Department of Optics

Abstract

1. An optical system intended to be worn in front of a wearer's eye, comprising: an optical lens having at least one control point; an optical device comprising a plurality of optical elements, the optical device being attached to the surface of or encapsulated in an optical lens; Equipped with -Each optical element simultaneously performs two different optical functions, an optical system, in which the optical device and the optical lens are configured such that the absolute value of the difference between the measured refractive power at a point of the optical system, for example a control point, and the refractive power corresponding to the prescription of the wearer's eye is less than or equal to 0.12 diopters.

Description

[Technical field]

[0001] The present invention relates to optical systems that are intended to be worn in front of a wearer's eye to inhibit the progression of ocular refractive errors, such as myopia or hyperopia, and optical devices that are placed on or within an optical lens to add refractive power to said optical lens. [Background technology]

[0002] Myopia of the eye is characterized by the eye imaging distant objects in front of the retina, while hyperopia is characterized by the eye imaging distant objects behind the retina. Myopia is usually corrected with concave lenses, and hyperopia is usually corrected with convex lenses.

[0003] It has been observed that people, especially children, who use conventional single vision optical lenses to correct their vision can experience inaccurate imaging for two main reasons. When viewing a distant object, even when the image is focused on the central retina, the peripheral image can be focused behind the retina due to retinal curvature. Furthermore, when viewing a close-up object using the same lens, the image can be formed behind the retina even at the fovea due to adaptation lag.

[0004] Such poor imaging can affect the progression of myopia in such people, the majority of whom tend to have a worsening degree of myopia over time. [Prior art documents] [Non-patent literature]

[0005] [Non-Patent Document 1] Eyal Ben-Eliezer,Emanuel Marom,Naim Konforti,and Zeev Zalevsky.Experimental realization of an imaging system with an extended depth of field.Appl.Opt.,44(14):2792-2798,May 2005 Summary of the Invention [Problem to be solved by the invention]

[0006] Thus, there appears to be a need for a lens element that will prevent or at least slow the progression of ocular refractive errors such as myopia or hyperopia. [Means for solving the problem]

[0007] To this end, the present invention provides an optical system intended to be worn in front of a wearer's eye, comprising: an optical lens having at least one control point; an optical device comprising a plurality of optical elements, the optical device being attached to a surface of or encapsulated in an optical lens; Equipped with -Each optical element simultaneously has two different optical functions, The optical device and the optical lens are proposed to be configured such that the absolute value of the difference between the measured refractive power at a point of the optical system, for example a control point, and the refractive power corresponding to the prescription of the wearer's eye is less than or equal to 0.12 diopters.

[0008] Advantageously, by having an optical device with multiple optical elements that simultaneously provide two different optical functions, it is possible to have an easily constructed optical system that, when worn by a wearer, slows the progression of ocular refractive errors such as myopia or hyperopia by focusing a portion of the light onto the wearer's retina for central vision and focusing a portion of the light either in front of or behind the wearer's retina for peripheral vision.

