Myopia control lens elements

Abstract

A myopia control lens element suitable for a wearer, the lens element providing a first optical function having a power based on a prescription of the wearer, and comprising a plurality of optical elements, for example at least twenty optical elements, each optical element of the plurality of optical elements providing one or more optical functions, at least one of the one or more optical functions being different from the first optical function; wherein, over at least a 6 mm diameter pupil at 7.5 mm from a center to a reference point of the lens element, for example an optical center, a standard deviation of a power distribution over the pupil is greater than or equal to 4 diopters, for example greater than or equal to 4.5 diopters, for example greater than or equal to 7 diopters.

Description

Technical Field

[0001] This disclosure relates to a lens element suitable for a wearer, such as a myopia control lens element, the lens element providing a first optical function having a power based on the wearer's prescription and including a plurality of optical elements, such as at least twenty optical elements, each of the plurality of optical elements providing one or more optical functions, at least one of the one or more optical functions being different from the first optical function. Background Technology

[0002] Myopia is characterized by the eye focusing distant objects in front of its retina. Myopia is typically corrected with concave lenses, while hyperopia is typically corrected with convex lenses.

[0003] It has been observed that some individuals, particularly children, experience inaccurate focusing when using conventional single-vision lenses to correct their vision, especially when observing objects at near distances (i.e., under near vision conditions). This focusing defect, which is common in myopic children corrected for distance vision, results in images of nearby objects forming behind the retina (even in the fovea region).

[0004] This focusing deficit may affect the progression of myopia in these individuals. It can be observed that, for most of the individuals described, the myopia deficit tends to worsen over time.

[0005] Recent controlled clinical trials have provided evidence that optical elements in the peripheral field of vision, such as microlenses or small lenses, are beneficial in slowing the progression of myopia. The purpose of these optical elements is to provide an optically blurred image on the wearer's retina, thereby triggering a stop signal for eye growth. More generally, the purpose of optical elements is to provide myopia control signals, thereby slowing eye growth.

[0006] The central area of ​​a lens element with optical elements may not contain optical elements in order to achieve good and clear vision.

[0007] Recent research has also shown that myopia progression can be slowed down using an array of small dots by providing slight diffusion in the peripheral visual field. The basic principle of this solution is to reduce the contrast of the eye's elongated signal in the peripheral visual field.

[0008] Within the lens element, which includes optical elements such as microlenses, small lenses, diffuse points, or defocus concentric rings, an alternation of two main areas can be observed: the "refractive area" for correcting the wearer's myopia and the "defocus area" for controlling myopia.

[0009] The new optical design proposes an array of adjacent small lenses covering the lens elements, without a large "refractive area" without optical elements: this means that each optical element can produce both myopia Rx correction (or produce blur that is acceptable for the wearer's good vision) and myopia control defocus signal.

[0010] Optical elements have been designed in various ways to have single-focus spherical microlenses, aspherical microlenses, "bifocal" microlenses, π Fresnel microlenses, or even continuous toroidal surfaces. Optical elements can be contiguous or non-contiguous.

[0011] While the various myopia control designs proposed appear to offer some efficiency, an even more efficient myopia control solution is needed. Summary of the Invention

[0012] Therefore, this disclosure proposes a lens element suitable for a wearer, such as a myopia control lens element, which provides a first optical function having a power based on the wearer's prescription and includes a plurality of optical elements, such as at least twenty optical elements, each of the plurality of optical elements providing one or more optical functions, at least one of the one or more optical functions being different from the first optical function; wherein, at least one pupil with a diameter of 6 mm at a distance of 7.5 mm from the center of the lens element's reference point, such as the optical center, has a standard deviation of power distribution greater than or equal to 4 diopters, such as greater than or equal to 4.5 diopters, such as greater than or equal to 7 diopters.

[0013] Advantageously, having a standard deviation of optical power distribution greater than or equal to 4 diopters allows for good efficiency in the myopia control function of the lens element.

