Lens element

Abstract

1. A method for manufacturing a lens element intended to be worn in front of a wearer's eye, the method comprising the steps of: obtaining a lens element comprising a holographic recording medium disposed on a first surface of the lens element, the holographic recording medium being configured to be capable of converting an interference pattern into a holographic optical element; obtaining wearer prescription data related to at least the wearer's prescription; manufacturing a second surface of the lens element based on the wearer's prescription data; and recording a holographic optical element in the holographic recording medium to provide an add refractive power of opposite sign to a prescribed refractive power to slow the progression of refractive error in the eye.

Description

[Technical Field]

[0001] The present invention relates to a lens element intended to be worn in front of a person's eye to arrest or reduce the progression of ocular refractive errors, such as myopia or hyperopia. The present invention further relates to a lens member comprising a first optical surface having a surface design and a second optical surface to be manufactured. [Background technology]

[0002] Myopia of the eye is characterized by the fact that the eye focuses distant objects in front of the retina, and hyperopia is characterized by the fact that the eye focuses distant objects behind the retina. Myopia is usually corrected using concave lenses that provide a negative refractive power, and hyperopia is usually corrected using convex lenses that provide a positive refractive power.

[0003] It has been found that some people, particularly children, are unable to focus accurately when viewing objects placed at close range, i.e., in near vision conditions, when corrected using conventional single vision optical lenses. Because of this impaired focusing, in myopic children whose distance vision is corrected, images of near objects are also formed posterior to the child's retina, even in the foveal region.

[0004] Such impaired focusing can affect the progression of myopia in such people. You may have noticed that for most of the above people, myopic impairment tends to worsen over time, partly due to long, intensive close-up work sessions.

[0005] In particular, studies conducted in monkeys have shown that significant defocusing of light behind the retina, occurring away from the foveal area, can cause eye elongation and thus exacerbate myopic damage.

[0006] Therefore, there appears to be a need for a lens element that will prevent or at least slow the progression of refractive errors of the eye, such as myopia or hyperopia. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] International Publication No. 2016 / 146590 Brochure [Patent Document 2] International Publication No. 2016 / 107919 Brochure [Non-patent literature]

[0008] [Non-Patent Document 1] “Refractive error, axial length, and peripheral refractive error before and after the onset of myopia” by Mutti DO1, Hayes JR, Mitchell GL, Jones LA, Moeschberger ML, Cotter SA, Kleinstein RN, Manny RE, Twelker JD, Zadnik K; CLEERE Study Group, Invest Ophthalmol Vis Sci. 2007 Jun;48(6):2510-9 [Non-patent document 2] “Peripheral refraction along the horizontal and vertical visual fields in myopia”, by Atchison DA1, Pritchard N, Schmid KL, Vision Res. 2006 Apr;46(8-9):1450-8 [Non-patent document 3] “Peripheral Refraction and Ocular Shape in Children”, by Donald O. Mutti, Robert I. Sholtz, Nina E. Friedman, and Karla Zadnik in IOVS, April 2000, Vol. 41, No. 5 Summary of the Invention [Means for solving the problem]

[0009] To this end, the present invention provides a lens element intended to be worn in front of the wearer's eye, comprising: a refractive element configured to provide a first refractive power to the wearer based on a wearer's prescription for correcting refractive error of the eye of the wearer, e.g., under standard wearing conditions and for foveal vision, the prescription including at least a prescribed refractive power adapted to the wearer; at least one holographic optical element that provides an add power of opposite sign to the prescribed power to slow the progression of the eye's refractive error; A lens element is proposed, comprising:

[0010] Advantageously, having a holographic optical element that provides an add power of the opposite sign to the prescribed power reduces the natural tendency of the eye's retina to deform, particularly to elongate, thus slowing the progression of the eye's refractive error.

[0011] Furthermore, holographic optical elements have the advantage of being unobtrusive and allow the first optical power to be measured using conventional means such as a focus distance meter.

