WO2025037040A2

WO2025037040A2 - Myopia control lens element

Info

Publication number: WO2025037040A2
Application number: PCT/EP2024/085161
Authority: WO
Inventors: Rajkumar NALLOUR RAVEENDRAN; Matthieu Guillot; Bruno Fermigier; Eric Gacoin; Bjorn Drobe
Original assignee: Essilor International Compagnie Generale dOptique SA
Current assignee: EssilorLuxottica SA
Priority date: 2023-12-08
Filing date: 2024-12-06
Publication date: 2025-02-20
Anticipated expiration: 2026-06-08
Also published as: WO2025037040A3

Abstract

Myopia control lens element Lens element, for example a myopia control lens element, adapted for a wearer, said lens element providing a first optical function having a power based on the 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 which is different from the first optical function; wherein over at least a 6 mm diameter pupil whose center is at 7.5 mm from a reference point, for example the optical center, of the lens element the standard deviation of the optical power distribution over said 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

Myopia control lens element

TECHNICAL FIELD

The disclosure relates to a lens element, for example a myopia control lens element, adapted for a wearer, said lens element providing a first optical function having a power based on the 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 which is different from the first optical function.

BACKGROUND OF THE DISCLOSURE

Myopia of an eye is characterized by the fact that the eye focuses distant objects in front of its retina. Myopia is usually corrected using a concave lens and hyperopia is usually corrected using a convex lens.

It has been observed that some individuals when corrected using conventional single vision optical lenses, in particular children, focus inaccurately when they observe an object which is situated at a short distance away, that is to say, in near vision conditions. Because of this focusing defect on the part of a myopic child which is corrected for his far vision, the image of an object close by is also formed behind his retina, even in the foveal area.

Such focusing defect may have an impact on the progression of myopia of such individuals. One may observe that for most of said individuals the myopia defect tends to increase over time.

Recent controlled clinical trials provided evidence of the benefit of optical elements, such as microlenses or lenslets, in the peripheral visual field to slow down myopia progression. The purpose of the optical elements is to provide an optical blurred image on the retina of the wearer, triggering a stop signal to the eyes growth. More generally, the purpose of the optical elements is to provide a myopia control signal, slowing down the eye growth.

The central area of the lens element having the optical elements may be free of optical elements, to enable a good and clear vision. Recent studies also showed that myopia progression could be slowed down by providing a slight diffusion in the periphery visual field, with arrays of small dots. The basic principle of this solution is to decrease the contrast of the eye elongation signal, in the peripheral visual field.

In the areas of the lens element comprising optical elements (like microlenses, or lenslets or dots of diffusion, or concentric rings of defocus) we can find alternance of two main areas: the “refractive areas” used to correct the myopia of the wearer, and the “defocus areas” used to control the myopia.

New optical designs propose arrays of contiguous lenslets covering the lens element, without large “refractive areas” free of optical elements: that means that each optical element creates both functions of myopia Rx correction (or create a blur acceptable for the good vision of the wearer) and myopia control defocus signal.

Different designs of optical elements have been designed with unifocal spherical lenslets, aspherical lenslets, “bifocal” lenslets, Pi-Fresnel lenslets, or even continuous torus, the optical elements may be contiguous or not.

Although the different proposed myopia control designs appear to provide some efficiency, there is a need to provide even more efficient myopia control solution.

SUMMARY OF THE DISCLOSURE

To this end, the present disclosure proposes, a lens element, for example a myopia control lens element, adapted for a wearer, said lens element providing a first optical function having a power based on the 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 which is different from the first optical function; wherein over a at least a 6 mm diameter pupil whose center is at 7.5 mm from a reference point, for example the optical center, of the lens element the standard deviation of the optical power distribution 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.

Advantageously, having standard deviation of the optical power distribution is greater than or equal to 4 diopters allows to assure a good efficiency in myopia control function of the lens element. According to further embodiments which can be considered alone or in combination:

- the optical power distribution is a histogram with a bin of 0.5 diopters; and/or

- over at least four pupils of 6 mm diameters, for example at least over eight pupils of 6 mm diameters, whose centers are at 7.5 mm from the reference point, for example the optical center, of the lens element the standard deviation of the optical power distribution over 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, said four pupils, for example said for eight pupils, being evenly spread along a circle of 7.5 mm radius centered on the reference point, for example the optical center, of the lens element; and/or

- over at least twenty pupils of 6 mm diameters whose centers are at 7.5 mm from the reference point, for example the optical center, of the lens element the standard deviation of the optical power distribution over 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, said twenty pupils being evenly spread along a circle of 10 mm radius centered on the reference point, for example the optical center, of the lens element; and/or

- over at least one pupil of 6 mm diameter, for example at least four pupils of 6 mm diameters, for example at least over eight pupils of 6 mm diameters, whose center is at 10 mm from the reference point, for example the optical center, of the lens element the standard deviation of the optical 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 for example none of the said four pupils, for example the said at least eight pupils, overlap with each other; and/or