[0009] According to further embodiments, which may be considered alone or in combination, the optical device is configured such that, for at least one optical element, the absolute value of the difference between at least one refractive power measured through said optical element of said optical system and the actual refractive power measured only through the corresponding part of the optical lens is less than or equal to 0.25 diopters; and / or the first optical function has a mean refractive power of less than or equal to 0.25 diopters and may be, for example, a spherical or sphero-torical optical function; and / or the second optical function of at least some of the optical elements has a mean refractive power of 0.5 diopters or more; and / or a second optical function of at least some of the optical elements is such that, when the optical system is worn under normal wearing conditions, it does not focus an image on the retina of the eye, thereby slowing down the progression of refractive errors of the eye; and / or the second optical function of at least some of the optical elements is an aspheric optical function, and / or a first optical function of at least some of the optical elements is such that, when the optical system is worn under normal wearing conditions, it focuses an image on the retina of the eye, at least in central vision; and / or the optical device is attached to the front surface of the optical lens, the rear surface of the optical lens, or a surface included between the front and rear surfaces of the optical lens; and / or at least a portion of the optical element is continuous, and / or - all optical elements are continuous, and / or at least some, e.g. all, of the optical elements are arranged along a plurality of concentric rings; and / or at least some, for example all, of the optical elements are made of a birefringent material; and / or at least some, for example all, of the optical elements are diffractive lenses; and / or the diffractive lens has two main diffraction orders, the first main diffraction order providing a first mean refractive power of less than or equal to 0.25 diopters in absolute value and the second main diffraction order providing a second mean refractive power of more than or equal to 0.5 diopters; and / or at least some, for example all, of the optical elements are π-Fresnel lenses; and / or at least some, e.g. all, of the diffractive lenses have a metasurface structure; and / or at least some, for example all, of the optical elements are multifocal binary components; and / or at least some, for example all, of the optical elements are pixelated lenses; and / or the optical system has zones without optical elements, for example said zones having control points, and / or the optical elements have a square or hexagonal contour and are arranged according to a predefined array, for example a square array or a hexagonal array; and / or at least some, e.g. all, of the optical elements are arranged such that each point of their contour is continuous with another optical element; and / or at least some, e.g. all, of the optical elements are arranged according to a predefined array, e.g. a square array or a hexagonal array, and / or the optical system comprises a prescription portion configured to provide a wearer in standard wearing conditions with a corrective optical function based on a wearer's prescription that corrects a refractive error of said eye of the wearer; and / or the optical lens is an edged optical lens intended to be mounted in a spectacle frame, at least one surface of the optical lens being covered entirely with a plurality of optical elements; and / or the optical lens is an edged optical lens intended to be mounted in a spectacle frame, the entire aperture of the optical lens being covered by a plurality of optical elements; and / or - the difference between the refractive power of the corrective optical function and the average refractive power of the second optical function is 0.5 D or more; and / or each optical element has an optical axis; and / or at least some, e.g. all, of the optical elements have a shape configured to create a caustic surface in front of the retina of the wearer's eye; and / or At least some, for example all, of the optical elements have optical functions that have high-order optical aberrations.

[0010] The present disclosure relates to an optical device intended to be placed on a surface of an optical lens and adding refractive power to said optical lens, forming for example an optical system according to the invention, said optical device comprising a plurality of optical elements, each optical element having: - a first mean refractive power of 0.25 diopters or less in absolute value; and Second mean refractive power of -0.5 diopters or more The optical system has two different optical functions that provide simultaneous

[0011] According to further embodiments, which may be considered alone or in combination, at least some of the optical elements are continuous; and / or - all optical elements are continuous, and / or at least some, e.g. all, of the optical elements are arranged along a plurality of concentric rings; and / or at least some, for example all, of the optical elements are made of a birefringent material; and / or at least some, for example all, of the optical elements are diffractive lenses; and / or the diffractive lens has two main diffraction orders, the first main diffraction order providing a first mean refractive power of less than or equal to 0.25 diopters in absolute value and the second main diffraction order providing a second mean refractive power of more than or equal to 0.5 diopters; and / or the second optical function of at least some of the optical elements is an aspheric optical function, and / or at least some, for example all, of the optical elements are π-Fresnel lenses; and / or at least some, e.g. all, of the diffractive lenses have a metasurface structure; and / or at least some, for example all, of the optical elements are multifocal binary components; and / or at least some, for example all, of the optical elements are pixelated lenses; and / or the optical device has a zone free of optical elements, and / or at least some of the optical elements, for example all of them, have a square or hexagonal contour and are arranged according to a predefined array, for example a square array or a hexagonal array, arranged on at least one of the surfaces of the lens element, and / or at least some, e.g. all, of the optical elements are arranged according to a predefined array, e.g. a square array or a hexagonal array, covering the entire aperture of the lens element; and / or At least some, e.g. all, of the optical elements are arranged according to a predefined array having completely contiguous optical elements; and / or the optical device is rigid or flexible, and / or the optical device is one of a film, a patch, or a wafer; and / or the optical device has a mean radius of curvature between 88 mm and 53 mm, preferably 66 mm; and / or the optical device has an average thickness, measured perpendicular to at least one face of the device, between 0.5 mm and 5 mm; and / or the optical device comprises a transparent material having a Shore A hardness of 70 to 95; and / or the optical device comprises a transparent material with a light scattering percentage of between 0.4% and 2.0%, preferably less than 1%, and / or the optical device comprises a transparent thermoplastic material selected from the following polymers: polyurethane, polyvinyl chloride, polyethylene terephthalate, poly(methyl methacrylate), and polycarbonate; and / or the optical device comprises a transparent material selected from among polyurethane thermoplastics and polyvinyl chloride thermoplastics; and / or each optical element has an optical axis; and / or at least one, e.g. all, of the optical elements have a shape configured to create a caustic surface in front of the retina of the wearer's eye; and / or At least some, for example all, of the optical elements have an optical function that includes high-order optical aberrations.