[0012] According to further embodiments, which may be considered alone or in combination, at least one holographic optical element provides an add power of 0.25 diopters or more, e.g., 1.5 diopters or more, in absolute value, over a portion of the visible spectrum; and / or the refractive error of the wearer's eye corresponds to myopia, the add power is positive, and the holographic optical element is configured to provide the effect of a refractive converging lens on light coming from at least one object; and / or the refractive error of the wearer's eye corresponds to hyperopia, the add power is negative, and the holographic optical element is configured to provide the effect of a refractive diverging lens on light coming from at least one object; and / or At least one object is positioned at a finite distance from the holographic optical element, and / or At least one object is positioned at infinity of the holographic optical element, and / or the lens element further comprises at least two holographic optical elements, a first holographic optical element configured to provide a refractive lens effect for light coming from an object at a finite distance from the holographic optical element, and a second holographic optical element configured to provide a refractive lens effect for light coming from an object at an infinity distance from the holographic optical element; and / or at least one holographic optical element has an astigmatic power, and / or At least one holographic optical element is disposed in front of the lens element; and / or At least one holographic optical element is disposed on the rear surface of the lens element; and / or at least one holographic optical element is disposed between the front and rear surfaces of the lens element; and / or at least one holographic optical element having alternating concentric annular sections having an optical power of 0.25 diopters or greater and concentric annular sections having an optical power of 0.1 diopters or less; and / or the lens element further comprises at least two holographic optical elements having different portions of the effective visible spectrum and / or angular band; and / or at least two holographic optical elements are configured to provide the same add power; and / or at least two holographic optical elements are configured to provide different add powers; and / or At least two holographic optical elements have different positions between the front and rear surfaces of the lens element; and / or the lens element has a near vision reference point and at least one holographic optical element extends above said near vision reference point; and / or At least one holographic optical element has an efficiency of 10% or greater over the effective visible spectrum; and / or the holographic element is configured to provide additional optical power to light rays passing through said holographic element; and / or the holographic element is configured to provide additional optical power to light rays reflected by said holographic element; and / or At least one holographic optical element has alternating concentric annular sections having an optical power of 0.5 diopters or greater and concentric annular sections having an optical power of 0.1 diopters or less.

[0013] The present invention also relates to an eyewear device comprising a lens element according to the present invention and intended to be worn by a wearer.

[0014] The eyewear equipment may be a spectacle frame, a helmet, a mask, or any head-up device.

[0015] The present invention provides a first optical surface having a surface design; a second optical surface to be fabricated; and a holographic recording medium configured to convert the interference pattern into a holographic optical element; The present invention further relates to a lens member comprising:

[0016] Advantageously, such a lens member can be used to obtain a lens element according to the invention.

[0017] According to further embodiments, which may be considered alone or in combination, a holographic recording medium is disposed on the first optical surface; and / or the holographic recording medium is disposed between the first optical surface and the second optical surface; and / or the holographic recording medium is planar or has the same shape as the first optical surface, and / or the holographic recording medium extends over the geometric centre of the first optical surface; and / or the holographic recording medium has a surface area that is greater than 10% of the surface area of ​​the first optical surface; and / or The lens element further comprises a plurality of holographic recording media, each configured to be capable of converting interference patterns into holographic optical elements over a different portion of the visible spectrum.

[0018] The present invention provides a first optical surface having a surface design; a second optical surface to be fabricated; and at least one holographic optical element that provides refractive power over a portion of the visible spectrum; The present invention further relates to a lens member comprising:

[0019] Advantageously, such a lens member can be used to obtain a lens element according to the invention.

[0020] According to further embodiments, which may be considered alone or in combination, at least one holographic optical element provides an optical power of 0.25 diopters or more, for example 1.5 diopters or more; and / or at least one holographic optical element is disposed on the first optical surface; and / or at least one holographic optical element is disposed between the first and second optical surfaces; and / or at least one holographic optical element includes and extends around the geometric center of the first optical surface; and / or at least one holographic optical element has a surface area that is greater than 10% of the surface area of ​​the first optical surface; and / or The lens element further comprises at least two holographic optical elements having different portions of the effective visible spectrum and / or angular band.

[0021] The present invention relates to a method for manufacturing a lens element intended to be worn in front of a wearer's eye, comprising the steps of: obtaining a lens member comprising a holographic recording medium disposed on a first surface of the lens member, the holographic recording medium configured to convert an interference pattern into a holographic optical element; obtaining prescription data for the wearer relating to at least a prescription for the wearer; manufacturing a second surface of the lens element based on the wearer's prescription data; recording a holographic optical element in the holographic recording medium to provide an add power of opposite sign to the prescribed power to slow the progression of the refractive error of the eye; The present invention further relates to a method, including:

[0022] Advantageously, the method according to the invention allows for a simple and easy manufacturing process for lens elements comprising holographic optical elements.

