Spectacle lens for myopia management having a continuous reticulate active structure

Abstract

The invention relates to a spectacle lens which produces a primary effect and additionally has a specially structured functional region in which an anti-myopia effect is produced in addition to the primary effect. For this purpose, the spectacle lens (10) comprises: a central main viewing region (12) having the primary optical effect and a functional region adjoining the main viewing region (12), which functional region comprises: a plurality of peripheral transparent zones (14), which produce the primary optical effect, and a continuous reticulate active structure (16), which separates the plurality of peripheral transparent zones both from one another and from the main viewing region and produces an anti-myopia effect.

Description

[0001] EYEGLASS LENS FOR MYOPIA MANAGEMENT WITH A NET-SIZED, INTERCONNECTED ACTIVITY STRUCTURE

[0002] The invention relates to a spectacle lens which produces a basic effect and also has a specially structured functional area in which, in addition to the basic effect, a myopia-stopping effect is generated, in particular in the form of a shortened focal length and / or in the form of absorption and / or scattering. The special structuring of the functional area, consisting of separate clear vision zones and an intervening, interconnected, net-like effect structure, achieves a particularly good balance between the lens's comfort and effectiveness in suppressing myopia progression.

[0003] Especially with spectacle lenses for the correction of myopia, the often noticeable tendency of myopia progression leads to a decrease in the wearing comfort of once fitted spectacle lenses, and thus also in the satisfaction of the spectacle wearer and the tolerability of the glasses, after a short time.

[0004] Myopia typically develops due to abnormal elongation of the eye in children and adolescents, leading to severe nearsightedness. This is often caused by a modern lifestyle (little time spent outdoors and much close-up work). Myopia is increasing dramatically worldwide, particularly in Asia. The WHO estimates that over 50% of the world's population will be myopic by 2050. As myopia increases in individuals, so does the risk of related eye diseases such as retinal detachment, glaucoma, cataracts, and macular degeneration.

[0005] Therefore, there is great interest in slowing the progression of myopia. Several approaches exist to slow myopia progression using optical aids (visual aids). To date, various optical effects regarding the tolerability and comfort of ophthalmic lenses, particularly spectacle lenses, have been investigated with respect to their influence on myopia and / or hyperopia, as well as their progression or development, depending on the optical and physiological mechanisms that are intended to explain or slow down progression, especially worsening.

[0006] Many existing approaches essentially rely on wearing special lenses for myopia control. These lenses attempt to shift the focal plane of the visual field in the periphery in front of the retina, thereby slowing the elongation of the eye. One variant of these lenses has numerous small, individual corrective elements, particularly in the form of additional lenses (lenslets or rings), distributed across the peripheral area of ​​the lens, creating a second focal plane in front of the retina (e.g., CN 104678572 B, US 10268050 B2, WO 2019 / 166653 A1, US 8950860 B2, US 10901237 B2, US 11061255 B2). The entire contiguous area between the additional lenses typically provides the regular effect for sharp image formation on the retina.The individual lens elements are chosen to be so small that, with typical pupil sizes, at least some of the incoming light, when looking through the periphery of the lens, does not fall into these areas, but only into the space between the lens elements. This allows for at least partially sharp, albeit qualitatively reduced, vision in the peripheral area. In this peripheral area, the desire for sharp image quality to increase immediate, short-term wearing comfort and the safety of the lens, on the one hand, and the myopia-stopping effect to suppress or reduce the progression of myopia, on the other, are in conflict. This conflict must be resolved through a suitable compromise, particularly through the appropriate selection of the size, density, and distribution of the lenslets.

[0007] The object of the present invention is to improve the long-term tolerability of spectacles and thus achieve long-term and high wearing comfort with simultaneously improved perception. This object is achieved according to the invention by a spectacle lens with the features specified in claim 1. Preferred embodiments are the subject of the dependent claims.

[0008] Insofar as the required or desirable properties described here preferably relate to a finished spectacle lens, these properties, or at least some of them, may already be realized in a spectacle lens blank. Therefore, unless otherwise specified, the term "spectacle lens" will hereinafter also refer to a spectacle lens blank. A spectacle lens blank can, for example, be understood as the direct product of a casting process. The finished spectacle lens can then be produced from the spectacle lens blank through further processing, e.g., by coating (e.g., with a protective layer or the like), which covers a surface structure described here, so that this structure is then present at an interface (i.e.,in particular a material transition between a spectacle lens main body - corresponding to the original blank - and the coating) within the spectacle lens, even if this structure was still on the surface of the spectacle lens blank.