[0012] The present invention also relates to a method for providing an optical system intended to be worn in front of a wearer's eye, the method comprising the steps of: - providing an optical lens configured to provide a wearer in standard wearing conditions with a corrective refractive power based on a wearer's prescription that corrects the refractive error of said eye of the wearer; - providing an optical device according to the present disclosure; - forming an optical system by placing an optical device on a surface of an optical lens or by encapsulating an optical device in the optical lens; Includes.

[0013] The present disclosure further relates to a method of providing an optical system intended to be worn in front of a wearer's eye, the method comprising the steps of forming the optical system by encapsulating an optical device according to the present disclosure in an optical lens configured to provide to the wearer in standard wearing conditions a corrective optical power based on the wearer's prescription that corrects the refractive error of the wearer's eye, and placing the optical device on one surface of the optical lens.

[0014] The present disclosure also relates to a method of providing an optical system intended to be worn in front of a wearer's eye, the method comprising: - providing a semi-finished optical lens incorporating an optical device according to the present disclosure; - determining a posterior surface to be machined on said semi-finished optical system so as to match the prescription of the wearer; - machining a rear surface of the provided semi-finished optical lens to obtain a determined rear surface; Includes.

[0015] The present invention further relates to a method of providing an optical system intended to be worn in front of a wearer's eye, the method comprising the steps of casting the optical system and providing, during the casting step, an optical device according to the present disclosure.

[0016] BRIEF DESCRIPTION OF THE DRAWINGS Non-limiting embodiments of the present invention will now be described with reference to the accompanying drawings. [Brief description of the drawings]

[0017] [Figure 1a] 1 is a schematic outline diagram of an optical system according to the present invention; [Figure 1b] FIG. 2 is a plan view of an optical system according to the present invention. [Diagram 2] 1 illustrates an example of an optical system covered with multiple successive Fresnel type optical elements. [Diagram 3] 3 illustrates an example of a first diffractive lens radius profile. [Figure 4] 4 illustrates an example of a second diffractive lens radius profile. [Diagram 5] 4 shows a π Fresnel lens radius profile. [Figure 6a] 1 shows the diffraction efficiency of a π Fresnel lens profile as a function of wavelength. [Figure 6b] 1 shows the diffraction efficiency of a π Fresnel lens profile as a function of wavelength. [Figure 7a] 1 illustrates a binary lens embodiment of the present invention. [Figure 7b] 1 illustrates a binary lens embodiment of the present invention. [Figure 7c] 1 illustrates a binary lens embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Elements in the figures are illustrated for simplicity and clarity and have not necessarily been drawn to scale, for example, the size of some of the elements in the figures may be exaggerated relative to other elements to help clearly illustrate embodiments of the present invention.

[0019] Detailed Description of the Invention Embodiments The present invention relates to optical systems, and in particular to optical systems and optical devices intended to be worn in front of a wearer's eye.

[0020] In the following description, terms such as "top", "bottom", "horizontal", "vertical", "upper", "lower", "front", "rear" or other terms indicating relative positions may be used. These terms should be understood in the context of the wearing conditions of the optical system.

[0021] In the context of the present invention, the term "optical lens" can refer to contact lenses, uncut lenses, spectacle optical lenses edged to fit into a particular eyeglass frame, or ophthalmic lenses.

[0022] In the context of the present invention, the term "optical device" refers to an optical device configured to be located on or within an optical lens. The optical device may be located on the front or back surface of the optical lens, between the front and back surfaces of the optical lens, or may be inserted into the optical lens. The optical device may be an optical patch, an optical film, or an optical wafer.