- over at least four pupils of 6 mm diameters, for example at least over eight pupils of 6 mm diameters, whose centers are at 10 mm from the reference point, for example the optical center, of the lens element the standard deviation of the optical power distribution over 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 said at least four pupils, for example said at least eight pupils, being evenly spread along a circle of 10 mm radius centered on the reference point, for example the optical center, of the lens element; and/or

- over at least one pupil of 6 mm diameter, for example at least four pupils of 6 mm diameters, for example at least over eight pupils of 6 mm diameters, whose center is at 12.5 mm from the reference point, for example the optical center, of the lens element the standard deviation of the optical power distribution over 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, for example none of the said four pupils, for example the said at least eight pupils, overlap with each other; and/or

- the lens element has a center area comprising the reference point, for example the optical center, of the lens element free of optical elements and providing the first optical function; and/or

- the optical elements are positioned along a plurality of concentric rings; and/or

- each concentric ring consists of a plurality of contiguous optical elements; and/or

- the concentric rings of optical elements have an inner diameter comprised between 9.0 mm and 60 mm, the inner diameter corresponding to the smallest circle that is tangent to at least one optical element of said circle; and/or

- the optical elements are positioned in a network, such as for instance a grid, a honeycomb, or concentric rings; and/or

- at least 50%, for example at least 80%, for example at least 99%, of the optical elements are refractive lenslets, for example having a spherical, aspherical optical function or “bifocal” lenslets; and/or

- at least 50%, for example at least 80%, for example at least 99%, of the optical elements are diffusive lenslets or Pi-Fresnel lenslets; and/or

- at least 50%, for example at least 80%, for example at least 99%, of the optical elements are contiguous 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 a contour shape being inscribable in a circle having a diameter greater than or equal to 0.1 mm, for example greater than 0.5 mm and smaller than or equal to 3.0 mm, for example smaller than or equal to 2.5 mm; and/or

- for every circular zone having a radius greater than or equal to 1 mm, for example greater than or equal to 2 mm, and smaller than or equal to 5 mm, for example smaller than or equal to 4 mm, comprising a geometrical center located at a distance of the framing reference that faces the pupil of the user gazing straight ahead in standard wearing conditions greater or equal to said radius + 4mm, for example +5 mm, for example +6 mm, the ratio between the sum of areas of the parts of optical elements located inside said circular zone and the area of said circular zone is greater than or equal to 20%, for example greater than or equal to 30% and smaller than or equal to 80%, for example smaller than or equal to 70%, for example smaller than or equal to 60%; and/or

- the lens element comprises a refraction area configured to provide to the wearer in standard wearing conditions, in particular for foveal vision, a first optical power based on the prescription of the wearer, the optical elements providing at least a second optical power; and/or

- the refraction area comprises a plurality of respectively independent islandshaped areas; and/or

- the refraction area is formed as the area other than the optical elements and each refraction island shape area is within one optical element; and/or

- the refraction area is formed as the area other than the areas formed of the plurality of optical elements; and/or

- the lens element comprises a refraction area configured to provide to the wearer in standard wearing conditions, in particular for foveal vision, a first optical power, the optical elements providing at least a second optical power, the first optical power and the at least second optical power being based on the prescription of the wearer; and/or

- the lens element comprises a refraction area configured to provide to the wearer in standard wearing conditions, in particular for foveal vision, a first optical power, the optical elements providing at least a second optical power, the sum of the first optical power and the at least second optical power being based on the prescription of the wearer; and/or

- the optical elements have a difference of power with the prescription of the wearer greater than or equal tol 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

- the optical elements may provide simultaneously a plurality of optical functions; and/or at least 50%, for example at least 80%, for example at least 99%, for example all, of the optical elements are diffusive lenslets; and/or at least 50%, for example at least 80%, for example at least 99%, for example all, of the optical elements are multifocal lenslets; and/or at least part, for example all, of the front and/or the back surface of the lens element is covered with a coating; and/or at least part, for example all, of the optical elements are located on the front surface of the lens element; and/or at least part, for example all, of the optical elements are located on the back surface of the lens element; and/or at least part, for example all, of the optical elements are located between the front and the back surfaces of the lens element; and/or

- the optical elements have a contour shape being inscribable in a circle having a diameter greater than or equal to 0.6 mm, for example greater than or equal to 0.8 mm and smaller than or equal to 3.0 mm, for example smaller than or equal to 2.0 mm; and/or

- the optical elements are positioned on a mesh; and/or

- the mesh is a structured mesh; and/or

- the lens element further comprises at least four optical elements organized in at least two groups of contiguous optical elements; and/or each group of contiguous optical element is organized in at least two concentric rings having the same center, the concentric ring of each group of contiguous optical element being defined by an inner diameter corresponding to the smallest circle that is tangent to at least one optical element of said group and an outer diameter corresponding to the largest circle that is tangent to at least one optical elements of said group; and/or at least part of, for example all the concentric rings of optical elements are centered on the reference point, for example the optical center, of the surface of the lens element on which said optical elements are disposed; and/or