[0009] Thus, in one aspect, the invention provides a spectacle lens comprising a central main viewing area with a basic optical effect and a functional area adjacent to the main viewing area as part of a viewing area of ​​the spectacle lens. The functional area comprises (or is particularly formed by) a plurality of peripheral clear viewing zones exhibiting the basic optical effect, and a network-like, interconnected effect structure that separates the plurality of peripheral clear viewing zones both from each other and from the main viewing area, thereby generating a myopia-stopping effect.

[0010] In other words, the main viewing area and the peripheral clear vision zones of the functional area form individual islands of good vision, separated from each other by the interconnected, network-like effect structure (hereinafter also referred to as the network structure). The central main viewing area serves, in particular, to ensure the most undisturbed and sharp possible imaging of foveal vision when looking through the lens in a primary direction.

[0011] The interconnected, network-like structure of the lens, however, leads to a lower (or perceived lower) visual acuity in the periphery of the lens compared to the central main viewing area. This reduction in peripheral visual acuity can be achieved, in particular, through at least partial defocusing and / or absorption and / or scattering of light. When such a lens is used, especially for a myopic eye, further excessive elongation of the eye is suppressed or dampened, thus slowing the progression of myopia.

[0012] In the inventive structuring of the functional area with separate islands that produce a sharp image and the extended effect structure in between that produces the myopia stopping effect, the role distribution of the surfaces is exactly reversed compared to conventional lenslets.

[0013] In particular, it was found within the scope of the present invention that a distribution of optical properties in which individual clear vision zones are separated from one another by a network-like, continuous effect structure (i.e., essentially no continuous clear vision zone is provided in the peripheral area of ​​the spectacle lens), while the effect structure continuously fills the (entire) area between the clear vision zones as a network-like structure, achieves a particularly good ratio between the effectiveness of the myopia-stopping effect (i.e., the dampening of further excessive elongation of the eye) and the tolerability of the spectacle lens. Within the scope of the present invention, this finding can be explained, at least in part, by the following:This can be attributed to the fact that the clear vision zones, as compact individual surfaces, result in an imaging behavior at the limit of the resolving power, based on a predetermined area ratio between areas of clear vision and areas with an effective structure. This behavior is particularly similar to an undisturbed view (i.e., also a view through the central main viewing area) with regard to the directional distribution, namely, it is comparatively isotropic. This is particularly evident in the nearly isotropic point spread function of the image of a spectacle lens with the distribution of the effective structure and the clear vision zones according to the invention, even in the peripheral area of ​​the spectacle lens.

[0014] In conventional lenses with lenslets to create myopia correction, the myopia-correcting areas dominate the overall structure, while the areas of good vision are secondary and therefore exhibit a disordered structure. This results in a significant degradation of the image quality in the eye, defined as the point spread function (PSF), which is determined when looking through the peripheral zone considering only the areas of good vision with a defined pupil. In such conventional lenses, this degradation is compared to looking through a lens without myopia correction.

[0015] Within the scope of this invention, the term "basic optical effect" refers in particular to an optical effect of the spectacle lens which, with regard to its spherical effect component, deviates from a predetermined value (in particular its mean value) by no more than approximately 0.5 diopters, preferably no more than approximately 0.25 diopters, and most preferably no more than approximately 0.125 diopters. Thus, the spherical effect varies within the central main viewing area and the peripheral clear vision zones by no more than approximately 1 diopter, preferably no more than approximately 0.5 diopters, and most preferably no more than approximately 0.125 diopters. The basic optical effect serves in particular to compensate for a (especially myopic) refractive error in the eye of a spectacle wearer.

[0016] Preferably, the myopia-stopping effect includes: a positive dioptric additional effect compared to the optical effect

[0017] Basic effect; and / or a reduction in contrast (compared to the basic optical effect), in particular higher absorption and / or scattering than in the main viewing area and in the peripheral clear viewing zones.

[0018] In particular, a purely spherical additional effect and / or an effective or medium spherical additional effect can be implemented as a positive dioptric effect compared to the basic optical effect, resulting from a cylindrical additional effect through the effect structure.