[0014] According to other embodiments that can be considered individually or in combination: - The power distribution is a histogram with a group interval of 0.5 diopters; and / or - At least four 6 mm diameter pupils, or at least eight 6 mm diameter pupils, located 7.5 mm from a reference point, such as the optical center, on each pupil, the standard deviation of the optical power distribution is greater than or equal to 4 diopters, or for example, greater than or equal to 4.5 diopters, or for example, greater than or equal to 7 diopters, and the four pupils, or for example, the eight pupils, are uniformly distributed along a circle with a radius of 7.5 mm centered on the reference point, such as the optical center; and / or - At least twenty pupils, each 6 mm in diameter and 7.5 mm from a reference point (e.g., the optical center) of the lens element, have a standard deviation of optical power distribution greater than or equal to 4 diopters, for example, greater than or equal to 4.5 diopters, or for example, greater than or equal to 7 diopters. These twenty pupils are uniformly distributed along a circle of 10 mm radius centered on the reference point (e.g., the optical center) of the lens element; and / or - On at least one 6 mm diameter pupil, for example, on at least four 6 mm diameter pupils, or for example, on at least eight 6 mm diameter pupils, at a distance of 10 mm from the center and a reference point of the lens element, the standard deviation of the optical power distribution on the pupil is greater than or equal to 4 diopters, for example, greater than or equal to 4.5 diopters, or for example, greater than or equal to 7 diopters, and for example, the four pupils or the at least eight pupils do not overlap with each other; and / or - At least four 6 mm diameter pupils, or at least eight 6 mm diameter pupils, located 10 mm from a reference point (e.g., the optical center) of the lens element, the standard deviation of the power distribution on each pupil is greater than or equal to 4 diopters, or for example, greater than or equal to 4.5 diopters, or for example, greater than or equal to 7 diopters; and the at least four pupils, or at least the at least eight pupils, are uniformly distributed along a circle with a radius of 10 mm centered on the reference point (e.g., the optical center) of the lens element; and / or - At least one 6 mm diameter pupil, for example, at least four 6 mm diameter pupils, or for example, at least eight 6 mm diameter pupils, located 12.5 mm from the center of the lens element reference point, or the optical center, the standard deviation of the optical power distribution on each pupil is greater than or equal to 4 diopters, for example, greater than or equal to 4.5 diopters, or for example, greater than or equal to 7 diopters, and for example, none of the four pupils or the at least eight pupils overlap with each other; and / or - The lens element has a central region including a reference point for the lens element, such as an optical center, which does not contain optical elements and provides a first optical function; and / or - Optical elements are positioned along multiple concentric rings; and / or - Each concentric ring consists of multiple adjacent optical elements; and / or - The concentric ring of the optical element has an inner diameter between 9.0 mm and 60 mm, the inner diameter corresponding to the smallest circle tangent to at least one optical element of the circle; and / or - The lens element has a central region including a reference point for the lens element, such as an optical center, which does not contain optical elements and provides a first optical function; and / or Optical elements are positioned in a network, such as a grid, a cellular structure, or concentric rings; and / or - At least 50%, for example at least 80%, for example at least 99%, of the optical elements are refractive microlenses, such as microlenses with spherical, aspherical, or "bifocal" optical functions; and / or - At least 50%, for example at least 80%, for example at least 99%, of the optical elements are diffuse microlenses or π Fresnel microlenses; and / or - At least 50%, for example, at least 80%, for example, at least 99%, of the optical elements are adjacent optical elements; and / or - At least 50%, for example, at least 80%, for example, at least 99% of the optical elements are non-contiguous optical elements; and / or - Each optical element has an external shape that can be inscribed within a circle with a diameter greater than or equal to 0.1 mm, for example greater than 0.5 mm and less than or equal to 3.0 mm, for example less than or equal to 2.5 mm; and / or - For each circular region having a radius greater than or equal to 1 mm, e.g., greater than or equal to 2 mm and less than or equal to 5 mm, e.g., less than or equal to 4 mm, including a frame reference located at a distance greater than or equal to said radius + 4 mm, e.g., + 5 mm, e.g., + 6 mm from the pupil of the user looking directly forward under standard wearing conditions, the ratio between the sum of the areas of the portions of the optical element within said circular region and the area of ​​said circular region is greater than or equal to 20%, e.g., greater than or equal to 30% and less than or equal to 80%, e.g., less than or equal to 70%, e.g., less than or equal to 60%; and / or - The lens element includes a refractive region configured to provide the wearer with a first optical power based on the wearer's prescription under standard wearing conditions, particularly for foveal visual acuity; and the optical element provides at least a second optical power; and / or - The refractive area comprises multiple separate island-like regions; and / or - The refractive region is formed as a region excluding the optical element, and each refractive island region is located within an optical element; and / or - The refractive region is formed as a region other than the region formed by the plurality of optical elements; and / or - The lens element includes a refractive region configured to provide a first optical power to the wearer under standard wearing conditions, particularly for foveal visual acuity; the optical element provides at least a second optical power, the first and at least the second optical power being based on the wearer's prescription; and / or - The lens element includes a refractive region configured to provide the wearer with a first optical power under standard wearing conditions, particularly for foveal visual acuity; the optics element provides at least a second optical power, the sum of the first and at least the second optical power being based on the wearer's prescription; and / or - The difference in power between the optical element and the wearer's prescription is greater than or equal to 1 diopter, for example, greater than or equal to 2 diopters, for example, greater than or equal to 5 diopters, for example, greater than or equal to 8 diopters; and / or - Optical elements can provide multiple optical functions simultaneously; and / or - At least 50%, for example at least 80%, for example at least 99%, for example all optical elements are diffuse microlenses; and / or - At least 50%, for example at least 80%, for example at least 99%, for example all optical elements are multifocal microlenses; and / or - At least a portion, such as all of the front and / or rear surfaces of the lens element, are covered with a coating; and / or - At least some, for example all, of the optical elements are located on the front surface of the lens element; and / or - At least some, for example all, of the optical elements are located on the rear surface of the lens element; and / or - At least some, for example all, of the optical elements are located between the front and rear surfaces of the lens element; and / or - The optical element has an external shape that can be inscribed within a circle with a diameter greater than or equal to 0.6 mm, for example greater than or equal to 0.8 mm and less than or equal to 3.0 mm, for example less than or equal to 2.0 mm; and / or - Optical components are positioned online; and / or - This network is a structured network; and / or - The lens element further includes at least four optical elements, which are organized into at least two adjacent groups of optical elements; and / or - Each group of adjacent optical elements is organized into at least two concentric rings with the same center, the concentric rings of each group of adjacent optical elements being defined by the inner diameter of the smallest circle tangent to at least one optical element in the group and the outer diameter of the largest circle tangent to at least one optical element in the group; and / or - At least a portion, such as all, of the concentric rings of optical elements are centered on a reference point, such as the optical center, on the surface of the lens element on which the optical element is disposed; and / or - The distance between two successive concentric rings of optical elements is greater than or equal to 0.5 mm, defined by the difference between the outer diameter of the first concentric ring and the inner diameter of the second concentric ring, with the second concentric ring being closer to the periphery of the lens element; and / or - The optical element further includes an optical element radially positioned between two concentric rings; and / or - Structured networks are square, hexagonal, triangular, or octagonal networks; and / or - The network structure is a random network, such as a Voronoid network; and / or - At least 50%, for example at least 80%, for example at least 99%, for example all optical elements have constant optical power and discontinuous first derivatives between two adjacent optical elements; and / or - At least 50%, for example at least 80%, for example at least 99%, for example all optical elements have varying optical power and continuous first derivative between two adjacent optical elements; and / or - At least 50%, for example at least 80%, for example at least 99%, for example all optical elements have the optical function of focusing an image onto a location other than the retina under standard wearing conditions; and / or - At least 50%, for example at least 80%, for example at least 99%, for example all optical elements are in standard wearing conditions and have aspherical focusing optical function for peripheral vision; and / or - At least 50%, for example at least 80%, for example at least 99%, for example all optical elements have cylindrical power; and / or - The optical element is configured such that along at least one segment of the lens element, for example, along at least eight uniformly distributed segments of the lens element, for example, all segments of the lens element, for example, a segment passing through a reference point of the lens element, for example, the optical center, the average spherical power of the optical element increases from a point in said segment toward the peripheral portion of said segment; and / or - The optical element is configured such that along at least one segment of the lens, for example, along at least six uniformly distributed segments of the lens, or for example, along all segments of the lens, the cylindrical lens of the optical element increases from a point in said segment toward the peripheral portion of said segment; and / or - The optical elements are configured such that along at least one segment, for example at least six uniformly distributed segments, each segment passes through the center of six optical elements arranged in a regular manner around a reference point of the lens element; and / or - The optical element is configured such that along at least one segment of the lens, for example along at least eight uniformly distributed segments of the lens, or for example along all segments of the lens, the average spherical and / or cylindrical lens of the optical element increases from the center of the segment toward the peripheral portion of the segment; and / or - The refractive region includes a reference point, such as an optical center, and the optical element is configured such that along at least one segment passing through the reference point, such as the optical center, or along at least six uniformly distributed segments, or all segments, the average spherical and / or cylindrical lens power of the optical element increases from the reference point, such as the optical center, toward the peripheral portion of the lens; and / or - The refractive region includes a distance reference point, a near reference point, and a meridian connecting the distance and near reference points. The optical element is configured such that, under standard wearing conditions, along at least one horizontal segment of the lens, for example, along at least eight uniformly distributed horizontal segments, or for example, all horizontal segments, the average spherical and / or cylindrical lens of the optical element increases from the intersection of the horizontal segment and the meridian toward the peripheral portion of the lens; and / or - The increasing function of the mean spherical and / or cylindrical lens along the segment varies depending on the position of the segment along the meridian; and / or - The increasing function of the mean spherical and / or cylindrical lens along the segment is asymmetric; and / or - The optical element is configured such that, under standard wearing conditions, the at least one segment is a horizontal segment; and / or - The average spherical and / or cylindrical lens of the optical element increases from a first point in the segment toward the periphery of the segment, and decreases from a second point in the segment toward the periphery of the segment, the second point being closer to the periphery of the segment than the first point; and / or - The increasing function of the mean spherical and / or cylindrical lens along at least one segment is a Gaussian function; and / or - The increasing function of the mean spherical and / or cylindrical lens along at least one segment is a quadratic function; and / or - The optical elements are configured such that the average focal distance of the light rays passing through each optical element is the same from the retina; and / or - The refractive region is formed as a region other than the region formed as the plurality of optical elements; and / or - At least some, for example all, of the optical elements are located on the front surface of the lens element; and / or - The at least one multifocal refractive lens includes a cylindrical lens; and / or - The at least one, for example all, multifocal refractive lenses include an aspherical surface, with or without any rotational symmetry; and / or - At least one, for example all, of the optical elements is a toric refractive lens; and / or - At least one multifocal refractive lens includes a tortuous surface; and / or - At least some, such as all, optical functions include higher-order optical aberrations. Attached Figure Description