[0023] According to further embodiments of the present invention, which may be considered alone or in combination, the first optical surface corresponds to the front surface of the lens element and / or the rear surface of the lens element and / or a surface included between the front and rear surfaces; and / or the step of manufacturing the second surface of the lens element is carried out before the step of recording the holographic optical element; and / or the refractive error of the wearer's eye corresponds to myopia, the add power is positive, and the holographic optical element is recorded in such a way as to provide the effect of a refractive converging lens for light coming from at least one object; and / or the refractive error of the wearer's eye corresponds to hyperopia, the add power is negative, and the holographic optical element is recorded in such a way as to provide the effect of a refractive diverging lens for light coming from at least one object; and / or At least one object is positioned at a finite distance from the holographic optical element, and / or At least one object is positioned at infinity of the holographic optical element, and / or the step of recording the holographic optical element comprises the steps of recording at least a first holographic optical element, the first holographic optical element being configured to provide a refractive lens effect for light coming from an object at a finite distance from the holographic optical element, and recording a second holographic optical element, the second holographic optical element being configured to provide a refractive lens effect for light coming from an object at infinity from the holographic optical element; and / or the step of recording the holographic optical elements comprises recording at least a first holographic optical element and recording at least a second holographic optical element, the holographic optical elements being recorded having different portions of the effective visible spectrum and / or angular band; and / or At least two holographic optical elements are recorded to provide the same add power; and / or The lens element includes a near vision reference point and at least one holographic optical element is recorded to extend over the near vision reference point.

[0024] Non-limiting embodiments of the present invention will now be described with reference to the accompanying drawings. [Brief explanation of the drawings]

[0025] [Figure 1] 1 is a schematic profile view of a lens element according to an embodiment of the present invention; [Figure 2]FIG. 2 is a plan view of a lens element according to an embodiment of the present invention. [Figure 3] 1 illustrates a holographic optical element according to an embodiment of the present invention. [Figure 4] 1 is a flow diagram of a method according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0026] Elements in the figures are illustrated for simplicity and clarity and are not necessarily drawn to scale. For example, the dimensions of some of the elements in the figures may be exaggerated relative to other elements to help to improve understanding of embodiments of the present invention.

[0027] The present invention relates to a lens element intended to be worn in front of a wearer's eye.

[0028] In the following description, terms such as "top," "bottom," "horizontal," "vertical," "upper," "lower," "front," "rear," or other terms indicating relative positions may be used, and these terms should be interpreted in the context of the mounted lens elements.

[0029] In the context of the present invention, the term "lens element" may refer to an uncut optical lens, or an eyeglass optical lens that has been shaped to fit a particular eyeglass frame, or an ophthalmic lens and an optical device adapted to be placed on the ophthalmic lens.

[0030] The lens element according to the invention is adapted to a wearer and is intended to be worn in front of the wearer's eye. Although the invention has been described in detail for the case where the refractive error is myopia, the invention also applies when the refractive error is hyperopia. Those skilled in the art can adapt the description for hyperopia.

[0031] As shown in FIG. 1, a lens element 10 according to the present invention includes: a refractive element 12; at least one holographic element 14; Equipped with.

[0032] Lens element 10 shown in FIG. 1 includes a front or "object-side" surface F1 formed as a convexly curved surface toward the object side, and a rear or "eye-side" surface F2 formed as a concave surface having a curvature different from that of object-side surface F1.

[0033] Although the front surface is depicted as convex and the rear surface as concave in FIG. 1, the present invention is not limited to such configurations.

[0034] The refractive element 12 is configured to provide the wearer with a first refractive power based on the wearer's prescription to correct the refractive error of the wearer's eye, for example, under standard wearing conditions and for foveal vision.

[0035] Wearing conditions are to be understood as the position of the lens element relative to the wearer's eye, defined, for example, by the angle of forward wear, the distance from the cornea to the lens, the pupil-corneal distance, the distance from the center of rotation (CRE) to the pupil, the distance from the CRE to the lens, and the curvature angle.

[0036] The cornea-to-lens distance is the distance between the cornea and the posterior surface of the lens along the visual axis of the eye in primary position (usually horizontal), and is equal to, for example, 12 mm.

[0037] The pupil-corneal distance is the distance between the pupil and the cornea along the visual axis of the eye and is usually equal to 2 mm.

[0038] The CRE-to-pupil distance is the distance between the center of rotation along the visual axis of the eye (CRE) and the cornea, and is equal to, for example, 11.5 mm.

[0039] The CRE to lens distance is the distance between the CRE of the eyeball and the posterior surface of the lens along the visual axis of the eye in primary position (usually horizontal), and is equal to, for example, 25.5 mm.

[0040] The forward tilt angle during wear is the angle in the vertical plane between the normal to the posterior surface of the lens and the visual axis of the eye in the primary position (usually horizontal) at the point of intersection of the latter and the latter, and is, for example, equal to 8°.