[0019] Preferably, the central main viewing area comprises a surface containing a circle with a diameter of at least approximately 4 mm, preferably at least approximately 5 mm, more preferably at least approximately 6 mm, further preferably at least approximately 8 mm, and most preferably at least approximately 10 mm. Alternatively or additionally, the central main viewing area preferably lies within a circle with a diameter of no more than approximately 20 mm, more preferably no more than approximately 15 mm, particularly preferably no more than approximately 12 mm, and most preferably no more than approximately 10 mm. A correspondingly dimensioned main viewing area, which is free of structures with a myopia-stopping effect, can thus ensure sharp perception of foveal vision during central gaze with a sufficient field of view for good tolerability of the glasses and a high level of safety for the wearer.

[0020] The functional area, which is particularly adjacent to the central main viewing area, can achieve an effective myopia-stopping effect. It is not necessary for the functional area to extend to the edge of the lens. In fact, it can even be advantageous to provide the functional area only in a central peripheral viewing angle range and to include an area without myopia-stopping effect towards the edge of the lens. This can improve not only wearing comfort but also the safety of the wearer, enabling them to perceive and recognize obstacles located or appearing in the outer peripheral area more reliably. Thus, in a preferred embodiment, the functional area lies within a circle with a diameter of no more than approximately 70 mm, preferably no more than approximately 60 mm, and even more preferably no more than approximately 50 mm.

[0021] Alternatively or additionally, there are supplementary main viewing areas that are free from myopia correction. These can, for example, include a reading zone within the lens, which is positioned below the central main viewing area and takes convergence into account. Such a zone increases wearing comfort, especially when reading.

[0022] Preferably, the interconnected, network-like functional structure comprises a plurality of webs and nodes such that each web separates two adjacent clear-viewing zones or a clear-viewing zone and the central main viewing area, and at least two (preferably at least three) webs meet at each node. In other words, the webs, which connect at each of their two ends (i.e., at the nodes) to at least one (preferably at least two) further web(s), form a meshed network. Essentially, each mesh of this network forms either one of the peripheral clear-viewing zones or the central main viewing area. Preferably, the webs connect each pair of nodes (essentially) in a straight line.

[0023] Preferably, the width of the webs (and thus the distance between adjacent clear viewing zones) is in the range of no more than about 5 mm, preferably no more than about 3 mm, even more preferably no more than about 2 mm, further preferably no more than about 1 mm, and most preferably no more than about 0.5 mm. Alternatively or additionally, the width of the webs (and thus the distance between adjacent clear viewing zones) is preferably in the range of at least about 0.05 mm, preferably at least about 0.1 mm, even more preferably at least about 0.2 mm, further preferably at least about 0.3 mm, and most preferably at least about 0.5 mm.

[0024] In a preferred embodiment, the width of each bridge between its nodes is essentially constant. "Essentially constant" here means, in particular, that the width of the respective bridge between the nodes varies by no more than about 20%, preferably no more than about 10%, more preferably no more than about 5%, and most preferably no more than about 2%. Particularly preferably, the myopia-stopping effect generated along the bridge between the nodes is essentially constant for each bridge, and is especially designed as a cylindrical additional effect.

[0025] The bridges between the nodes are particularly preferably designed as refractive elements to generate an additional cylindrical refractive power, which provides the myopia stopping power. In particular, the cross-section of the bridges between the respective nodes is essentially constant along their longitudinal extent, perpendicular to the longitudinal extent. In a preferred embodiment, the additional cylindrical effect of the bridges is in a range of at least approximately 0.5 diopters, preferably at least approximately 1 diopter, more preferably at least approximately 2 diopters, and more preferably at least approximately 5 diopters, and / or in a range of no more than approximately 10 diopters, preferably no more than approximately 8 diopters, and more preferably no more than approximately 5 diopters.

[0026] Preferably, the multitude of peripheral clear viewing zones comprises at least about 10, preferably at least about 25, and even more preferably at least about 50 peripheral clear viewing zones. These clear viewing zones are separated from each other and from the central main viewing area by the network structure (network-like, interconnected functional structure).

[0027] Preferably, the area ratio of each of the peripheral clear-viewing zones compared to the central main viewing area is in the range of no more than about 1 / 10, preferably no more than about 1 / 25, even more preferably no more than about 1 / 50, and further preferably no more than about 1 / 100.