[0023] Optical system 10 according to the present disclosure is intended to be fitted to a wearer and worn in front of the wearer's eye.

[0024] As shown in FIG. 1a, an optical system 10 according to the present disclosure includes: an optical lens 20; an optical device 30 attached to a surface F1 of the optical lens; It may comprise:

[0025] The optical lens 20 includes at least one control point. For example, the control point may be the geometric center of the optical lens or the optical center of the optical lens. If the optical lens 20 is a progressive lens, the control point may be a fitting cross, a distance vision reference point, or a near vision reference point.

[0026] In the example presented in FIG. 1a, the optical lens has an object-side surface F1 formed, for example, as a convex curved surface facing the object side, and an eyeball-side surface F2 formed, for example, as a concave surface having a curvature different from that of the object-side surface F1.

[0027] According to one embodiment of the present invention, the optical device 30 is disposed in front of the optical lens 20 .

[0028] Alternatively, the optical device 30 may be disposed on the rear surface of the optical lens.

[0029] Alternatively, the optical device may be encapsulated in the optical lens, disposed between the front and rear surfaces of the optical lens.

[0030] As depicted in FIG. 1 b , an optical device 20 according to the present invention comprises a plurality of optical elements 14 .

[0031] The multiple optical elements may be arranged such that the optical system 10 comprises a prescription portion 12 configured to provide a corrective optical function based on a wearer's prescription to correct for the refractive error of the wearer's eye in standard wearing conditions.

[0032] The wearing conditions should be understood as the position of the lens elements relative to the wearer's eye, defined, for example, by the wide angle, the distance from the cornea to the lens, the distance from the pupil to the cornea, the distance from the center of eye rotation (CRE) to the pupil, the distance from the CRE to the lens, and the wrap angle.

[0033] The cornea-to-lens distance is the distance between the cornea and the rear surface of the lens along the visual axis of the eye (usually taken horizontally) in the first eye position and is, for example, equal to 12 mm.

[0034] The pupillocorneal distance is the distance along the visual axis of the eye between the pupil and the cornea and is usually equal to 2 mm.

[0035] The CRE-to-pupil distance is the distance between the eye's center of rotation along its visual axis (CRE) and the cornea, and is, for example, equal to 11.5 mm.

[0036] The CRE to lens distance is the distance between the CRE of the eye and the back surface of the lens along the visual axis of the eye (usually taken horizontally) in the first eye position and is, for example, equal to 25.5 mm.

[0037] The wide 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 first eye position (usually taken horizontally) and between the normal to the back surface of the lens and the visual axis of the eye in the first eye position, and is, for example, equal to -8°.

[0038] 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 first eye position (usually taken horizontally) and between the normal to the back surface of the lens and the visual axis of the eye in the first eye position, and is for example equal to 0°.

[0039] An example of a standard wearer condition may be defined by a wearing angle of -8°, a cornea to lens distance of 12 mm, a pupil-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°.

[0040] The term "actual refractive power" should be understood as being measured using a lensmeter.

[0041] The term "prescription" should be understood to mean a set of optical properties of power, astigmatism, prismatic deviation and axis determined by an ophthalmologist or optometrist to correct the wearer's vision defects, for example with a lens placed in front of the individual's eye. For example, a prescription for a myopic eye contains values ​​of power and astigmatism along the axis determined for distance vision.

[0042] Each optical element 14 of the plurality of optical elements simultaneously has two different optical functions, for example one optical axis.

[0043] The optical device and the optical lens may be configured such that the absolute value of the difference between one of the measured refractive powers at a point of the optical system, for example a control point, and the refractive power corresponding to the prescription of the wearer's eye is 0.12 diopters or less, for example 0.05 diopters or less.

[0044] An optical device according to the present disclosure may be configured such that, for at least one optical element, the absolute value of the difference between at least one refractive power measured through the optical element of the optical system and the actual refractive power through a corresponding portion of only the optical lens is 0.25 diopters or less, for example 0.12 diopters or less.

[0045] The optical function of each optical element 14 may be different from each other.

[0046] The first optical function may be a spherical optical function having a refractive power of 0.25 diopters or less, such as 0.12 diopters or less, or an optical function having a mean refractive power of 0.25 diopters or less, such as 0.12 diopters or less.