[0015] Non-limiting embodiments of the present disclosure will now be described with reference to the accompanying drawings, in which: ○ Figure 1 A front view of a lens element according to a first embodiment of this disclosure is shown; ○ Figure 2A and Figure 2B Outline views of lens elements according to two embodiments of this disclosure are shown; ○ Figure 3 A front view of a lens element according to a second embodiment of this disclosure is shown; and ○ Figure 4A and Figure 4B A front view of a lens element according to a third embodiment of this disclosure is shown.

[0016] The elements in the figures are illustrated for simplicity and clarity and are not necessarily drawn to scale. For example, the dimensions of some elements in the figures may be enlarged relative to other elements to aid in understanding the embodiments of this disclosure. Detailed Implementation

[0017] This disclosure relates to a lens element intended to be worn by a wearer.

[0018] In the remainder of this instruction manual, terms such as “upper,” “bottom,” “horizontal,” “vertical,” “above,” “below,” “front,” “back,” or other words indicating relative position may be used. These terms should be understood in the context of wearing the lens element.

[0019] In the context of this disclosure, the term "optical lens" can refer to an uncut optical lens or an eyeglass lens or ophthalmic lens that has been edged to fit a particular eyeglass frame, as well as optical devices suitable for placement on an ophthalmic lens. In the context of this disclosure, "optical lens" may have a coating, such as a hard coating.

[0020] like Figure 1 As shown in Figure 4, the optical lenses L1 and L2 according to this disclosure include a refractive region 12 and multiple optical elements 14.

[0021] The optical element 14 of the optical lens according to this disclosure may have different shapes and / or optical functions or combinations of such shapes and optical functions.

[0022] For example, the optical element can be a spherical microlens, i.e., it has spherical optical functions. An example of a myopia control solution with a spherical microlens is disclosed in US 20170131567.

[0023] For example, the optical element can be an aspherical microlens, that is, having optical functionality including at least two focal points. For example, an aspherical microlens can have a continuous focal length evolution on its surface.