[0028] Preferably, each of the multiple peripheral clear vision zones lies within a circular area with a diameter of no more than approximately 5 mm, preferably no more than approximately 3 mm, more preferably no more than approximately 2 mm, and further preferably no more than approximately 1 mm. This ensures that when looking through the spectacle lens, the peripheral clear vision zones are no longer perceived as individual areas of clear vision; rather, light beams that simultaneously pass through the entrance pupil of the eye, due to sufficiently small clear vision zones, generally also contain light that has passed through the intervening network structure with its myopia-stopping effect.Alternatively or additionally, each of the multiple peripheral clear-view zones to ensure sufficient peripheral clear view preferably comprises a surface (having the basic effect) containing a circular area with a diameter of at least about 0.02 mm, preferably at least about 0.05 mm, more preferably at least about 0.1 mm, further preferably at least about 0.2 mm, particularly preferably at least about 0.5 mm, most preferably at least about 1 mm.

[0029] In a preferred embodiment, for each peripheral clear-viewing zone, the ratio between the diameter of the smallest circle that completely contains the respective clear-viewing zone and the largest circle that lies completely within the respective clear-viewing zone is not greater than about 3, preferably not greater than about 2.5, more preferably not greater than about 2, further preferably not greater than about 1.5, and most preferably not greater than about 1.3. In other words, the peripheral clear-viewing zones are preferably compact in shape, i.e., they do not have any long extensions within them. With this compact shape, a particularly isotropic imaging behavior is observed at the resolution limit, in particular a particularly isotropic point spreading function. For example, a square clear-viewing zone results in a circumcircle to incircle diameter ratio of about 1.4, which already leads to a fairly compact area with good imaging behavior.For a regular hexagon, this ratio is only about 1.15.

[0030] Preferably, the peripheral clear vision zones are convex. This is achieved in particular if the interior angles of the meshes at which the webs meet at the nodes are no greater than approximately 180°, preferably no greater than approximately 150°, and even more preferably no greater than approximately 130°. Preferably, within the functional area, the ratio of the area occupied by the active structure to the area occupied by the peripheral clear vision zones is at least approximately 5%, preferably at least approximately 10%, even more preferably at least approximately 20%, particularly preferably at least approximately 30%, and / or no more than approximately 90%, preferably no more than approximately 80%, even more preferably no more than approximately 70%, and most preferably no more than approximately 60%. With such area proportions, a good balance between sharp vision and myopia correction can be achieved.Preferably, the ratio of the area of ​​the active structure to the area of ​​the peripheral clear vision zones can be approximately 1:19 to approximately 1:4, and more preferably approximately 1:9 to 1:5. An advantage of a lower ratio, in particular, is the improved tolerability of the lenses. Wearing comfort is higher due to better contrast, and thus also user acceptance, leading to longer wearing times and therefore improved efficacy. This has a positive effect on slowing the progression of myopia.

[0031] Preferably, the areas of the peripheral clear-view zones within the functional area are substantially equal. Essentially equal areas of the peripheral clear-view zones within the functional area means, in particular, that the areas deviate from the mean area by no more than about 10%, preferably no more than about 5%, and even more preferably no more than about 3%, and / or that the standard deviation of the areas is no greater than about 10%, preferably no greater than about 5%, and even more preferably no greater than about 3%, and most preferably no greater than about 2% of the mean area.

[0032] Particularly preferred are the peripheral clear-view zones arranged in such a regular manner that the geometric centers of all peripheral clear-view zones within the functional area lie essentially on a regular arrangement, wherein this regular arrangement is in particular a square arrangement, a (regular) hexagonal arrangement, or a Fibonacci sphere distribution. It is precisely such a regular arrangement, which allows peripheral clear-view zones with essentially equal areas and essentially constant widths of the webs to form the network structure, that enables a particularly isotropic point spreading function and thus good imaging performance to be achieved. This is especially true, for example, with a Fibonacci sphere distribution.

[0033] Preferably, the (network-like) effect structure comprises a photochromic material or consists of a photochromic material. In other words, the effect structure can be formed from a material comprising a polymer and one or more photochromic dyes. The mixture of polymer and photochromic dyes can be referred to as a photochromic material. Preferably, the effect structure can be formed by casting or 3D printing, or by coating or spin coating followed by material removal. The additional effect is advantageously particularly effective in enclosed spaces where the eye is especially at risk of myopia due to increased near vision. Outdoors, this additional effect is not strictly necessary and can be replaced by the protective effect of the darkening of the glass.Furthermore, structured darkening is advantageously another mechanism for slowing down eye growth.