- the distance between two successive concentric rings of optical elements is greater than or equal to 0.5 mm, the distance between two successive concentric rings being defined by the difference between the outer diameter of a first concentric ring and the inner diameter of a second concentric ring, the second concentric ring being closer to the periphery of the lens element; and/or - the optical element further comprises optical elements positioned radially between two concentric rings; and/or

- the structured mesh is a squared mesh or a hexagonal mesh or a triangle mesh or an octagonal mesh; and/or

- the mesh structure is a random mesh, for example a Voronoid mesh; and/or at least 50%, for example at least 80%, for example at least 99%, for example all, of the optical elements have a constant optical power and a discontinuous first derivative between two contiguous optical elements; and/or at least 50%, for example at least 80%, for example at least 99%, for example all, of the optical elements have a varying optical power and a continuous first derivative between two contiguous optical elements; and/or at least 50%, for example at least 80%, for example at least 99%, for example all, of the optical element has an optical function of focusing an image on a position other than the retina in standard wearing conditions; and/or at least 50%, for example at least 80%, for example at least 99%, for example all, optical elements have a non-spherical focused optical function in standard wearing conditions and for peripheral vision; and/or at least 50%, for example at least 80%, for example at least 99%, for example all, of the optical elements has a cylindrical power; and/or

- the optical elements are configured so that along at least one, for example along at least 8 equally distributed, for example all, section(s) of the lens element, for example a section passing by the reference point, for example the optical center, of the lens element, the mean sphere of optical elements increases from a point of said section towards the peripheral part of said section; and/or

- the optical elements are configured so that along at least one, for example along at least 6 equally distributed, for example along all, section(s) of the lens the cylinder of optical elements increases from a point of said section towards the peripheral part of said section; and/or

- the optical elements are configured so that along at least one, for example along at least 6 equally distributed, each section passing through the centers of 6 optical elements arranged in regular ways around the reference point of the lens element; and/or

- the optical elements are configured so that along the at least one, for example along at least 8 equally distributed, for example along all, section(s) of the lens the mean sphere and/or the cylinder of optical elements increases from the center of said section towards the peripheral part of said section; and/or

- the refraction area comprises an reference point, for example the optical center, and the optical elements are configured so that along at least one, for example along at least 6 equally distributed, for example all, section(s) passing through the reference point, for example the optical center, of the lens the mean sphere and/or the cylinder of the optical elements increases from the reference point, for example the optical center, towards the peripheral part of the lens; and/or

- the refraction area comprises a far vision reference point, a near vision reference, and a meridian joining the far and near vision reference points, the optical elements are configured so that in standard wearing conditions along at least one, for example at least 8 equally distributed, for example all horizontal section of the lens the mean sphere and/or the cylinder of the optical elements increases from the intersection of said horizontal section with the meridian towards the peripheral part of the lens; and/or

- the mean sphere and/or the cylinder increase functions along the sections are different depending on the position of said section along the meridian; and/or

- the mean sphere and/or the cylinder increase functions along the sections are unsymmetrical; and/or

- the optical elements are configured so that in standard wearing conditions the at least one section is a horizontal section; and/or

- the mean sphere and/or the cylinder of optical elements increases from a first point of said section towards the peripheral part of said section and decreases from a second point of said section towards the peripheral part of said section, the second point being closer to the peripheral part of said section than the first point; and/or

- the mean sphere and/or the cylinder increase function along the at least one section is a Gaussian function; and/or - the mean sphere and/or the cylinder increase function along the at least one section is a Quadratic function; and/or

- the optical elements are configured so that the mean focus of the light rays passing through each optical element is at a same distance to the retina; and/or

- the refractive area is formed as the area other than the areas formed as the plurality of optical elements; and/or at least part, for example all, of the optical elements are located on the front surface of the lens element; and/or

- the at least one multifocal refraction lenslet comprises a cylindrical power; and/or

- the at least one, for example all, multifocal refractive lenslet comprises 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 lenslet; and/or at least one multifocal refractive lenslet comprises a toric surface; and/or at least part, for example all, optical functions comprise high order optical aberrations.

BRIEF DESCRIPTION OF THE DRAWINGS

Non-limiting embodiments of the disclosure will now be described with reference to the accompanying drawing wherein: o Figure 1 illustrates a front view of a lens element according to first embodiment of the disclosure; o Figures 2A and 2B illustrate a profile view a lens element according to two embodiments of the disclosure; o Figure 3 illustrates a front view of a lens element according to a second embodiment of the disclosure; and o Figures 4A and 4B illustrates a front view of a lens element according to a third embodiment of the disclosure.

Elements in the figures are illustrated for simplicity and clarity and have not necessarily been drawn to scale. For example, the dimensions of some of the elements in the figure may be exaggerated relative to other elements to help to improve the understanding of the embodiments of the present disclosure. DETAILED DESCRIPTION OF EMBODIMENTS OF THE DISCLOSURE

The disclosure relates to a lens element intended to be worn by a wearer.

In the reminder of the description, terms like « up », « bottom », « horizontal », « vertical », « above », « below », « front », « rear » or other words indicating relative position may be used. These terms are to be understood in the wearing conditions of the lens element.