[0041] The curvature angle is the angle in the horizontal plane between the normal to the posterior surface of the lens and the visual axis of the eye in the primary position (usually horizontal) at the intersection of the latter and the latter, and is, for example, equal to 0°.

[0042] An example of a standard wearer condition may be defined by a wearer tilt angle of 8°, a cornea-to-lens distance of 12 mm, a pupil-to-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 camber angle of 0°.

[0043] The term "prescription" should be understood to mean a set of optical properties of the eye, including refractive power, astigmatism, and prismatic deflection, measured by an ophthalmologist or optometrist to correct a visual defect of the eye, for example, by means of a lens placed in front of the eye. For example, a prescription for a myopic eye includes a value of refractive power for distance vision and a value of astigmatism, including the power and axis of astigmatism.

[0044] Although the present invention is not limited to progressive lenses, the expressions used in this specification are shown in Figures 1 to 10 of Patent Document 1, which is a document related to progressive lenses. A person skilled in the art can adapt the definition of a single vision lens.

[0045] The refractive element may be configured to provide a single vision power and / or astigmatism, including an astigmatism power value and an astigmatism axis value, corresponding to the prescribed power for the wearer.

[0046] The refractive elements may have continuously varying refractive powers, for example, they may have a progressive addition design.

[0047] The optical design of the refractive elements is a fitting cross having a negative refractive power; a first zone extending toward the temporal side of the refractive element when the lens element is being worn by a wearer; In the first zone, the refractive power increases moving temporally and the refractive power on the nasal side of the lens is substantially the same as the refractive power of the fitting cross.

[0048] Such an optical design is disclosed in more detail in US Pat. No. 5,649,999.

[0049] At least one holographic optical element 14 provides an add power of opposite sign to the prescribed power to slow the progression of the eye's refractive error.

[0050] In the sense of the present invention, a "holographic optical element" changes the amplitude and / or phase and / or polarization of a light beam transmitted through or reflected by said holographic optical element.

[0051] The holographic optical element may be configured to provide an add power to light rays passing through said holographic optical element. According to such an embodiment, the holographic optical element is configured to provide an add power to light coming from the wearer's environment when the lens element is worn.

[0052] Alternatively, the holographic element is configured to provide a refractive power to light rays reflected by said holographic element. According to such an embodiment, the optical lens element is attached to a head-mounted device, e.g., a spectacle frame, comprising a light source, or more generally, an image generating device. The head-mounted device is configured such that, when the lens element is worn, light rays from the light source are reflected onto the holographic optical element towards the wearer's eyes.

[0053] Advantageously, by having a holographic optical element that provides an added refractive power of the opposite sign to the prescribed refractive power, an image is formed in front of the retina that acts as a signal to stop eye growth, inhibiting retinal deformation of the wearer's eye, particularly in peripheral vision, and making it possible to slow the progression of refractive error in the eye of the person wearing the lens element.

[0054] If the refractive error of the wearer's eye corresponds to myopia, the add power is positive and the holographic optical element is configured to provide the effect of a refractive converging lens on light coming from at least one object.

[0055] If the refractive error of the wearer's eye corresponds to hyperopia, the add power is negative and the holographic optical element is configured to provide the effect of a refractive diverging lens on light coming from at least one object.

[0056] At least one object may be located at a finite distance from the holographic optical element, or at least one object may be located at infinity from the holographic optical element.

[0057] According to a preferred embodiment of the present invention, the holographic optical element provides an add power of 0.25 diopters or more absolute, for example 0.5 diopters or more absolute, for example 1.5 diopters or more absolute, to light passing through or reflected by the holographic optical element over a portion of the visible spectrum.

[0058] The holographic optical element may have the optical function of providing an add power as well as providing an astigmatic power.

[0059] 1, the holographic optical element 14 is disposed between the front and rear surfaces of the lens element 10. The holographic optical element 14 may have a planar shape or any curved shape.

[0060] Alternatively, the holographic optical element may be placed on the front surface F1 of the lens element.

[0061] Additionally, a holographic optical element may be disposed on the rear surface F2 of the optical element.

[0062] Preferably, at least one holographic optical element has an efficiency of 10% or greater over the effective visible spectrum.

[0063] Preferably, the at least one holographic optical element is configured to have the largest possible angular band.

[0064] The holographic optical element may have alternating concentric annular sections having a refractive power of 0.25 diopters or greater and concentric annular sections having a refractive power of 0.1 diopters or less.

[0065] According to an embodiment of the present invention, the lens element has a near vision reference point and the holographic optical element extends above said near vision reference point.

[0066] The near reference point is the point on the lens element through which the wearer's line of sight passes when the wearer is gazing at an object located at approximately 40 cm in standard wearer conditions.

