being configured for the purpose of a use of said data for a manufacture of the spectacle lens, the method being characterized in the step of- determining a ring-shaped onset line of a second ring-shaped structure on a surface of the spectacle lens such that said ring-shaped onset line of said second ring-shaped structure is having more than one intersection with a projection of a perifoveal visual field onto a surface of said spectacle lens, said ring-shaped onset line of said second ring-shaped structure having a convexity of below 1 , said projection of said perifoveal visual field being defined with respect toA) an eye model comprising- an optical axis of an eye,- a distance from a pupil plane of said eye to an apex of a cornea of said eye along said optical axis, said distance being 2 mm,- said perifoveal visual field being defined by a right circular double cone Cpenfo ea with an axis coinciding with said optical axis, an apex of said right circular double cone Cperifovea being located at an intersection of said optical axis with said pupil plane having said apex angle ctperifovea, said apex angle Ctperifovea being in a range of 17.5° to 18.5°, said apex angle Ctperifovea being identical for said perifoveal visual field and said right circular double cone Cperifovea, andB) an as-worn position as defined in ISO 13666:2019(E), entry 3.2.36, comprising- a vertex distance as defined in ISO 13666:2019(E), entry 3.2.40, said vertex distance being 12 mm,- a primary direction as defined in ISO 13666:2019(E), entry 3.2.25,- an as-worn pantoscopic angle as defined in ISO 13666:2019(E), entry 3.2.37, said as-worn pantoscopic angle being 0°,- an as-worn face form angle as defined in ISO 13666:2019(E), entry 3.2.38, said as-worn face form angle being 0°.

24. Method according to claim 23, characterized in that said ring-shaped onset line of said second ring-shaped structure surrounds an optical centre of the spectacle lens or a fitting point of the spectacle lens, the optical centre as defined in ISO 13666:2019(E), entry 3.2.15, the fitting point as defined in ISO 13666:2019(E), entry 3.2.34.

25. Method according to any one of preceding claims 23 and 24, characterized in that said ringshaped onset line of said second ring-shaped structure limits in any direction towards a periphery of the spectacle lens a connected zone (204).

26. Method according to preceding claim 25, characterized in that said connected zone (204) comprises at least one of at least one structure and at least one ring-shaped structure.

27. Method according to claim 23, characterized in that a structure-free simply connected zone (201) is spaced apart from said connected zone (204) by a first ring-structure.

28. Method according to any one of preceding claims 21 to 27 being further configured for manufacturing the spectacle lens based on the data of the spectacle lens (100, 200, 300, 400).

29. Computer being configured to perform the method according to any one of the preceding claims 21 to 27.

30. Computer program comprising instructions which, when the program is executed by a computer, cause the computer to carry out the method according to any one of the preceding claims 21 to 27.31 . Computer-readable storage medium having stored thereon the computer program of claim 30.

32. Data signal carrying the computer program of claim 30.

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