[0024] For example, the optical element may be a "bifocal" microlens comprising a central portion located within an annular portion. The annular portion provides additional optical power, and the central portion provides optical power based on the wearer's prescription. The refractive region comprises multiple separate island-shaped regions. Typically, the refractive region is formed as a region excluding the optical element, and each refractive island-shaped region is located within an optical element. For example, the optical element has an annular shape surrounding the refractive region. An example of this configuration is described in WO2021198362.

[0025] According to embodiments of this disclosure, optical elements can be placed on a structured network (e.g., a square, hexagonal, or random network). Typically, lens elements can include a plurality of adjacent microlenses arranged on such a structured network, the plurality of adjacent microlenses having island-shaped refractive regions within the structured network. This structuring can be achieved by stamping on a single-vision lens. An example of such a configuration is described in WO 2019166657.

[0026] For example, the optical element is a π Fresnel lens. For example, the surface of the lens element is completely covered by multiple adjacent Fresnel-type optical elements. The optical elements are Fresnel-type optical elements whose phase function ψ(r) has a π phase jump at the nominal wavelength λ0. For clarity, these structures can be called "π Fresnel lenses," unlike single-focus Fresnel lenses where the phase jump is a multiple of 2π. Examples of this configuration are disclosed in WO 2019206569 and WO 2021001524.

[0027] For example, the optical elements can be a set of concentric toroidal rings. An example of such a configuration is disclosed in WO 2019166657.

[0028] like Figure 2AThe optical lens, as indicated, includes at least a first surface and a second surface opposite to the second surface. For example, the first surface may include an object-side surface F1 formed as a convex curved surface facing the object side, and the second surface may include an eye-side surface F2 formed as a concave surface with a curvature different from that of the object-side surface. Lens elements L1 and L2 may be made of organic materials, thermosetting or thermoplastic materials (e.g., polycarbonate), or mineral materials (e.g., glass). Lens elements L1 and L2 may also be made of two layers of the aforementioned materials with different refractive indices. Regardless of whether the lens is made of one or more materials, the arrangement of the optical elements can be similar to... Figure 1 , Figure 3 Or the type shown in Figure 4.

[0029] refer to Figure 2B The optical element 10 may include a thermoplastic layer 32 and a thermosetting layer 34. The optical element 14 may be formed within / on the first surface 36 of the thermoplastic layer 32. (As in...) Figure 2B In this process, the first surface 36 of the thermoplastic layer 32 can be processed such that the optical element 14 thereon appears to be recessed within the first surface 36 of the thermoplastic layer 32. As can be understood, the optical element 14 on the first surface 36 of the thermoplastic layer 32 can be hemispherical (spherical or non-spherical) and have a concave shape or protrude toward the object side of the lens element.

[0030] Advantageously, the front and / or rear surfaces of the lens element are smooth.

[0031] In the context of this disclosure, the term "smooth" refers to the state of the surface of a lens element, wherein the surface roughness is less than or equal to 0.5 μm, for example, less than or equal to 0.4 μm. The term "surface roughness" refers to the difference between the maximum and minimum deviation distances from the nearest sphere. The term "nearest sphere" is a spherical shape calculated using least squares measurements (height distribution) of the surface.

[0032] From the perspective of average surface sommel, the term "smooth" can be defined as follows: The term "smooth" refers to the state of a surface whose rate of change of average surface sommel (in D) at a given location on the surface in a given direction is less than or equal to 0.5 D / mm, for example, less than or equal to 0.4 D / mm.

[0033] The term "smoothness" can also be defined as the state in which the difference between the minimum and maximum values ​​of the average surface power is less than the difference between the minimum and maximum values ​​of the transmission power (the power added by the filling segment).

[0034] In embodiments, the thermosetting layer 34 can typically be made of a crosslinked material (e.g., a thermosetting material). Specifically, the thermosetting layer 34 can be a thermosetting layer obtained by polymerization of allyl derivatives (such as allyl carbonates of linear or branched aliphatic or aromatic polyols). This can further include diethylene glycol bis(allyl carbonate), isopropylene bisphenol A bis(allyl carbonate), substrates based on poly(meth)acrylates and copolymers, polythio(meth)acrylates, thermosetting polyurethanes, polythiourethanes, polyepoxides, polycyclic sulfides, and copolymers thereof and blends thereof. In embodiments, the thermosetting layer 34 can be an Orma® substrate, such as a substrate obtained by (co)polymerization of a dielyl carbonate of diethylene glycol sold by PPG Industries as CR-39®. The thicknesses of layers 32 and 34 can be similar (between 500 µm and 1 mm) or very different (e.g., one of the two layers has a thickness of less than 400 µm, while the other has a thickness of more than 1 mm).

[0035] like Figure 1 As shown in Figure 4, lens elements L1 and L2 include refractive regions 12.

[0036] Refractive region 12 has a refractive power Px based on a prescription for the wearer's eye (e.g., a prescription for the person to whom the optical lens is intended). The prescription, for example, is intended to correct an abnormal refractive error in the wearer's eye of the optical lens.

[0037] The term "prescription" should be understood as a set of optical characteristics, including power, astigmatism, and prism deviation, determined by an ophthalmologist or optometrist to correct visual defects, for example, by means of a lens positioned in front of the wearer's eye. For example, a prescription for myopia includes a power value and an astigmatism value with an axis for distance vision.

[0038] Prescriptions may include instructions that the wearer's eyes are free of defects and that no refractive power will be provided to the wearer. In this case, the refractive zone is configured not to provide any refractive power.

[0039] The refractive region is preferably formed as a region other than the region formed by the plurality of optical elements. In other words, the refractive region is a region complementary to the region formed by the plurality of optical elements.

[0040] According to embodiments of this disclosure, the refractive region may include multiple separate island-shaped regions. For example, each refractive island-shaped region is located within an optical element.