[0067] Advantageously, placing the holographic element in the near zone of the lens element helps slow the progression of refractive error in the eye while reducing the size of the holographic optical element. Indeed, the inventors have determined that the efficiency of holographic optical elements is greater when placed in the near zone.

[0068] The lens element may be divided into multiple zones.

[0069] For example, as shown in FIG. 2, the lens element may be divided into four quadrants Q1, Q2, Q3, Q4 at 45°.

[0070] In the sense of the present invention, "quadrant at 45°" is to be understood as quadrants with equal angles of 90° oriented at 45° / 225° and 135° / 315° according to the TABO convention, as shown in FIG. 2.

[0071] According to an embodiment of the present invention, each quadrant may comprise a holographic optical element that provides a different refractive power.

[0072] For example, the first quadrant Q1 may include a holographic element providing an add power of 0.5 diopters, the second quadrant Q2 may include a holographic element providing an add power of 1 diopter, the third quadrant Q3 may include a holographic element providing an add power of 1.5 diopters, and the fourth quadrant Q4 may include a holographic element providing an add power of 2 diopters.

[0073] Advantageously, if the optical design of the refractive elements is rotationally symmetric, such a configuration allows the addition power to be adapted by simply rotating the lens elements to position the quadrant with the desired addition power as the near zone, i.e., lower.

[0074] As shown in FIG. 2, the lens element may comprise a plurality of holographic optical elements 14a-14d.

[0075] In the example shown in FIG. 2, different holographic elements have different positions and provide different add powers.

[0076] Typically, holographic optical elements are recorded using interference patterns at a given angle of incidence and using a monochromatic light source such as a laser.

[0077] Thus, a holographic optical element has an effective visible spectrum near the wavelength of the monochromatic light source used to record the holographic element, and an angular band near the angle of incidence used to record the holographic element.

[0078] According to embodiments of the present invention, the lens element may further comprise at least two holographic optical elements having different portions of the effective visible spectrum and / or angular band.

[0079] Thus, all parts of the effective visible spectrum and / or angular band are increased.

[0080] The at least two holographic optical elements may be configured to provide the effect of a refractive lens for light coming from different objects at different distances.

[0081] For example, a first holographic optical element may be configured to provide a refractive lens effect for light coming from an object at a finite distance from the holographic optical element, and a second holographic optical element may be configured to provide a refractive lens effect for light coming from an object at infinity from the holographic optical element.

[0082] The different holographic optical elements may be configured to provide different add powers, such as the example shown in FIG.

[0083] Alternatively, the different holographic optical elements may be configured to provide the same add power.

[0084] In the sense of the present invention, two refractive powers are considered to be different if the difference between them is 0.25D or more.

[0085] The different holographic optical elements may have different positions between the front and back surfaces of the lens element, i.e. along the optical axis of the lens element, and / or on the lens element, i.e. in a plane perpendicular to the optical lens element.

[0086] The plurality of holographic optical elements may be discontinuous holographic optical elements.

[0087] In the sense of the present invention, two holographic optical elements are discontinuous if, for all paths connecting them, it is possible to measure the refractive power based on the prescription of a person's eye along at least a portion of each path.

[0088] The plurality of holographic optical elements 14 may comprise at least two holographic optical elements in series.

[0089] In the sense of the present invention, two holographic optical elements are continuous if there is a path connecting them and along part of said path it is not possible to measure the refractive power based on the prescription of a person's eye.

[0090] As shown in Figure 3, the holographic optical elements 14 may be arranged on the refractive element 12 along a set of concentric rings. The optical power and / or cylinder of the holographic optical elements may vary depending on their position along the concentric rings.

[0091] The optical function holographic optical element corresponds to a segment of concentric rings that are cylindrical only. In this example, the holographic optical element has an optical function with constant refractive power but a variable cylindrical lens axis.

[0092] The embodiment with concentric rings described with reference to Figure 3 may be combined with the embodiment of Figure 2 with multiple zones, such as four quadrants.

[0093] The lens element according to the invention may or may not be tinted. The lens element may comprise a photochromatic layer and / or a polarizing layer, preferably on the object side of the lens element.

[0094] The present invention provides a first optical surface having a surface design; a second optical surface to be fabricated; and a holographic recording medium configured to convert the interference pattern into a holographic optical element; The present invention further relates to a lens member comprising:

[0095] The holographic recording medium can be a holographic film or a holographic varnish.

[0096] According to an embodiment of the present invention, a holographic recording medium may be disposed on the first optical surface. Advantageously, the holographic recording medium is readily accessible and the second optical surface may be manufactured using standard manufacturing processes.