[0034] It is understood that the advantages of using a photochromic material for the effect structure can also be achieved by a spectacle lens with the following properties: a central main viewing area with a basic optical effect and a functional area adjacent to the main viewing area, which includes: a multitude of peripheral clear vision zones which have the basic optical effect, and an effect structure which separates the multitude of peripheral clear vision zones both from each other and from the main viewing area and generates a myopia stopping effect, wherein the effect structure has or consists of a photochromic material.

[0035] In this case, the functional structure can also be non-connected, e.g., consisting of several island-shaped or spaced-apart areas. It is understood that the further properties and advantages of the features and benefits described above also apply to this variant, in particular all features defined in claims 2 to 15 and the accompanying description.

[0036] The invention is further described below with reference to additional aspects of preferred embodiments and the accompanying drawings. These drawings show:

[0037] Fig. 1 shows a schematic representation of a spectacle lens according to a preferred embodiment of the invention;

[0038] Fig. 2 shows a schematic 3D view of the arrow height of a surface or

[0039] Interface of a spectacle lens with a refractive mesh structure according to a preferred embodiment of the invention;

[0040] Figs. 3A-3C schematic representations of the point spreading functions for the zones of undisturbed vision for a spectacle lens without additional effect (Fig. 3A), with lenslets in hexagonal arrangement (Fig. 3B) and for a hexagonal mesh structure according to a preferred embodiment of the invention (Fig. 3C);

[0041] Fig. 4 is a Voronoi diagram for a Fibonacci distribution for arranging peripheral clear vision zones in a spectacle lens according to a preferred embodiment of the invention; and Fig. 5 shows a representation of the arrow height of a surface of a spectacle lens.

[0042] Fig. 1 shows a horizontal section through the spectacle lens, from the center of the lens to the right.

[0043] A fundamental idea in the development of the present invention was to place the areas of good vision at the center of considerations when designing a spectacle lens for myopia management. The parts of the spectacle lens that do not fall within the areas of good vision are designed as optical elements for myopia-stopping effects.

[0044] Fig. 1 shows a schematic representation of a spectacle lens 10 according to a preferred embodiment of the invention. The spectacle lens has a central main viewing area 12 with a basic optical effect and a functional area adjacent to the main viewing area 12. According to the invention, the functional area comprises a plurality of peripheral clear vision zones 14, which have the basic optical effect, and a network-like, interconnected functional structure 16, which separates the plurality of peripheral clear vision zones 14 both from each other and from the main viewing area 12 and generates a myopia-stopping effect.

[0045] In the exemplary embodiment shown in Fig. 1, the network-like, interconnected effect structure 16 is designed as a substantially hexagonal network structure 16. Within the network structure 16, three bridges 18 meet at each node 20. The bridges 16 can have a constant width between the nodes 20 and, in particular, exhibit a constant additional effect (e.g., a substantially cylindrical additional effect). For this purpose, the spectacle lens can, for example, have a surface or interface on which the bridges 18, as raised structural elements between the clear vision zones 14, locally generate the additional refractive cylindrical effect.

[0046] Fig. 2 shows a schematic 3D view of the arrow height of such a surface or interface of a spectacle lens 10 with a refractive mesh structure according to such a preferred embodiment. The substantially regular hexagons inside the meshes of the hexagonal grid form the separated peripheral clear vision zones 14, which exhibit the basic refractive effect. The raised ridges and nodes together form the exemplary grid structure 16.

[0047] In this case, the functional area for myopia management thus exhibits an additional optical effect compared to the corrective effect of the spectacle lens according to its basic effect. This additional effect is achieved by the mesh structure 16 and can be designed in various ways. For example, in the variant shown in Fig. 2, the mesh structure can consist of segments (the bridges) with a cylindrical effect, or it can contain a combination of cylindrical and spherical additional effects. The myopia-stopping effect is achieved through the additional effect in the mesh structure.

[0048] In this way, the periphery of the spectacle lens can have a structure that functions similarly to spectacle lenses with lenslets. However, by compactly localizing individual areas of good vision within the spectacle lens design, the image quality in the periphery is increased without reducing the proportion of areas with myopia-stopping power, thus improving the comfort and acceptance of the spectacle lenses.