[0041] This arrangement of the refractive area is disclosed in WO 2021198362.

[0042] like Figure 1 , Figure 3 As shown in Figure 4, the refractive region 12 may include at least the central region of the optical lens 10.

[0043] The central region may have a characteristic dimension greater than 4 mm, for example greater than or equal to 8 mm and less than 22 mm, for example less than 20 mm, for example less than or equal to 12 mm. For example, the central region is a circular area centered on the reference point of the lens element, for example the optical center, and has a diameter greater than 4 mm, for example greater than or equal to 8 mm and less than 22 mm, for example less than 20 mm, for example less than or equal to 12 mm.

[0044] The central region can be centered on the reference point of the optical lens 10. The reference point (the central region can be centered on this reference point) is one of the geometric center and / or optical center of the optical lens and / or near vision reference point and / or distance vision reference point.

[0045] Preferably, the central area is centered on or includes at least a frame reference point, which faces the wearer's pupil when looking straight ahead under standard wearing conditions.

[0046] Wearing conditions should be understood as the position of the optical lens relative to the wearer's eyes, defined by factors such as the anterior tilt angle, the distance from the cornea to the lens, the distance from the pupil to the cornea, the distance from the center of rotation of the eye (CRE) to the pupil, the distance from the CRE to the lens, and the wrap angle.

[0047] The corneal-to-lens distance is the distance between the cornea and the posterior surface of the lens along the visual axis of the eye in the first eye position (which is usually considered to be horizontal); for example, it is equal to 12 mm.

[0048] The pupil-to-corneal distance is the distance between the pupil and the cornea along the visual axis of the eye; it is usually equal to 2 mm.

[0049] The distance from the CRE to the pupil is the distance along the visual axis of the eye between the cornea at its center of rotation (CRE); for example, it is equal to 11.5 mm.

[0050] The distance from the CRE to the lens is the distance along the visual axis of the eye in the first eye position (which is usually considered to be horizontal) between the CRE of that eye and the posterior surface of the lens, for example, equal to 25.5 mm.

[0051] The tilt angle is the angle in a vertical plane between the intersection of the posterior surface of the lens and the visual axis of the eye in the first eye position (which is usually considered to be horizontal), between the normal of the posterior surface of the lens and the visual axis of the eye in the first eye position; for example, it is equal to -8°, preferably equal to 0°.

[0052] The wrap angle is the angle in the horizontal plane between the normal to the posterior surface of the lens and the visual axis of the eye in the first eye position (which is usually considered to be horizontal), for example, equal to 0°.

[0053] Examples of standard wearing conditions can be defined by an anterior tilt angle of -8°, a corneal-to-lens distance of 12 mm, a pupil-to-corneal distance of 2 mm, a CRE-to-pupil distance of 11.5 mm, a CRE-to-lens distance of 25.5 mm, and a wrap angle of 0°.

[0054] Another example of standard wearing conditions that are more suitable for younger wearers can be defined by a 0° anterior tilt angle, a 12 mm corneal-to-lens distance, a 2 mm pupil-to-corneal distance, an 11.5 mm CRE-to-pupil distance, a 25.5 mm CRE-to-lens distance, and a 0° wrap angle.

[0055] The central region may include the optical center of an optical lens and have a characteristic dimension greater than 4 mm (corresponding to a peripheral angle of + / - 8° on the retinal side) and less than 22 mm (corresponding to a peripheral angle of + / - 44° on the retinal side), for example less than 20 mm (corresponding to a peripheral angle of + / - 40° on the retinal side). The characteristic dimension may be a diameter or the major or minor axis of the elliptical central region.

[0056] The refractive zone 12 may include a continuous variation in refractive power. For example, the refractive zone may have a progressive multifocal design. The optical design of the refractive zone may include: a fitting cross, at which the optical power is negative; and a first zone that extends temporally within the refractive zone when the wearer wears the lens element. In the first zone, the optical power increases as it moves towards the temporal side, and on the nasal side of the lens, the optical power of the ophthalmic lens is substantially the same as that at the fitting cross. This optical design is disclosed in more detail in WO 2016 / 107919.

[0057] Alternatively, the refractive power in the refractive region 12 may include at least one discontinuity.

[0058] like Figures 1 to 3 As shown, lens elements L1 and L2 include a plurality of optical elements 14 and a region of interest 20 including the plurality of said optical elements 14.

[0059] At least 50%, for example, at least 80%, or for example, all of the surfaces of lens elements L1 and L2 may be covered by at least one coating element layer. The at least one coating element layer may include features selected from the group consisting of scratch resistance, anti-reflection, dirt resistance, dust resistance, UV30 filtration, blue light filtration, and abrasion resistance.

[0060] Any known technique can be used to provide a layer of coating for an element. For example, a dip coating process can be used to provide a layer of coating, in which the optical lens simultaneously receives a layer of coating on each surface.

[0061] The optical element has a transparent optical function that prevents the image from being focused on the retina of the wearer's eye when the optical lens is worn under standard wearing conditions.

[0062] In other words, when a wearer wears the lens elements, for example under standard wearing conditions, the light passing through these multiple optical elements will not focus on the wearer's retina. For example, the optical elements may focus in front of and / or behind the wearer's retina.

[0063] Advantageously, not focusing the image onto the wearer's retina allows for the generation of control signals that suppress, reduce, or at least slow the progression of refractive abnormalities (such as myopia or hyperopia) in the eye of a person wearing a lens element.

[0064] In the sense of this disclosure, an optical element is considered to have transparent optical function when it absorbs less than 50%, for example less than 20%, or for example less than 5% of light in the visible spectrum (i.e., 380 nm to 750 nm).

[0065] The optical element may be, for example, a small lens that provides additional optical power relative to the focal power of the prescription based on the human eye.