In the context of the present disclosure, the term "optical lens" can refer to an uncut optical lens or a spectacle optical lens edged to fit a specific spectacle frame or an ophthalmic lens and an optical device adapted to be positioned on the ophthalmic lens. The “optical lens” in the context of the present disclosure may have a coating such as a hardcoat.

As represented in figures 1 to 4, the optical lens LI, L2 according to the disclosure comprises a refraction area 12 and a plurality of optical elements 14.

The optical elements 14 of the optical lens according to the disclosure may have different shape and/or optical function or a combination of such shape and optical function.

For example, the optical elements may be spherical lenslets, i.e. having a spherical optical function. An example of myopia control solution with spherical lenslets is disclosed in US20170131567.

For example, the optical elements may be non-spherical lenslets, i.e. having an optical function with at least two focal points. For example, a non-spherical lenslets may have a continuous power evolution over its surface.

For example, the optical elements may be “bifocal” lenslets comprising a central part within an annular part. The annular part providing an additional optical power and the center part providing an optical power based on the prescription of the wearer.. The refraction area comprises a plurality of respectively independent islandshaped areas. Typically, the refraction area is formed as the area other than the optical elements and each refraction island shape area is within one optical element. For example, the optical elements have an annular shape around a refraction area. An example of such configuration is described in WO2021198362.

According to an embodiment of the disclosure, the optical element may be placed on structure network, for example a squared or hexagonal network or a random network. Typically lens element may comprise a plurality of contiguous lenslets arranged on such structured network having an island shape refraction area within the structured network. Such structured may be obtained by stamping on a single vision lens. An example of such configuration is described in WO2019166657.

For example, the optical elements are Pi-Fresnel lenslets. For example, a face of the lens element is fully covered with a plurality of contiguous Fresnel type optical elements. The optical element be a Fresnel type optical element whose phase function y(r) has TI phase jumps at the nominal wavelength Xo. One may give these structures the name “Pi-Fresnel lenses” for clarity’s sake, as opposition to unifocal Fresnel lenses whose phase jumps are multiple values of 2K. Examples of such configurations are disclosed in WO2019206569 and WO2021001524.

For example, the optical elements may be a set of torus concentric rings. An example of such configuration is disclosed in WO2019166657.

As represented in figure 2A, the optical lens comprises at least a first surface and a second surface opposed to the second surface. For example, the first surface may comprise an object side surface Fl formed as a convex curved surface toward an object side and the second surface may comprise an eye side surface F2 formed as a concave surface having a different curvature than the curvature of the object side surface. The lens element LI, L2 may be made of organic material, thermoset or thermoplastic material, for example polycarbonate, or made of mineral material such as glass. The lens element LI, L2 may also be made of two layers of abovementioned materials having a different refractive index. Whatever the lens is made of one or more materials, the disposition of the optical element may be similar to the figure 1, figure 3 or figure 4 type.

With reference to figure 2B, an optical element 10 may include a thermoplastic layer 32 and a thermoset layer 34. Optical elements 14 may be formed within/on a first surface 36 of the thermoplastic layer 32. As in figure 2B, the first surface 36 of the thermoplastic layer 32 may be processed such that the optical elements 14 thereon appear to be debossed within the first surface 36 of the thermoplastic layer 32. As can be appreciated, the optical elements 14 on the first surface 36 of the thermoplastic layer 32 may be hemispherical (spherical or not) and of a concave shape or protruding towards the object side of the lens element.

Advantageously, the front and/or back surfaces of the lens element are smooth.

In the sense of present disclosure, the term “smooth” refers to a state of surface of a lens element in which the unevenness of said surface is smaller than or equal to 0.5 pm, for example smaller than or equal to 0.4 pm. The term “unevenness of a surface” refers to the difference between a maximum value and a minimum value of the deviation distance from the most approximate sphere. The term “most approximate sphere” is a spherical shape calculated from a measured value (height distribution) of the surface using the least squares method.

From the viewpoint of the average surface power, the term “smooth” may be defined as follows. The term “smooth” refers to the state of a surface whose rate of change in the average surface power (unit: D) at a given position of the surface in a given direction is smaller than or equal to 0.5 D/mm, for example smaller than or equal to 0.4 D/mm.

The term “smooth” may also be defined as a state in which the difference between the minimum value and the maximum value of the average surface power is smaller than the difference (the power added by the filled segments) between the minimum value and the maximum value of the transmission power.

In an embodiment, the thermoset layer 34 may be, generally, made of a crosslinked material (e.g., thermosetting materials). In particular, the thermoset layer 34 may be one obtained by polymerization of allyl derivatives such as the allyl carbonates of linear or branched aliphatic or aromatic polyols. This may further include diethylene glycol bis(allyl carbonate), isopropylene bis phenol-A bis(allyl carbonate), poly(meth)acrylates and copolymers based substrates, polythio(meth)acrylates, thermosetting polyurethanes, polythiourethanes, polyepoxides, polyepisulfides, as well as copolymers thereof and blends thereof. In an embodiment, the thermoset layer 34 may be an Orma® (Essilor) substrate and the like, such as one obtained by (co)polymerizing bis allyl carbonate of diethylene glycol, marketed by PPG Industries as CR-39®. The thickness of layer 32 and layer 34 may be similar (between 500pm and 1mm thick) or very different (e.g . one of the two layers having a thickness smaller than 400pm and the other one having a thickness greater than 1mm.