[0049] In the design of the spectacle lens, areas of good vision and their extent are first defined as clear vision zones 14. The functional structure for the myopia stop is formed as a zone between the areas of good vision, thus forming the network structure 16. By concentrating the design on the areas of good vision and arranging the myopia stop in relation to these areas between them, improved image quality is achieved with the same quantitative coverage of the spectacle lens by the functional area in the peripheral zone. This can be demonstrated by the point spread function (PSF), which, in the case of a myopia stop according to the invention, exhibits a calmer structure in a network structure with separated, local clear vision zones.

[0050] For example, Figures 3A-3C compare a spectacle lens without additional power (Figure 3A) with two spectacle lenses for myopia management. The first comparison lens (Figure 3B) places lenslets at the center of the lens design in a hexagonal arrangement and defines the zone with regular corrective power (basic power) as the continuous area between the lenslets. The other lens (Figure 3C) corresponds to a preferred embodiment of the invention. It places the zones of good vision as separate clear-vision zones in a hexagonal arrangement at the center of the view and defines the zone with myopia stop power as the continuous network structure between the zones of good vision. The proportion of the areas with myopia stop power is identical in both comparison lenses shown in Figures 3B and 3C. The lens according to the invention (Figure 3C) shows the smoother structure of the PSF, which offers an advantage in terms of lens compatibility.

[0051] In this concept for a lens used in myopia management, the areas of good vision are placed at the center of the optical design. Therefore, for the peripheral zone, which is intended to provide the myopia-stopping effect, the areas of good vision are defined as local and separate peripheral clear vision zones. This is achieved, for example, by an arrangement of points (also referred to here as clear vision support points) that mark the (e.g., geometric) center and / or the geometric centroid of the respective clear vision zone. This includes not only large areas of good vision, such as the central main viewing area, but also smaller areas (the peripheral clear vision zones), which are preferably arranged in an ordered structure. The clear vision zones can be more generously sized in more important viewing angle areas of the lens, such as...in the central area, or in an additional reading area positioned nasally below the central area. Alternatively or additionally, preferred viewing areas can also be arranged horizontally in the periphery to enhance safety while driving. The clear vision support points can be arranged in various regular layouts, such as triangular, square, or hexagonal patterns, a Fibonacci sequence, or a random arrangement. The arrangement can also prioritize certain areas, for example, to guarantee a large zone of good vision in the center of the lens, and / or to keep a near-vision area free of or with reduced shadowing due to myopia control, thus optimizing lens comfort.

[0052] The Fibonacci sphere distribution has the advantage over a regular grid, such as a hexagonal structure, that no projection of the distribution onto the sphere is necessary, thus eliminating any potential distortion of the arrangement during such a projection. This also guarantees that the arrangement remains uniform across different base curves and that, unlike a regular grid, a different distribution of areas of good vision and myopia stop power does not occur on more highly curved surfaces. Furthermore, the Fibonacci sphere distribution does not exhibit preferred directions, as is the case with regular grids.

[0053] Preferably, a Voronoi diagram is created for the arrangement of the clear vision support points; that is, a grid structure is generated that divides the area into sub-regions, each containing a point and representing the proportion of the area shortest distance to that point among all points. A square arrangement of points results in a square grid, and a triangular or hexagonal arrangement of points results in a triangular or hexagonal grid, respectively. For an arrangement according to the Fibonacci distribution with a free inner zone, the pattern shown in Fig. 4 results, where the inner free zone of good vision is designated as the central main viewing area for the spectacle lens, providing the basic effect of the lens.

[0054] Based on this grid of clear-view support points, the mesh structure is defined as the area for the myopia-stopping effect. This mesh structure is thus composed, in particular, of bars that meet at nodes of the mesh structure and form polygonal lines that surround the individual clear-viewing zones. To define the myopia-stopping effect by the mesh structure, the individual segments of the polygonal line are assigned a width such that the desired proportion of the total area (in particular 5%–90%) is covered by the mesh structure. This width can be constant for the entire polygonal line or vary for each point of the polygonal line, e.g., according to a function depending on the distance of the point from the nearest node of the polygonal line, or according to a function depending on the distance of the point from the center of the lens, or according to a function depending on the position of the lens on the lens surface. In the preferred embodiment of Fig.For example, in 1 and 2 the network structure 16 is hexagonal and the width of the bridge 18 (i.e. the width of the polygonal chain) is constant.