[0047] Thus, each optical element in combination with an optical lens may provide two refractive powers under normal wearing conditions: the refractive power corresponding to the first optical function provides a refractive power close to the prescribed refractive power, i.e. with a difference of 0.25 diopters or less.

[0048] A first optical function of at least a portion of the optical element may be such that, when the optical system is worn under normal wearing conditions, it images the central retina of the eye, regardless of the direction of eye gaze.

[0049] The second optical function of at least some of the optical elements may have a mean refractive power of 0.5 diopters or more, such as greater than 1 diopter.

[0050] A second optical function of at least some of the optical elements may be to not image onto the retina of the eye under said normal wearing conditions, slowing the progression of refractive error of the eye.

[0051] The second optical function of at least some of the optical elements may be an aspheric optical function.

[0052] Two optical functions differ at least in that their refractive powers differ from each other. In the sense of the present invention, two refractive powers are different if the absolute value of the difference between these two refractive powers is 0.25 diopters or more.

[0053] The optical elements included in the optical device may be continuous.

[0054] 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 and along the entire path at least one optical power different from the optical power based on the wearer's prescription that corrects the refractive error of the wearer's eye can be measured under standard wearing conditions.

[0055] In the context of this disclosure, all optical elements are to be understood as optical systems in which the two optical functions of the optical elements are continuous and can be measured at every point in the optical system.

[0056] In an optical system or device in which all optical elements are identical and are reproduced periodically, it is possible to determine for each of these optical elements the contour and therefore the "centre" (optical centre or geometric centre, e.g. centroid) of this optical element. An optical element should be considered "continuous" if the centres (C1, C2) of these optical elements are smaller than the dimension of the optical element in the direction C1C2.

[0057] Each optical element of the plurality of optical elements is transparent across the visible spectrum.

[0058] At least some, for example all, of the centers of the optical elements may be located in a predefined array of dots, for example an array of dots that includes dots arranged in a square or hexagon, or an array that includes randomly arranged dots.

[0059] Advantageously, the inventors have observed that for a given density of optics, by arranging at least some, e.g., all, of the optics along multiple concentric rings, the overall visual acuity of the lens element is increased. For example, a distance D between two adjacent concentric rings of optics of greater than 2.00 mm allows a larger area to be managed between the rings of optics, thus providing better overall visual acuity.

[0060] The optical element may cover a particular zone of the optical system, such as the center or any other area of ​​the optical lens, for example the periphery.

[0061] According to one embodiment, the optical device may have zones that are free of optical elements, for example said zones including control points.

[0062] For example, an annulus centered on the fitting cross and having a radius greater than 1.5 mm, such as greater than 2 mm, and less than 5 mm may be free of optical elements.

[0063] Different portions of the lens element may be free of optical elements depending on design requirements.

[0064] According to a preferred embodiment of the present disclosure, the optical lens is an edged optical lens intended to be mounted in an eyeglass frame, and at least one surface of the optical lens is entirely covered with a plurality of optical elements.

[0065] An example of such an embodiment is shown in FIG. 2, where the surface of the lens feature is completely covered with a plurality of contiguous diffractive optical elements.

[0066] The density of the optics or the amount of refractive power may be adjusted according to the zone of the optical device. Typically, the optics are located at the periphery of the optical device to increase the effect of the optics on myopia control, for example to compensate for peripheral defocus due to the peripheral shape of the retina.

[0067] Optical elements can be made using a variety of techniques such as direct surface machining, molding, casting or injection, embossing, deposition, or photolithography, etc. According to the invention, photolithography can be particularly advantageous, especially when one of the surfaces of the optical device is flat, or for producing a master from which a film or wafer can be replicated.

[0068] According to an embodiment of the invention, at least one, e.g. all, of the optical elements have a shape configured to create a caustic surface in front of the retina of the wearer's eye, in other words, such optical elements are configured such that if there is a plane on which the light beam converges, then any such planar cross section is located in front of the retina of the wearer's eye.

[0069] According to an embodiment of the invention, at least one, for example all, of the optical elements is made of a material different from the optical lens. In particular, the refractive index of the optical element may be different from the refractive index of the material of the optical device.