As illustrated in figures 1 to 4, the lens element LI, L2 comprises a refraction area 12.

The refraction area 12 has a refractive power Px based on the prescription of the eye of the wearer, for example of the person for which the optical lens is adapted. The prescription is for example adapted for correcting an abnormal refraction of the eye of the wearer of the optical lens. The term “prescription” is to be understood to mean a set of optical characteristics of optical power, of astigmatism, of prismatic deviation, determined by an ophthalmologist or optometrist in order to correct the vision defects of the eye, for example by means of a lens positioned in front of his eye. For example, the prescription for a myopic eye comprises the values of optical power and of astigmatism with an axis for the distance vision.

The prescription may comprise an indication that the eye of the wearer has no defect and that no refractive power is to be provided to the wearer. In such case the refractive area is configured so as to not provide any refractive power.

The refraction area is preferably formed as the area other than the areas formed of the plurality of optical elements. In other words, the refraction area is the complementary area to the areas formed of the plurality of optical elements.

According to an embodiment of the disclosure, the refraction area may comprise a plurality of respectively independent island-shaped areas. For example, each refraction island shape area is within one optical element.

Such an arrangement of refraction area is disclosed in WO2021198362.

As illustrated in figures 1, 3 and 4, the refraction area 12 may comprise at least the central zone of the optical lens 10.

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

The central zone may be centered on a reference point of the optical lens 10. The reference point on which the central zone may be centered is either one of a geometrical center and/or an optical center and/or a near vision reference point and/or a far vision reference point of the optical lens.

Preferably, the central zone is centered on, or at least comprises a framing reference point that faces the pupil of the wearer gazing straight ahead in standard wearing conditions.

The wearing conditions are to be understood as the position of the optical lens with relation to the eye of a wearer, for example defined by a pantoscopic angle, a Cornea to lens distance, a Pupil-cornea distance, a center of rotation of the eye (CRE) to pupil distance, a CRE to lens distance and a wrap angle.

The Cornea to lens distance is the distance along the visual axis of the eye in the primary position (usually taken to be the horizontal) between the cornea and the back surface of the lens; for example equal to 12mm.

The Pupil-cornea distance is the distance along the visual axis of the eye between its pupil and cornea; usually equal to 2mm.

The CRE to pupil distance is the distance along the visual axis of the eye between its center of rotation (CRE) and cornea; for example equal to 11.5mm.

The CRE to lens distance is the distance along the visual axis of the eye in the primary position (usually taken to be the horizontal) between the CRE of the eye and the back surface of the lens, for example equal to 25.5mm.

The pantoscopic angle is the angle in the vertical plane, at the intersection between the back surface of the lens and the visual axis of the eye in the primary position (usually taken to be the horizontal), between the normal to the back surface of the lens and the visual axis of the eye in the primary position; for example equal to -8°, preferably equal to 0°.

The wrap angle is the angle in the horizontal plane, at the intersection between the back surface of the lens and the visual axis of the eye in the primary position (usually taken to be the horizontal), between the normal to the back surface of the lens and the visual axis of the eye in the primary position for example equal to 0°.

An example of standard wearing condition may be defined by a pantoscopic angle of -8°, a Cornea to lens distance of 12 mm, a Pupil-cornea 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°.

Another example of standard wearing condition more adapted for younger wearers may be defined by a pantoscopic angle of 0°, a Cornea to lens distance of 12 mm, a Pupil-cornea 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°.

The central zone may comprise the optical center of the optical lens and have a characteristic dimension greater than 4mm - corresponding to +/- 8° peripheral angle on the retina side, and smaller than 22mm corresponding to +/- 44° peripheral angle on the retina side, for example smaller than 20 mm corresponding to +/- 40° peripheral angle on the retina side. The characteristic dimension may be a diameter or the major or minor axes of an ellipse shaped central zone. The refraction area 12 may comprise a continuous variation of refractive power. For example, the refractive area may have a progressive addition design. The optical design of the refraction area may comprise a fitting cross where the optical power is negative, and a first zone extending in the temporal side of the refractive area are when the lens element is being worn by a wearer. In the first zone, the optical power increases when moving towards the temporal side, and over the nasal side of the lens, the optical power of the ophthalmic lens is substantially the same as at the fitting cross. Such optical design is disclosed in greater details in W02016/107919.

Alternatively, the refractive power in the refraction area 12 may comprise at least one discontinuity.

As illustrated in figures 1 to 3, the optical lens LI, L2 comprises a plurality of optical elements 14 and a zone of interest 20 comprising a plurality of said optical elements 14.

At least 50%, for example at least 80%, for example all, of a surface of the optical element LI, L2 is covered by at least one layer of coating element. The at least one layer of coating element may comprise features selected from the group consisting of anti-scratch, anti-reflection, anti-smudge, anti-dust, UV30 filtration, blue lightfiltration, anti-abrasion features.