[0055] In terms of its power structure, the spectacle lens contains an additional power compared to its basic power: the myopia stop power. This additional power can be, for example, a refractive power and / or a contrast reduction. It can vary depending on the power structure. For instance, the additional power can be a constant refractive cylindrical power across all segments of the lens. However, the cylinder direction can be adjusted depending on the direction of the respective segment (e.g., the bridge) of the lens. In particular, each segment can have an additional cylindrical or atoric power, with the axis of the additional power being orthogonal to the direction of the segment (e.g., 0.5–10.0 diopters).

[0056] In addition to the cylindrical effect on the segments of the polygon, a spherical or aspherical effect may be present at the vertices of the polygon (nodes of the network structure). The cylindrical structures of the segments preferably connect to the spherical effect of the vertices.

[0057] The myopia-stopping effect can include contrast reduction, either as an alternative or in addition to the refractive effect. The lens structure can also act as a light-scattering element as an additional or alternative function. Either parts of the structure are designed as scatterers without any additional refractive effect, or parts of the structure with a refractive effect also incorporate a scattering function. The degree of light scattering can be chosen as desired.

[0058] The optical structure can also act as an additional or alternative function, absorbing light. This, too, can reduce contrast. Either parts of the structure can be designed as absorbers without any additional refractive effect, or parts of the structure with a refractive effect can also incorporate an absorbing function. The absorption component can be freely selected. The absorber can also be self-tinting, thus reducing the impact of the additional effect in bright environments. The additional functions of diffuser and absorber can be combined as desired.

[0059] This additional effect (myopia stopping effect) can be generated in various ways. For example, the myopia stopping effect can be created as a refractive additional effect (e.g., positive dioptric effect) either via a refractive structure in a lens surface. The refractive structure can be created in a spectacle lens surface, for example, by...

[0060] - about a casting mold for a B ri Heng glass blank

[0061] - by etching onto a surface of the spectacle lens

[0062] - in a coating process for spectacle lens coating

[0063] - using 3D printing

[0064] - in a film on a spectacle lens surface

[0065] The refractive structure can also be incorporated as an intermediate layer in the spectacle lens.

[0066] The additional effect (myopia-stopping effect) can alternatively be implemented as a GRIN structure. The GRIN structure can be incorporated into the lens body or in a thin layer on the lens surface. It can be applied to the lens surface via photopolymerization through selective exposure, 3D printing, or as a film. The additional effect can also be implemented as a diffractive element.

[0067] In the case of a diverging function, the myopia-stopping effect can be achieved through surface roughness or an opacifying material. In the case of an absorbing function, the myopia-stopping effect can be achieved through a colored material, a coating, or an additive in a glass material, e.g., during the casting of lenslets.

[0068] For example, a hexagonal grid structure with a 2 mm spacing between the clear vision support points can be created. The main viewing area, for instance, has a radius of 6 mm, and the grid structure (i.e., the functional area) extends to a radius of 25 mm. The coverage by the grid structure in the peripheral functional area, meaning the proportion of the myopia-stop area, is 50%, and the additional cylindrical power is 3.5 diopters.

[0069] The additional effect is achieved as a refractive structure on the front surface of the lenses and is created by shaping the structure in the mold. This results in the following additional arrow height compared to the basic curve for a refractive index of 1.525, as shown in Fig. 5.

[0070] Reference symbol list

[0071] 10 spectacle lens

[0072] 12 (central) main viewing area

[0073] 14 (peripheral) clear vision zones

[0074] 16 interconnected network-like effect structure (network structure)

[0075] 18 bridges

[0076] 20 junctions

Claims

Patent claims 1. Spectacle lens (10), comprising: a central main viewing area (12) with a basic optical effect and a functional area adjacent to the main viewing area (12), which comprises: a plurality of peripheral clear vision zones (14) which have the basic optical effect, and a network-like interconnected effect structure (16) which separates the plurality of peripheral clear vision zones both from each other and from the main viewing area and produces a myopia stopping effect.

2. Spectacle lens according to claim 1, wherein the myopia stopping effect comprises: a positive dioptric additional effect compared to the basic optical effect; and / or a higher absorption and / or scattering than in the main viewing area and in the peripheral clear vision zones.