[0070] According to an embodiment of the present invention, at least one, for example all, of the optical elements are made of a birefringent material. In other words, the optical elements are made of a material that has a refractive index that depends on the polarization and the direction of propagation of the light. Birefringence can be quantified as the maximum difference between the refractive indices exhibited by the materials.

[0071] According to one embodiment of the invention, at least some, eg all, of the optical elements are diffractive lenses within the visible spectrum, eg wavelengths between 400 nm and 700 nm.

[0072] For example, at least some, e.g. all, of the optical elements are pixelate optical elements, such as pixelate lenses in which one out of two pixels is associated with each optical function. Examples of pixelate lenses are disclosed in Non-Patent Document 1.

[0073] According to one embodiment of the invention, at least one, eg all, of the optical elements has a discontinuity, such as a discontinuity, eg a Fresnel surface, and / or has a refractive index profile with discontinuities.

[0074] FIG. 3 illustrates an example of a first diffractive lens radial profile of an optical element that may be used in the present invention.

[0075] FIG. 4 illustrates an example of a second diffractive lens radial profile of an optical element that may be used in the present invention.

[0076] A diffractive lens may be a diffractive lens whose phase function ψ(r) has a π phase step at a nominal wavelength λ0, as seen in Figure 5. For clarity, these structures may be called "π Fresnel lenses", in contrast to monofocal Fresnel lenses, whose phase steps are multiples of 2π. A π Fresnel lens, whose phase function is shown in Figure 5, diffracts light primarily in two diffraction orders (orders 0 and +1) associated with dioptric powers P(λ0)=0δ and +1, e.g., P(λ0)=3δ. を diffracted, where λ0=550 nm.

[0077] The advantage of this design is that the diffractive orders directed to the wearer's prescription are not chromatic, while those used to provide the second optical function of slowing the progression of myopia are highly chromatic, advantageously allowing for increased comfort for the wearer.

[0078] Typical sizes of the optics may be 500 μm or more, preferably 2 mm or more, and 5 mm or less, preferably 2.5 mm or less. In practice, the inventors have observed that it is advantageous to keep the optics smaller than the pupil size of the wearer's eye.

[0079] For example, the diffraction efficiency of the 0th and +1st orders is approximately 40% at the nominal wavelength λ 0 .

[0080] To increase the efficiency of the diffraction orders corresponding to the wearer prescription, the following may be considered:

[0081] To increase the efficiency of the diffraction order 0, the value of λ0 can be reduced. Figure 6a shows the diffraction efficiency for λ0=550 nm, and Figure 6b shows the diffraction efficiency for λ0=400 nm. In this case, it can be noticed that the diffraction efficiency of order 0 is generally high throughout the visible spectrum, while the efficiency of order +1 is low. In this case, the dioptric power of the refractive phase function applying the phase jump should be equal to 1.5*400 / 550≈1.1δ at λ0=550 nm instead of 1.5δ in Figure 5, and therefore the order +1 corresponds to a dioptric power of 3δ at λ0=550 nm. This results in a wider ring in Figure 5.

[0082] Additionally or alternatively, one of the two rings in the configuration shown in Figure 5 may be set to zero. In this case, there are still two different functions at the same time due to the remaining π Fresnel ring, but the ring set to zero induces a more significant proportion of the 0 δ diopter power.

[0083] One could further consider applying a π-Fresnel structure made of materials with two different refractive indices and different Abbe numbers to obtain the phase function of FIG. 5 at λ=λ0, to obtain a more homogeneous effect in the visible spectrum and / or to privilege one of the two main diffraction orders over the other.

[0084] Other combinations with stacked π-Fresnel structures are also conceivable.

[0085] According to one embodiment of the present disclosure, at least one, for example all, of the optical elements is a multifocal binary component, for example a multifocal binary lens. The binary lens may have a radial profile with a discontinuity height of about 1 μm.

[0086] For example, the binary structure depicted in Fig. 7a shows mainly two dioptric powers, denoted -P / 2 and P / 2, corresponding to the two main diffraction orders. When associated with the refractive structure depicted in Fig. 7b, with a dioptric power of P / 2, the final structure depicted in Fig. 7c has dioptric powers 0δ and P. The illustrated case relates to P=3δ.