[0097] According to an embodiment, the holographic recording medium is arranged between the first optical surface and the second optical surface. Advantageously, the holographic recording medium is protected.

[0098] According to such an embodiment, the holographic recording medium may be planar and may have the same shape as the first optical surface.

[0099] Preferably, the holographic recording medium extends above the geometric center of the first optical surface. In the sense of the present invention, a holographic recording medium is considered to extend above the geometric center of the first optical surface if a line that is perpendicular to the first optical surface and passes through said geometric center passes through the holographic medium.

[0100] According to an embodiment of the present invention, the holographic recording medium has a surface area that is greater than 10% of the surface area of ​​the first optical surface.

[0101] The lens element may comprise a plurality of holographic recording media, each configured to convert interference patterns into holographic optical elements over a different portion of the visible spectrum.

[0102] The present invention provides a method for manufacturing a lens element according to the present invention, comprising the steps of: providing a lens member; a holographic recording step; Lens manufacturing steps The present invention further relates to a method, including:

[0103] In the lens member providing step, a lens member according to the present invention having a holographic recording medium is provided.

[0104] The lens element may be selected based on the surface design of the first optical surface.

[0105] In the holographic recording step, a holographic optical element is recorded in the holographic recording medium to provide an optical function having an add power of 0.25 diopters or more, such as 1.5 diopters or more.

[0106] In a manufacturing step, the second surface of the lens member is manufactured based on the wearer's prescription to obtain a lens element.

[0107] The holographic recording step and the lens fabrication step may be interchanged, in other words the lens fabrication step may be performed before the holographic recording step.

[0108] The holograms can be recorded in a holographic layer and added to the lens element using the same type of process as for adding a polarizing layer.

[0109] The present invention also relates to a method of manufacturing a lens element intended to be worn in front of a wearer's eye.

[0110] A method of manufacturing a lens element includes obtaining a lens member with a holographic recording medium disposed on a first surface of the lens member.

[0111] According to different embodiments of the invention, the first optical surface may correspond to the front surface of the lens element and / or the rear surface of the lens element and / or a surface included between the front and rear surfaces.

[0112] In the sense of the present invention, the posterior surface of the lens refers to the surface of the lens that faces the wearer's eye when the lens is worn. The anterior surface corresponds to the surface facing away from the posterior surface and therefore facing the wearer's environment.

[0113] The holographic recording medium is configured to be able to convert the interference pattern into a holographic optical element, in other words, the holographic recording medium does not provide any additional optical power to the lens element before being recorded.

[0114] The holographic recording medium can be a holographic film or a holographic varnish.

[0115] The lens element may include a near vision reference point.

[0116] The method of manufacturing a lens element further comprises obtaining wearer prescription data, the wearer data relating to at least the wearer's prescription.

[0117] The method of manufacturing a lens element may further comprise obtaining wearing condition data, which may relate to wearing conditions measured on a wearer or customized based on, for example, morphological or postural data related to the wearer.

[0118] The method for manufacturing the lens element may further comprise the step of acquiring retinal data of the wearer. The retinal data of the wearer relates to the shape of the wearer's retina at least in the same reference frame in which the wearing conditions are provided. The retinal data of the wearer may correspond to a standard retinal shape, or to a retinal shape measured on the wearer or customized based on, for example, the wearer's morphology or prescription. The retinal data may also be expressed in relation to the refractive power recorded in the holographic optical element.

[0119] The method of manufacturing the lens element further includes manufacturing a second surface of the lens member based at least on the wearer's prescription data.

[0120] According to an embodiment of the present invention, the second surface of the lens element is further manufactured based on the fitting data.

[0121] The method for manufacturing the lens element further includes recording a holographic optical element in a holographic recording medium.

[0122] The holographic optical element is recorded to provide an add power of opposite sign to the prescribed power to slow the progression of the eye's refractive error.

[0123] If the refractive error of the wearer's eye corresponds to myopia, the add power is positive and the holographic optical element is recorded to provide the effect of a refractive converging lens on light coming from at least one object.

[0124] Alternatively, if the refractive error of the wearer's eye corresponds to hyperopia, the add power is negative and the holographic optical element is recorded to provide the effect of a refractive diverging lens on light coming from at least one object.

[0125] At least one object may be located at a finite distance from the recorded holographic optical element, or at least one object may be located at infinity from the recorded holographic optical element.

[0126] Preferably, the step of manufacturing the second surface of the lens member is carried out before the step of recording the holographic optical element.