[0066] An example of such a configuration of optical elements is disclosed in WO 2019166659, the contents of which are included in this application by reference.

[0067] like Figure 1 As shown, according to embodiments of this disclosure, optical elements are positioned along multiple concentric rings. Each ring may consist of adjacent optical elements. Advantageously, this configuration provides an excellent trade-off between the myopia control function of the optical elements and the visual acuity provided by the lens elements.

[0068] In other words, optical elements can be organized into multiple groups of adjacent optical elements. Each group of adjacent optical elements can be organized into concentric rings with the same center, for example, at least 5 concentric rings, such as 11 concentric rings. The concentric rings of each group of adjacent optical elements are defined by an inner diameter corresponding to the smallest circle tangent to at least one optical element in the group and an outer diameter corresponding to the largest circle tangent to at least one optical element in the group.

[0069] Typically, the concentric rings of optical elements have a diameter between 9.0 mm and 60 mm.

[0070] According to an embodiment of this disclosure, the distance between two successive concentric rings of optical elements is greater than or equal to 0.5 mm, for example, greater than 1 mm. The distance between the two successive concentric rings is defined by the difference between the outer diameter of the first concentric ring and the inner diameter of the second concentric ring, with the second concentric ring being closer to the periphery of the lens element.

[0071] like Figure 3 As shown, according to embodiments of this disclosure, optical elements are based on structured networks (in... Figure 3 In the illustration, this mesh is positioned as a hexagonal mesh, which allows for a good trade-off between the myopia control function of the optical element and the visual acuity provided by the lens element. Alternatively, the mesh could also be a square mesh.

[0072] like Figure 3 As shown, at least 50%, for example at least 80%, for example at least 99%, of the optical elements are non-contiguous optical elements. In the sense of this invention, two optical elements are considered non-contiguous if there is no path between their reference points (e.g., centers) that does not traverse the region with refractive power.

[0073] like Figure 4A and Figure 4B As shown, according to an embodiment of this disclosure, the optical element has an annular shape defined by an inner diameter and an outer diameter.

[0074] In this embodiment, the optical element corresponds to a portion of a purely cylindrical concentric ring. In this example, the optical element has a constant focal length but a variable cylindrical axis.

[0075] For example, an optical element corresponds to a series of concentric toroidal rings.

[0076] Each optical element also has a geometric center. All optical elements are positioned such that their geometric centers are located in the same place, for example, at the optical center of the lens element. The width of the annular shape and the distance separating two adjacent annular shapes affect the trade-off between the myopia control function of the optical element and the visual acuity provided by the lens element.

[0077] As shown in Figure 2, the lens element 10 according to this disclosure includes, for example, an object-side surface F1 formed as a convex curved surface facing the object side, and an eye-side surface F2 formed as a concave surface having a curvature different from that of the object-side surface F1.

[0078] At least some, such as all, of the optical elements may be located on the front surface of the lens element.

[0079] At least some, for example all, of the optical elements may be located on the rear surface of the lens element.

[0080] At least some, such as all, of the optical elements may be located between the front and rear surfaces of the lens element. For example, the lens element may include regions with different refractive indices forming the optical elements, such as... Figure 2B As shown, an example of this configuration is provided in WO2023104982 A1.

[0081] At least one of the optical elements may have the optical function of focusing an image onto a location other than the retina.

[0082] Preferably, at least 50%, for example at least 80%, for example at least 99%, for example all optical elements may have the optical function of focusing the image on a location other than the retina.

[0083] All optical elements can be configured such that the average focal point of light passing through each optical element is at the same distance from the wearer's retina.

[0084] The optical function, particularly the refractive function, of each optical element can be optimized to provide a focused image at a constant distance from the wearer's retina, such as in peripheral vision. This optimization requires adjusting the refractive function of each optical element according to its position on the lens element.

[0085] The optical element can be configured such that, along at least one segment of the lens, for example, along at least eight uniformly distributed segments, the average additional optical power of the optical element monotonically varies from a point on the segment at a distance of less than 9 mm from a reference point of the lens towards the periphery of the segment to a point at least 50 mm from a reference point of the lens element.

[0086] At least a portion of the optical elements, such as at least 50%, at least 80%, at least 99%, or all of the optical elements, are multifocal microlenses. Advantageously, such multifocal microlenses may have a first optical power corresponding to the prescription and a second optical power different from the first optical power, so as to focus light on a location other than the wearer's retina.

[0087] According to the alternative to this disclosure, at least 50%, for example at least 80%, for example at least 99%, for example all optical elements are π Fresnel lenses, for example adjacent π Fresnel lenses.

[0088] In the context of this disclosure, two optical elements are considered to be adjacent if there exists a path connecting them along which at least one optical power, which differs from the optical power of a prescription based on the wearer, for example, for correcting refractive errors in the wearer's eye, can be measured under standard wearing conditions.

[0089] According to embodiments of this disclosure, at least 50%, for example at least 80%, for example at least 99%, for example all optical elements have discontinuities, such as discontinuous surfaces (e.g., Fresnel surfaces) and / or discontinuous refractive index distributions.

[0090] An example of a π Fresnel microlens is disclosed in WO 2019206569.

[0091] According to embodiments of this disclosure, at least 50%, for example at least 80%, for example at least 99%, for example all optical elements are diffuse microlenses or scattering elements, as disclosed in WO 2022074243.

[0092] The lens element according to the invention is particularly suitable for myopia control because of the fact that the standard deviation of the power distribution on at least one 6 mm diameter pupil, which is 7.5 mm away from the reference point of the lens element, for example the optical center, is greater than or equal to 4 diopters, for example greater than or equal to 4.5 diopters, for example greater than or equal to 7 diopters.