[0087] Advantageously, the diffraction efficiency of the -1 and 1 orders is approximately 40% at the nominal wavelength, and in addition, the diffraction efficiency remains high across the visible spectrum, typically greater than 35%.

[0088] According to one embodiment of the present disclosure, at least a portion, e.g., all, of the diffractive lenses have a metasurface structure, also referred to as a metalens.

[0089] For example, the lens element may comprise an array of simultaneous bifocal metalenses of dioptric powers P1, P2, where P1=0δ, and chromatic aberration is controlled.

[0090] Usually, P1=0δ can be achromatic or partially achromatic, meaning that it has the same focal point at each wavelength.

[0091] The chromatic properties of P2, such as focal length and efficiency, can be advantageously controlled.

[0092] The chromaticity of each metalens can vary as a function of the position of the metalens on the surface of the lens element: near, intermediate, or far viewing zone.

[0093] Each metalens itself can be made from an array of subwavelength elements.

[0094] For example, the sub-wavelength elements can have any shape, such as circular, rectangular, or elliptical, any dimensions, can be equidistant from one another, can all be aligned in the same direction, or can be rotationally aligned with one another.

[0095] The subwavelength elements of the metalens should be made from a high dielectric material.

[0096] Each metalens can be made from a combination of "sub-metalens". For example, by spatial multiplexing or stacking of several sub-metalens, bifocality can be obtained as a function of wavelength.

[0097] Bifocality can be obtained as a function of polarization by spatial multiplexing or stacking of several sub-metalenses.

[0098] According to one embodiment of the present disclosure, at least one, e.g., all, of the optical elements have an optical function having high-order optical aberrations, e.g., the optical elements are microlenses composed of continuous surfaces defined by Zernike polynomials.

[0099] The invention also relates to an optical device intended to be placed on a surface of an optical lens to add to the refractive power of said optical lens and to form, for example, an optical system as disclosed herein, said optical device comprising a plurality of optical elements, each optical element comprising: - a first mean refractive power of 0.25 diopters or less in absolute value; and Second mean refractive power of -0.5 diopters or more The optical system has two different optical functions that provide simultaneous

[0100] The optical elements of the optical device may include any combination of the features described above in relation to the optical system.

[0101] Depending on the embodiment, the optical device may be rigid or flexible. As previously disclosed, the optical device may be one of a film, a path, or a wafer.

[0102] The optical device may be attached to the surface of the optical lens by the inherent adhesive properties of the materials that make up the optical device or, where possible, by the use of a thin film of water between the two interfaces which acts as a medium to initiate contact between the optical device and the optical lens.

[0103] Thus, in this disclosure, the material from which the optical device is made preferably combines transparency and tackiness that allows it to retain the optical quality of the optical lens to which it is subjected, as well as physical properties that provide a specific flexibility to match the radius of curvature of the optical component to which it is attached.

[0104] Advantageously, the materials constituting the optical devices of the present disclosure have a Shore A hardness of 70-95 and a light scattering percentage of 2.0%-0.4%, preferably less than 1%.

[0105] Materials that may be used in the context of the present disclosure may in particular be transparent thermoplastic materials chosen, for example, from among the following polymers: polyurethane, polyvinyl chloride, polyethylene terephthalate, poly(methyl methacrylate) and polycarbonate. Preferably, the material constituting the optical device is chosen from among polyurethane thermoplastics and polyvinyl chloride thermoplastics.

[0106] The material of the optical lens can be inorganic or organic. As a non-limiting example, the organic material that can be used in the context of the present disclosure can be a material that is advantageously used in optics and ophthalmology. For example, suitable materials are substrates such as polycarbonate; polyamide; polyimide; polysulfone; poly(ethylene terephthalate) and polycarbonate copolymers; polyolefins, especially polynorbornene; diethylene glycol bis(allyl carbonate) polymers and copolymers; (meth)acrylate polymers and copolymers, especially polymers and copolymers of (meth)acrylate derivatives of bisphenol A; thio(meth)acrylate polymers and copolymers; urethane and thiourethane polymers and copolymers; epoxy polymers and copolymers, and episulfide polymers and copolymers.