[0127] Advantageously, recording the holographic optical element after manufacturing the second surface of the optical lens facilitates manufacturing of the lens. Indeed, once the second surface of the lens element is manufactured and the optical function of the lens is defined, it becomes easier to record the holographic optical element to focus light in front of / behind the user's retina in order to slow the refractive error of the wearer's eye.

[0128] According to another embodiment of the present invention, recording a holographic optical element may include recording at least a first holographic optical element and a second holographic optical element.

[0129] The first holographic optical element may be configured to provide the effect of a refractive lens for light coming from an object at a finite distance from the holographic optical element.

[0130] The second holographic optical element may be configured to provide the effect of a refractive lens for light coming from an object at infinity of the holographic optical element.

[0131] The first and second holographic optical elements may be recorded to have different portions of the effective visible spectrum and / or angular band.

[0132] The first and second holographic optical elements may be recorded to provide the same add power, or the first and second holographic optical elements may be configured to provide different add powers.

[0133] At least one holographic optical element may be recorded to extend above the near point of the lens element.

[0134] The present invention also provides a first optical surface having a surface design; a second optical surface to be fabricated; and at least one holographic optical element that provides refractive power over a portion of the visible spectrum; The present invention further relates to a lens member comprising:

[0135] Advantageously, such lens members can be used to manufacture lens elements that are fitted to a wearer to slow the progression of refractive errors such as myopia.

[0136] Preferably, at least one holographic optical element provides a refractive power of 0.25 diopters or more, such as 1.5 diopters or more.

[0137] The holographic optical element may be located at the first optical surface or between the first and second optical surfaces.

[0138] According to an embodiment of the present invention, at least one holographic optical element includes and extends around the geometric center of the first optical surface.

[0139] Preferably, at least one holographic optical element has a surface area that is greater than 10% of the surface area of ​​the first optical surface.

[0140] A lens element according to the present invention may comprise at least two holographic optical elements having different parts of the effective visible spectrum and / or angular band.

[0141] The present invention also relates to a method for determining a lens element adapted to slow the progression of refractive error in a wearer's eye.

[0142] As shown in FIG. 4, the method of the present invention includes at least: A step S1 of providing prescription data of a wearer; a step S2 of providing wearing condition data; A step S3 of providing retinal data of the wearer; A lens element determination step S4; Includes.

[0143] In a wearer's prescription data providing step S1, wearer's prescription data related to the wearer's prescription is provided.

[0144] In the wearer condition data providing step S2, wearing condition data relating to the wearing conditions of the lens element by the wearer is provided.

[0145] According to an embodiment of the present invention, the mounting condition data provided in the mounting condition data providing step corresponds to standard mounting conditions.

[0146] Alternatively, the wearing condition data provided in the wearing condition data providing step corresponds to wearing conditions measured on the wearer or customized based on, for example, morphological data or posture data related to the wearer.

[0147] In a wearer's retinal data providing step S3, retinal data relating to the shape of the wearer's retina in the same reference frame as the wearing conditions are provided is provided.

[0148] According to an embodiment of the present invention, the wearer's retinal data provided in the wearer's retinal data providing step corresponds to a standard retinal shape.

[0149] Examples of standard retinal shapes are disclosed in Non-Patent Document 1.

[0150] Further examples of standard retinal shapes are disclosed in Non-Patent Document 2.

[0151] Further examples of standard retinal shapes are disclosed in Non-Patent Document 3.

[0152] Alternatively, the wearer's retinal data provided in the wearer's retinal data providing step may correspond to a retinal shape measured on the wearer or customized based on, for example, the wearer's morphology or prescription. The retinal data may also be expressed in terms of refractive power recorded in the holographic optical element.

[0153] In a lens element determination step S4, a lens element is determined that comprises a refractive element and at least one holographic optical element.

[0154] The lens elements are determined such that the refractive elements provide a first refractive power based on the wearer's prescription for a wearing condition and foveal vision corresponding to the wearing data.

[0155] Additionally, at least one holographic optical element is determined to provide an add power of opposite sign to the prescribed power.

[0156] If the refractive error of the wearer's eye corresponds to myopia, the add power is positive and the holographic optical element is configured to provide the effect of a refractive converging lens on light coming from at least one object.

[0157] If the refractive error of the wearer's eye corresponds to hyperopia, the add power is negative and the holographic optical element is configured to provide the effect of a refractive diverging lens on light coming from at least one object.

[0158] At least one object may be positioned at a finite distance from the holographic optical element, or at least one object may be positioned at infinity from the holographic optical element.

[0159] According to an embodiment of the present invention, in the lens element determining step, a plurality of holographic optical elements having different portions of the effective visible spectrum and / or angular band are determined.