3. Spectacle lens according to claim 1 or 2, wherein the central main viewing area comprises a surface containing a circle with a diameter of at least about 8 mm, preferably at least about 10 mm, more preferably at least about 12 mm, further preferably at least about 15 mm, most preferably at least about 20 mm; and / or wherein the central main viewing area lies within a circle with a diameter of no more than about 30 mm, preferably no more than about 20 mm; and / or wherein the functional area lies within a circle with a diameter of no more than about 70 mm, preferably no more than about 60 mm, preferably no more than about 50 mm.

4. Spectacle lens according to one of the preceding claims, wherein the net-like interconnected functional structure comprises a plurality of bridges and nodes such that each bridge separates two adjacent clear vision zones or a clear vision zone and the central main viewing area from each other and at each node at least two, preferably at least three, bridges meet at their respective ends.

5. Spectacle lens according to claim 4, wherein the width of the bridges is in the range of no more than about 5 mm, preferably no more than about 3 mm, even more preferably no more than about 2 mm, further preferably no more than about 1 mm, most preferably no more than about 0.5 mm; and / or wherein the width of the bridges is in the range of at least about 0.05 mm, preferably at least about 0.1 mm, even more preferably at least about 0.2 mm, further preferably at least about 0.3 mm, most preferably at least about 0.5 mm.

6. Spectacle lens according to claim 4 or 5, wherein for each bridge the width between the nodes is essentially constant.

7. Spectacle lens according to one of claims 4 to 6, wherein for each bridge the myopia stopping effect generated along the bridge between the nodes is essentially constant, in particular designed as a cylindrical additional effect.

8. Spectacle lens according to claim 7, wherein the cylindrical additional effect of the bridges is in a range of at least about 0.5 dpt, preferably at least about 1 dpt, more preferably at least about 2 dpt, and / or in a range of not more than about 10 dpt, preferably not more than about 8 dpt, more preferably not more than about 5 dpt.

9. Spectacle lens according to one of the preceding claims, wherein the plurality of peripheral clear vision zones at least about 10, preferably at least about 25, or even more preferably at least about 50 peripheral clear vision zones.

10. Spectacle lens according to one of the preceding claims, wherein the area ratio of each of the peripheral clear vision zones compared to the central main viewing area is in the range of not more than about 1 / 10, preferably not more than about 1 / 25, more preferably not more than about 1 / 50, further preferably not more than about 1 / 100.

11. Spectacle lens according to one of the preceding claims, wherein each of the plurality of peripheral clear vision zones is located within a circular area with a diameter of no more than about 5 mm, preferably no more than about 3 mm, more preferably no more than about 1 mm, and more preferably no more than about 0.5 mm; and / or wherein each of the plurality of peripheral clear vision zones comprises an area containing a circular area with a diameter of at least about 0.02 mm, preferably at least about 0.05 mm, more preferably at least about 0.1 mm, more preferably at least about 0.2 mm, and most preferably at least about 0.5 mm.

12. Spectacle lens according to one of the preceding claims, wherein for each peripheral clear vision zone the ratio between the diameter of the smallest circle that completely contains the respective clear vision zone and the largest circle that lies completely in the respective clear vision zone is not greater than about 3, preferably not greater than about 2.5, more preferably not greater than about 2, further preferably not greater than about 1.5, most preferably not greater than about 1.

3.

13. Spectacle lens according to one of the preceding claims, wherein within the functional area the ratio of the area occupied by the functional structure to the area occupied by the peripheral clear vision zones is in a range of at least about 10%, preferably at least about 20%, more preferably at least about 30%, and / or in a range of not more than about 80%, preferably not more than about 70%, preferably no more than about 60%.

14. Spectacle lens according to one of the preceding claims, wherein the area areas of the peripheral clear vision zones within the functional area are substantially equal.

15. Spectacle lens according to one of the preceding claims, wherein the peripheral clear vision zones are arranged regularly such that the geometric centers of gravity of all peripheral clear vision zones within the functional area lie essentially on a regular arrangement, wherein this regular arrangement is in particular a square arrangement or a (regular) hexagonal arrangement or a Fibonacci sphere distribution.

16. Spectacle lens according to one of the preceding claims, wherein the functional structure (16) comprises a photochromic material.

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