[0093] The inventors have observed that a larger standard deviation in the power distribution enhances the myopia control effect of the lens element according to this disclosure.

[0094] The optical power distribution can be determined using a deflection measurement method, for example, by providing an image composed of pixels less than or equal to 0.05 mm × 0.05 mm.

[0095] In the sense of this disclosure, the feature “the image used” corresponds to the result of a transformation of an image acquired by an image acquisition device using an algorithm.

[0096] Optical power distribution can be achieved using commercially available lens mappers (such as the NIMO proposed by Lambda-X). TM The solution is determined by a two-dimensional representation of the local optical power obtained.

[0097] This solution has been commercially proposed for mapping contact lenses, and adjustments may be required for larger lenses (such as spectacle lenses).

[0098] In this configuration, the lens element is located in the horizontal plane of the measuring device and can be shifted in different x and y directions, as shown in Figure 4. In the Nimo solution, the optical center of the lens element is not systematically aligned with the collimated measuring beam. Furthermore, in the current version of the Nimo solution, there is no clamp that allows the lens element to be centered; therefore, the inventors propose using the original view of the stripe pattern, which is visible in real-time due to the camera's video mode, and ensuring its centering.

[0099] Therefore, it is clear that the deflection measurement method allows for an accurate two-dimensional representation of the local focal power of at least a portion of the lens element.

[0100] Advantageously, deflection measurement methods, such as fringe deflection measurement methods, are easier, cheaper, and shorter to implement than surface measurements.

[0101] According to embodiments of this disclosure, the optical power distribution can be represented as a histogram with group intervals greater than or equal to 0.1 diopters, for example, greater than or equal to 0.25 diopters and less than or equal to 0.8 diopters, for example, less than or equal to 0.6 diopters. For example, the group interval is equal to 0.5 diopters.

[0102] According to embodiments of this disclosure, at least four or at least eight 6-mm diameter pupils can be identified at a distance of 7.5 mm from a reference point, such as an optical center, of the lens element. The standard deviation of the optical power distribution on each of these pupils is greater than or equal to 4 diopters, such as 4.5 diopters, or 7 diopters. The four or eight pupils are uniformly distributed along a circle with a radius of 7.5 mm centered on the reference point, such as the optical center, of the lens element.

[0103] Advantageously, the efficiency of myopia control solutions is improved by making the following pupils uniformly distributed: the standard deviation of the optical power distribution on each pupil is greater than or equal to 4 diopters, for example greater than or equal to 4.5 diopters, for example greater than or equal to 7 diopters.

[0104] According to embodiments of this disclosure, at least twenty pupils with a diameter of 6 mm can be identified, each 7.5 mm away from a reference point, such as the optical center, of the lens element. The standard deviation of the power distribution on each pupil is greater than or equal to 4 diopters, for example, greater than or equal to 4.5 diopters, or for example, greater than or equal to 7 diopters. The twenty pupils are uniformly distributed along a circle with a radius of 10 mm centered on the reference point, such as the optical center, of the lens element.

[0105] Advantageously, the uniform distribution of at least twenty pupils improves the efficiency of myopia control solutions, particularly in different gaze directions: the standard deviation of the optical power distribution on each pupil is greater than or equal to 4 diopters, for example greater than or equal to 4.5 diopters, for example greater than or equal to 7 diopters.

[0106] According to embodiments of this disclosure, at least one 6 mm diameter pupil, for example, at least four 6 mm diameter pupils, or at least eight 6 mm diameter pupils, can be identified at a reference point between the center and the lens element, such as at least one 6 mm diameter pupil 10 mm away from the optical center, where the standard deviation of the optical power distribution on the pupils is greater than or equal to 4 diopters, for example greater than or equal to 4.5 diopters, or for example greater than or equal to 7 diopters, and where the four pupils or the at least eight pupils do not overlap with each other.

[0107] Advantageously, having pupils at a distance of 10 mm from the reference point improves the efficiency of myopia control solutions, especially in different gaze directions: the standard deviation of the optical power distribution on each pupil is greater than or equal to 4 diopters, for example greater than or equal to 4.5 diopters, for example greater than or equal to 7 diopters.

[0108] According to embodiments of this disclosure, at least four pupils with a diameter of 6 mm, or at least eight pupils with a diameter of 6 mm, can be identified at a distance of 10 mm from a reference point of the lens element, such as an optical center. On these pupils, the standard deviation of the optical power distribution on each pupil is greater than or equal to 4 diopters, such as greater than or equal to 4.5 diopters, or for example greater than or equal to 7 diopters. The at least four pupils, or the at least eight pupils, are uniformly distributed along a circle with a radius of 10 mm centered on the reference point of the lens element, such as the optical center.

[0109] Advantageously, uniform distribution of the following pupils improves the efficiency of myopia control solutions, particularly in different gaze directions: the standard deviation of the optical power distribution on each pupil is greater than or equal to 4 diopters, for example greater than or equal to 4.5 diopters, for example greater than or equal to 7 diopters.

[0110] According to embodiments of this disclosure, at least one 6 mm diameter pupil, for example, at least four 6 mm diameter pupils, or at least eight 6 mm diameter pupils, can be identified at a reference point between the center and the lens element, such as at least one 6 mm diameter pupil 12.5 mm away from the optical center, where the standard deviation of the optical power distribution on each pupil is greater than or equal to 4 diopters, for example greater than or equal to 4.5 diopters, or for example greater than or equal to 7 diopters, and where the four pupils or the at least eight pupils do not overlap with each other.

[0111] Advantageously, having pupils at a distance of 12.5 mm from the reference point improves the efficiency of the myopia control solution, especially in different gaze directions: the standard deviation of the optical power distribution on each pupil is greater than or equal to 4 diopters, for example greater than or equal to 4.5 diopters, for example greater than or equal to 7 diopters.