The layer of coating element may be provided using any known techniques. For example, the layer of coating may be provided using a dipping process where the optical lens simultaneously receives a layer of coating on each surface.

The optical elements have a transparent optical function of not focusing an image on the retina of the eye of the wearer when the optical lens is worn in standard wearing conditions.

In other words, when the wearer wears the lens element, for example in standard wearing conditions, rays of light passing through the plurality of optical elements will not focus on the retina of the eye of the wearer. For example, the optical elements may focus in front and/or behind the retina of the eye of the wearer.

Advantageously, not focusing an image on the retina of the wearer allows creating a control signal that suppresses, reduces, or at least slows down the progression of abnormal refractions, such as myopia or hyperopia, of the eye of the person wearing the lens element.

In the sense of the disclosure, an optical element is considered to have a transparent optical function when said optical element absorbs less than 50%, for example less than 20%, for example less than 5% of the light over the visible spectrum, i.e. 380 nm to 750 nm.

The optical elements may be optical elements, such as lenslets providing an additional optical power relative to the power based on the prescription of said eye of the person.

Examples of such configuration of optical elements are disclosed in WO2019166659 which content is included by reference in this application.

As illustrated on figure 1, according to an embodiment of the disclosure, the optical elements are positioned along a plurality of concentric rings. Each ring may consist of contiguous optical elements. Advantageously, such configuration provides an excellent comprises between the myopia control function of the optical elements and the visual acuity provided by the lens element.

In other words, the optical elements may be organized in groups of contiguous optical elements. Each group of contiguous optical elements may be organized in concentric rings, for example at least 5 concentric rings, for example 11 concentric rings, having the same center. The concentric ring of each group of contiguous optical element being defined by an inner diameter corresponding to the smallest circle that is tangent to at least one optical element of said group and an outer diameter corresponding to the largest circle that is tangent to at least one optical elements of said group.

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

According to an embodiment of the 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 two successive concentric rings being defined by the difference between the outer diameter of a first concentric ring and the inner diameter of a second concentric ring, the second concentric ring being closer to the periphery of the lens element.

As illustrated on figure 3, according to an embodiment of the disclosure, the optical elements are positioned according to a structured mesh, in the illustration of figure 3 such mesh is a hexagonal mesh, which allows a good comprise between the myopia control function of the optical elements and the visual acuity provided by the lens element. Alternatively, the mesh would also be a squared mesh.

As illustrated on figure 3, 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 the invention, two optical elements are considered non-contiguous if there is no path between reference points, for example the centers, of the two optical elements that does not pass an area having the refractive power.

As illustrated on figures 4A and 4B, according to an embodiment of the disclosure, the optical elements have an annular shape limited by an inner diameter and outer diameter.

According to such embodiment, the optical elements correspond to part of pure cylindrical concentric rings. In this example, the optical elements have constant power but a variable cylindrical axis.

For example, the optical elements correspond to a series of torus concentric rings.

Each optical element has also a geometrical center. All the optical elements are positioned such that their geometrical center is at the same location, for example on the optical center of the lens element. The width of the annular shapes and the distances separating 2 neighboring annular shapes impacts the trade-off between the myopia control function of the optical elements and the visual acuity provided by the lens element.

As illustrated on figure 2, a lens element 10 according to the disclosure comprises an object side surface Fl, for example formed as a convex curved surface toward an object side, and an eye side surface F2 for example formed as a concave surface having a different curvature than the curvature of the object side surface Fl.

At least part, for example all, of the optical elements may be located on the front surface of the lens element.

At least part, for example all, of the optical elements may be located on the back surface of the lens element.

At least part, for example all, of the optical elements may be located between the front and back surfaces of the lens element. For example, the lens element may comprise zones of different refractive indexes forming the optical elements as illustrated on figure 2B. Examples of such configuration are provided in WO2023104982A1.

At least one of the optical elements may have an optical function of focusing an image on a position other than the retina.

Preferably, at least 50%, for example at least 80%, for example at least 99%, for example all, of the optical elements may have an optical function of focusing an image on a position other than the retina. All of the optical elements may be configured so that the mean focus of the light rays passing through each optical element is at a same distance to the retina of the wearer.

The optical function, in particular the dioptric function, of each optical element may be optimized so as to provide a focus image, for example in peripheral vision, at a constant distance of the retina of the eye of the wearer. Such optimization requires adapting the dioptric function of each of the optical element depending on their position on the lens element.

The optical elements may be configured so that at least along one section, for example along at least 8 evenly spread sections, of the lens the average addition optical power the optical elements varies monotonically from a point of said section at a distance smaller than 9 mm from the point of reference of the lens towards the periphery of said section at least to a point at 50 mm from the point of reference of the lens element.

At least part of the optical elements, for example at least 50%, for example at least 80%, for example at least 99%, for example all of the optical elements are mutifocal lenslets. Advantageously, such multifocal lenslet 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 other than on the retina of the wearer.