[0107] The present invention has been described above with the aid of several embodiments, without limiting the general concept of the invention.

[0108] Many further modifications and variations will become apparent to those skilled in the art upon reference to the above-described exemplary embodiments, which are given by way of example only and are not intended to limit the scope of the invention, which is determined solely by the appended claims.

[0109] In the claims, the word "comprising" does not exclude other elements or steps, and the indefinite articles "a" or "an" do 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 used to advantage. Any reference signs in the claims should not be interpreted as limiting the scope of the invention. [Explanation of symbols]

[0110] 10 Optical system 12 Prescription Department 14 Optical elements 20 Optical Lenses 30 Optical Devices

Claims

1. 1. An optical system intended to be worn in front of a wearer's eye, comprising: an optical lens having at least one control point; an optical device comprising a plurality of optical elements, the optical device being attached to a surface of or encapsulated in said optical lens; Equipped with said control points are a zone free of optical elements, and / or the geometric center of the optical lens, and / or the optical center of the optical lens, and / or For progressive eyeglass lenses, Fitting cloth or Distance vision reference point, or near vision reference point, Either - each optical element simultaneously has two different optical functions, a first optical function of at least a part of said optical elements is to focus an image on the central retina of the eye, regardless of the direction of eye gaze, when said optical system is worn in a standard wearer situation; a second optical function of at least some of the optical elements is to not focus an image on the wearer's retina in a standard wearer condition, but to focus an image either in front of or behind the wearer's retina in peripheral vision, the optical device and the optical lens are configured such that the absolute value of the difference between the measured refractive power at the control point of the optical system and the refractive power corresponding to the prescription of the eye of the wearer is less than or equal to 0.12 diopters, an optical system, wherein at least some of said optical elements are diffractive lenses, said diffractive lenses having two main diffraction orders, a first main diffraction order providing a first mean refractive power less than or equal to 0.25 diopters in absolute value, and a second main diffraction order providing a second mean refractive power greater than or equal to 0.5 diopters.

2. The optical system of claim 1 , configured such that for at least one optical element, the absolute value of the difference between at least one refractive power measured through the optical element of the optical system and the actual refractive power through a corresponding portion of only the optical lens is 0.25 diopters or less.

3. The optical system of claim 1 , wherein the first optical function is an optical function having a mean refractive power of 0.25 diopters or less.

4. The optical system of claim 1 , wherein the second optical function of at least some of the optical elements has a mean refractive power of 0.5 diopters or greater.

5. 2. The optical system of claim 1, wherein a second optical function of at least some of the optical elements is to not focus an image onto the retina of the eye when the optical system is worn in a standard wearer condition, thereby slowing the progression of refractive error of the eye.

6. The optical system of claim 1 , wherein the optical device is attached to a front surface of the optical lens, a rear surface of the optical lens, or inserted inside the optical lens.

7. The optical system of claim 1 , wherein at least a portion of the optical elements are contiguous.

8. The optical system of claim 1 , wherein at least some of the optical elements are arranged along a plurality of concentric rings.

9. The optical system of claim 1 , wherein at least some of the optical elements are π-Fresnel lenses.

10. The optical system of claim 1 , wherein the optical elements have a square or hexagonal contour and are arranged according to a predefined array.

11. 1. An optical device intended to be placed on a surface of an optical lens and adding to the refractive power of said optical lens, said optical device comprising a plurality of optical elements, At least a portion of the optical element is a diffractive lens, the diffractive lens comprising: a first mean refractive power less than or equal to 0.25 diopters in absolute value, and a second mean refractive power of −0.5 diopters or more; An optical device having two different optical functions simultaneously providing:

12. 1. A method of providing an optical system intended to be worn in front of a wearer's eye, comprising: - providing an optical lens configured to provide a wearer in a standard wearer condition with a corrective refractive power based on the wearer's prescription to correct the refractive error of the wearer's eye; - providing an optical device according to claim 11, forming an optical system by placing said optical device on one surface of said optical lens or by encapsulating said optical device in said optical lens; The method includes:

13. 12. A method for providing an optical system intended to be worn in front of a wearer's eye, comprising the steps of: casting the optical lens; and inserting an optical device according to claim 11 into the cast optical lens during the casting step.

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