[0160] As shown in FIG. 4, the method of the present invention may further include a front surface data providing step S40.

[0161] In a front surface data provide step S40, front surface data representing the front or first surface of the lens element is provided.

[0162] According to such an embodiment, in the lens element determination step, the shape of the posterior or second surface and the holographic optical element to be placed on the anterior surface are determined so that the refractive element provides a first refractive power based on the wearer's prescription for the wearing conditions and foveal vision corresponding to the wearing data, and at least one holographic optical element provides an add refractive power of the opposite sign to the prescribed refractive power.

[0163] According to a preferred embodiment, in the lens element determination step, the shape of the posterior surface is determined such that the refractive element provides a first refractive power based on the wearer's prescription for the wearing conditions and foveal vision corresponding to the wearing data.

[0164] The add power of the holographic optical element is determined to focus light rays at a given distance from the retina of the eye, particularly for peripheral vision.

[0165] The invention has been described above with the help of embodiments without limiting the general inventive concept.

[0166] 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.

[0167] 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 advantageously used. Any reference signs in the claims should not be interpreted as limiting the scope of the invention.

[0168] In the sense of the present invention, the term "obtaining" encompasses the terms "receiving" and "retrieving". [Explanation of symbols]

[0169] 10 Lens Elements 12 Refraction Elements 14 Holographic Elements

Claims

1. 1. A method of manufacturing a lens element intended to be worn in front of a wearer's eye, comprising: obtaining a lens element comprising a holographic recording medium disposed on a first optical surface of the lens element, the holographic recording medium being configured to be capable of converting an interference pattern into a holographic optical element; obtaining wearer prescription data associated with at least said wearer's prescription; acquiring retinal data relating to at least the shape of the wearer's retina; manufacturing a second optical surface of the lens element based on prescription data of the wearer; recording a holographic optical element in the holographic recording medium to provide an add power of opposite sign to a prescribed power that focuses light rays at a given distance from the retina of the wearer's eye to slow the progression of refractive error in the eye; Including, 10. The method of claim 9, wherein the step of fabricating the second optical surface of the lens element is performed before the step of recording the holographic optical element.

2. The method of claim 1 , wherein a first optical surface corresponds to a front surface of the lens element, and / or a rear surface of the lens element, and / or an optical surface included between the front and rear surfaces.

3. 3. The method of claim 1, wherein the refractive error of the eye of the wearer corresponds to myopia, the add power is positive, and the holographic optical element is recorded in such a way as to provide the effect of a refractive converging lens on light coming from at least one object.

4. 3. The method of claim 1, wherein the refractive error of the eye of the wearer corresponds to hyperopia, the add power is negative, and the holographic optical element is recorded in such a way as to provide the effect of a refractive diverging lens for light coming from at least one object.

5. 5. The method of claim 3, wherein the at least one object is positioned at a finite distance from the holographic optical element.

6. 5. The method of claim 3 or 4, wherein the at least one object is positioned at infinity of the holographic optical element.

7. 7. The method of claim 1, wherein the step of recording a holographic optical element comprises the steps of: recording at least a first holographic optical element, the first holographic optical element configured to provide a refractive lens effect for light coming from an object at a finite distance from the holographic optical element; and recording a second holographic optical element, the second holographic optical element configured to provide a refractive lens effect for light coming from an object at infinity from the holographic optical element.

8. 8. The method of claim 1, wherein the step of recording holographic optical elements comprises recording at least a first holographic optical element and recording at least a second holographic optical element, the holographic optical elements being recorded to have different parts of the effective visible spectrum and / or angular band.

9. A method according to any one of claims 1 to 8, wherein at least two holographic optical elements are recorded to provide the same add power.

10. A method according to any one of the preceding claims, wherein the lens element comprises a near vision reference point and at least one holographic optical element is recorded so as to extend over the near vision reference point.

11. 1. A lens element intended to be worn in front of a wearer's eye, said lens element comprising: a refractive element configured to provide the wearer with a first refractive power based on the wearer's prescription for correcting anomalous refraction of the wearer's eye for standard wearer conditions and foveal vision; a plurality of discontinuous holographic optical elements providing an addition power of opposite sign to said first power so as to retard the progression of anomalous refraction of said eye; Equipped with The discrete holographic optical elements are arranged along a set of concentric rings on the refractive element.

12. 12. The lens element of claim 11, wherein the optical power of the discrete holographic optical elements varies with position along the concentric rings.

13. 12. The lens element of claim 11, wherein the cylindrical power of the discrete holographic optical elements varies with position along the concentric rings.

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