According to an alternative of the disclosure, at least 50%, for example at least 80%, for example at least 99%, for example all of the optical elements are Pi-Fresnel lenslets, for example contiguous Pi-Fresnel lenslets.

In the context of the present disclosure, two optical elements are to be considered contiguous if there is a path linking the two optical elements all along which one may measure in standard wearing conditions at least one optical power different from the optical power based on the prescription of the wearer, for example for correcting an abnormal refraction of the eye of the wearer.

According to an embodiment of the disclosure, at least 50%, for example at least 80%, for example at least 99% for example all of the optical elements, has discontinuities, such as a discontinuous surface, for example Fresnel surfaces and/or having a refractive index profile with discontinuities.

Examples of Pi-Fresnel lenslets are disclosed in WO2019206569.

According to an embodiment of the disclosure, at least 50%, for example at least 80%, for example at least 99% for example all of the optical elements are diffusive lenslets or scattering elements as disclosed in WO2022074243. The lens element according to the invention is particularly adapted for myopia control due to the fact that over at least a 6 mm diameter pupil whose center is at 7.5 mm from a reference point, for example the optical center, of the lens element the standard deviation of the optical power distribution over said 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.

The inventors have observed that having a large standard deviation of the optical power distribution increases the myopia control effect of lenses element according to the disclosure.

The optical power distribution can be determined by using a deflectometry method, for example providing an image consisting of pixels smaller than or equal to 0.05mm x 0.05mm.

In the sense of the disclosure, the feature “image used” corresponds to the result of the transformation of the images acquired by an image acquisition device by using the algorithm.

The optical power distribution may be determined using a two-dimension representation of the local optical power obtained using a commercially available lens mapper such as the NIMO™ solutions proposed by the company Lambda-X.

Such solutions are commercially proposed for mapping contact lenses and may require adaptation for larger lenses such as spectacle lenses.

In such a case, the lens element is located in the horizontal plane of the measuring device and can be shifted in the different x- and y- directions as illustrated on figure 4. In the case of the Nimo solutions, the optical center of the lens element is not systematically aligned with the collimated measurement beam. Furthermore, on the current version of the Nimo solutions, there is no gripper allowing to center the lens element, thus the inventors propose to use the raw view of the fringe pattern visible in real time thanks to the camera video mode and ensure it is centred.

Therefore, it is clear that a deflectometry method allows obtaining an accurate two-dimension representation of the local power of at least part of the lens element.

Advantageously, a deflectometry method, for example the fringe deflectrometry method, is much easier, cheaper and shorter to implement than the surface measurement.

According to an embodiment of the disclosure, the optical power distribution can be represented as a histogram with a bin greater than or equal to 0.1 diopters, for example greater than or equal to 0.25 diopters, and smaller than or equal to 0.8 diopters, for example smaller than or equal to 0.6 diopters. For example, the bin is equal to 0.5 diopters.

According to an embodiment of the present disclosure, one may identify at least four pupils of 6 mm diameters, for example at least over eight pupils of 6 mm diameters, whose centers are at 7.5 mm from the reference point, for example the optical center, of the lens element over which the standard deviation of the optical power distribution over 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, said four pupils, for example said for eight pupils, being evenly spread along a circle of 7.5 mm radius centered on the reference point, for example the optical center, of the lens element.

Advantageously, having an even distribution of the pupils over which the standard deviation of the optical power distribution over 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 increases the efficiency of the myopia control solution.

According to an embodiment of the present disclosure, one may identify at least twenty pupils of 6 mm diameters whose centers are at 7.5 mm from the reference point, for example the optical center, of the lens element over which the standard deviation of the optical power distribution over 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, said twenty pupils being evenly spread along a circle of 10 mm radius centered on the reference point, for example the optical center, of the lens element.

Advantageously, having an even distribution of the at least twenty pupils over which the standard deviation of the optical power distribution over 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 increases the efficiency of the myopia control solution, in particular in the different gazing directions.

According to an embodiment of the present disclosure, one may identify at least one pupil of 6 mm diameter, for example at least four pupils of 6 mm diameters, for example at least over eight pupils of 6 mm diameters, whose center is at 10 mm from the reference point, for example the optical center, of the lens element the standard deviation of the optical 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, for example none of the said four pupils, for example the said at least eight pupils, overlap with each other.

Advantageously, having pupils over which the standard deviation of the optical power distribution over 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 at 10 mm from the reference point increases the efficiency of the myopia control solution in particular in peripherical vision.

According to an embodiment of the present disclosure, one may identify at least four pupils of 6 mm diameters, for example at least over eight pupils of 6 mm diameters, whose centers are at 10 mm from the reference point, for example the optical center, of the lens element over which the standard deviation of the optical power distribution over 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, said at least four pupils, for example said at least eight pupils, being evenly spread along a circle of 10 mm radius centered on the reference point, for example the optical center, of the lens element.

Advantageously, having an even distribution of pupils over which the standard deviation of the optical power distribution over 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 increases the efficiency of the myopia control solution, in particular in the different gazing directions.