[0112] The present disclosure has been described above with the aid of embodiments, but is not intended to limit the general inventive concept. Many further modifications and variations will be apparent to those skilled in the art upon reference to the foregoing illustrative embodiments. These embodiments are given by way of example only and are not intended to limit the scope of the disclosure, which is defined solely by the appended claims.

[0113] In the claims, the word "comprising" does not exclude other elements or steps, and the indefinite articles "a" or "an" do not exclude a plural. The mere fact that different features are described in mutually different dependent claims does not imply that combinations of these features cannot be used advantageously. Any reference numerals in the claims should not be construed as limiting the scope of this disclosure.

Claims

1. A lens element suitable for a wearer, such as a myopia control lens element, the lens element providing a first optical function having a power based on the wearer's prescription, and comprising a plurality of optical elements, such as at least twenty optical elements, each of the plurality of optical elements providing one or more optical functions, at least one of the one or more optical functions being different from the first optical function; in, At least one pupil with a diameter of 6 mm, located 7.5 mm away from the reference point of the lens element, such as the optical center, the standard deviation of the power distribution on the pupil is greater than or equal to 4 diopters, for example, greater than or equal to 4.5 diopters, or for example, greater than or equal to 7 diopters.

2. The lens element according to claim 1, wherein, At least four, or at least eight, 6-mm diameter pupils located 7.5 mm from the center of the lens element's reference point, or optical center, the standard deviation of the optical power distribution on each pupil is greater than or equal to 4 diopters, or for example, greater than or equal to 4.5 diopters, or for example, greater than or equal to 7 diopters. The four pupils, or the eight pupils, are uniformly distributed along a circle with a radius of 7.5 mm centered on the lens element's reference point, or optical center.

3. The lens element according to any one of the preceding claims, wherein, At least twenty pupils with a diameter of 6 mm, located 7.5 mm from the center of the lens element at the reference point, such as the optical center, have a standard deviation of optical power distribution greater than or equal to 4 diopters, for example greater than or equal to 4.5 diopters, for example greater than or equal to 7 diopters, and the twenty pupils are uniformly distributed along a circle with a radius of 10 mm centered on the reference point, such as the optical center of the lens element.

4. The lens element according to any one of the preceding claims, wherein, At least one 6 mm diameter pupil, for example, at least four 6 mm diameter pupils, or for example at least eight 6 mm diameter pupils, located 10 mm away from the reference point of the lens element, such as the optical center, have a standard deviation of optical power distribution greater than or equal to 4 diopters, for example greater than or equal to 4.5 diopters, or for example greater than or equal to 7 diopters, and for example, none of the four pupils or the at least eight pupils overlap with each other.

5. The lens element according to any one of the preceding claims, wherein, At least four, or at least eight, 6-mm diameter pupils located 10 mm from the center of the lens element's reference point, or optical center, the standard deviation of the power distribution on each pupil is greater than or equal to 4 diopters, or for example, greater than or equal to 4.5 diopters, or for example, greater than or equal to 7 diopters. The at least four pupils, or the at least eight pupils, are uniformly distributed along a circle with a radius of 10 mm centered on the lens element's reference point, or optical center.

6. The lens element according to any one of the preceding claims, wherein, At least one 6 mm diameter pupil, for example, at least four 6 mm diameter pupils, or for example at least eight 6 mm diameter pupils, located 12.5 mm away from the reference point of the lens element, or the optical center, the standard deviation of the optical power distribution on each pupil is greater than or equal to 4 diopters, for example greater than or equal to 4.5 diopters, or for example greater than or equal to 7 diopters, and for example, the four pupils or the at least eight pupils do not overlap with each other.

7. The lens element according to the preceding claim, wherein, The lens element has a central region including the reference point of the lens element, such as the optical center, the central region containing no optical elements and providing the first optical function.

8. The lens element according to any one of the preceding claims, wherein, The optical elements are positioned along multiple concentric rings.

9. The lens element according to the preceding claim, wherein, Each concentric ring consists of multiple adjacent optical elements.

10. The lens element according to any one of claims 8 or 9, wherein, The concentric ring of the optical element has an inner diameter between 9.0 mm and 60 mm, the inner diameter corresponding to the smallest circle tangent to at least one optical element of the circle.

11. The lens element according to any one of the preceding claims, wherein, At least 50%, for example at least 80%, for example at least 99%, of the optical elements are microlenses, such as microlenses with spherical, aspherical, or "bifocal" optical functions.

12. The lens element according to any one of the preceding claims, wherein, At least 50%, for example at least 80%, for example at least 99% of the optical elements are π Fresnel lenses.

13. The lens element according to claim 12, wherein, At least 50%, for example at least 80%, for example at least 99%, of the optical elements are adjacent optical elements.

14. The lens element according to any one of the preceding claims, wherein, Each of the optical elements has an external shape that can be inscribed within a circle with a diameter greater than or equal to 0.1 mm, for example greater than 0.5 mm and less than or equal to 3.0 mm, for example less than or equal to 2.5 mm.

15. The lens element according to any one of the preceding claims, wherein, For each circular region having a radius greater than or equal to 1 mm, for example greater than or equal to 2 mm and less than or equal to 5 mm, for example less than or equal to 4 mm, including a frame reference located at a distance greater than or equal to the radius + 4 mm, for example + 5 mm, for example + 6 mm from the pupil facing the user looking directly forward under standard wearing conditions, the ratio between the sum of the areas of the portions of the optical element located within the circular region and the area of ​​the circular region is greater than or equal to 20%, for example greater than or equal to 30% and less than or equal to 80%, for example less than or equal to 70%, for example less than or equal to 60%.

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