According to an embodiment of the present disclosure, one may identify at least one pupil of 6 mm diameter, for example at least four pupils of 6 mm diameters, for example at least over eight pupils of 6 mm diameters, whose center is at 12.5 mm from the reference point, for example the optical center, of the lens element the standard deviation of the optical power distribution over 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, for example none of the said four pupils, for example the said at least eight pupils, overlap with each other.

Advantageously, having pupils over which the standard deviation of the optical power distribution over 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 at 12.5 mm from the reference point increases the efficiency of the myopia control solution in particular in peripherical vision. The disclosure has been described above with the aid of embodiments without limitation of the general inventive concept. Many further modifications and variations will be apparent to those skilled in the art upon making reference to the foregoing illustrative embodiments, which are given by way of example only and which are not intended to limit the scope of the disclosure, that being determined solely by the appended claims.

In the claims, the word “comprising” does not exclude other elements or steps, and the indefinite article “a” or “an” does not exclude a plurality. The mere fact that different features are recited in mutually different dependent claims does not indicate that a combination of these features cannot be advantageously used. Any reference signs in the claims should not be construed as limiting the scope of the disclosure.

Claims

1. Lens element, for example a myopia control lens element, adapted for a wearer, said lens element providing a first optical function having a power based on the 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 which is different from the first optical function; wherein over at least a 6 mm diameter pupil whose center is at 7.5 mm from a reference point, for example the optical center of the lens element, the standard deviation of the optical power distribution over said 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.

2. The lens element according to claim 1, wherein over at least four pupils of 6 mm diameters, for example at least over eight pupils of 6 mm diameters, whose centers are at 7.5 mm from the reference point, for example the optical center, of the lens element the standard deviation of the optical power distribution over 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, said four pupils, for example said for eight pupils, being evenly spread along a circle of 7.5 mm radius centered on the reference point, for example the optical center, of the lens element.

3. The lens element according to any of the preceding claims, wherein over at least twenty pupils of 6 mm diameters whose centers are at 7.5 mm from the reference point, for example the optical center, of the lens element the standard deviation of the optical power distribution over 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, said twenty pupils being evenly spread along a circle of 10 mm radius centered on the reference point, for example the optical center, of the lens element.

4. The lens element according to any of the preceding claims, wherein over at least one pupil of 6 mm diameter, for example at least four pupils of 6 mm diameters, for example at least over eight pupils of 6 mm diameters, whose center is at 10 mm from the reference point, for example the optical center, of the lens element the standard deviation of the optical 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, for example none of the said four pupils, for example the said at least eight pupils, overlap with each other.

5. The lens element according to any of the preceding claims, wherein over at least four pupils of 6 mm diameters, for example at least over eight pupils of 6 mm diameters, whose centers are at 10 mm from the reference point, for example the optical center, of the lens element the standard deviation of the optical power distribution over 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, said at least four pupils, for example said at least eight pupils, being evenly spread along a circle of 10 mm radius centered on the reference point, for example the optical center, of the lens element.

6. The lens element according to any of the preceding claims, wherein over at least one pupil of 6 mm diameter, for example at least four pupils of 6 mm diameters, for example at least over eight pupils of 6 mm diameters, whose center is at 12.5 mm from the reference point, for example the optical center, of the lens element the standard deviation of the optical power distribution over 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, for example none of the said four pupils, for example the said at least eight pupils, overlap with each other.

7. The lens element according to the preceding claims, wherein the lens element has a center area comprising the reference point, for example the optical center, of the lens element free of optical elements and providing the first optical function.

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

9. The lens element according to the preceding claim, wherein each concentric ring consists of a plurality of contiguous optical elements.

10. The lens element according to any of claims 8 or 9, wherein the concentric rings of optical elements have an inner diameter comprised between 9.0 mm and 60 mm, the inner diameter corresponding to the smallest circle that is tangent to at least one optical element of said circle.

11. The lens element according to any of the preceding claims, wherein at least 50%, for example at least 80%, for example at least 99%, of the optical elements are lenslets, for example having a spherical, aspherical optical function or “bifocal” lenslets.

12. The lens element according to any of the preceding claims, wherein at least 50%, for example at least 80%, for example at least 99%, of the optical elements are Pi- Fresnel lenslets.

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 contiguous optical elements.

14. The lens element according to any of the preceding claims, wherein each optical element has a contour shape being inscribable in a circle having a diameter greater than or equal to 0.1 mm, for example greater than 0.5 mm and smaller than or equal to 3.0 mm, for example smaller than or equal to 2.5 mm.

15. The lens element according to any of the preceding claims, wherein for every circular zone having a radius greater than or equal to 1 mm, for example greater than or equal to 2 mm, and smaller than or equal to 5 mm, for example smaller than or equal to 4 mm, comprising a geometrical center located at a distance of the framing reference that faces the pupil of the user gazing straight ahead in standard wearing conditions greater or equal to said radius + 4mm, for example +5 mm, for example +6 mm, the ratio between the sum of areas of the parts of optical elements located inside said circular zone and the area of said circular zone is greater than or equal to 20%, for example greater than or equal to 30% and smaller than or equal to 80%, for example smaller than or equal to 70%, for example smaller than or equal to 60%.