Optical lens intended to be worn by wearer

Abstract

An optical lens intended to be worn by a wearer comprises: a refractive region having a refractive power based on a prescription of an eye of the wearer; a plurality of optical elements having a transparent optical function that does not focus an image on the retina of the wearer's eye when the optical lens is worn under standard wearing conditions; a region of interest comprising a subset of optical elements, each optical element of the subset carrying a lenticular component on a surface thereof, where the region of interest has at least 50 mm2, and a standard deviation of the orientation of the lenticular axial position of each optical element included in the region of interest is less than or equal to 15 degrees with respect to a common predefined direction.

Description

Technical Field

[0001] The present disclosure relates to an optical lens intended to be worn by a wearer, the optical lens comprising a refractive zone having a refractive power based on a prescription of the wearer's eye and a plurality of optical elements having a transparent optical function that does not focus an image on the retina of the wearer's eye when the optical lens is worn under standard wearing conditions. Background Art

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

[0003] Myopia (also known as nearsightedness) has become a major public health problem worldwide. Accordingly, great efforts have been made to develop solutions aimed at slowing the progression of myopia.

[0004] Most of the current management strategies for myopia progression involve using optical defocus to act on peripheral vision. This approach has gained significant interest since studies in chicks and primates have shown that foveal refractive error can be manipulated by peripheral optical defocus without involving the intact fovea. Several methods and products are used to slow myopia progression by introducing this peripheral optical defocus. Among these solutions, orthokeratology contact lenses, bifocal soft and progressive contact lenses, circular progressive ophthalmic spectacles, and lenses with arrays of lenslets have been shown to be more or less effective through randomized controlled trials.

[0005] Myopia control solutions with lenslet arrays have been proposed, in particular by the applicant. The purpose of such lenslet arrays is to provide an optically blurred image in front of the retina, thereby triggering a stop signal to eye growth while achieving good vision.

[0006] While most prior art research has focused on the effects of lenslet size, density or optical power, the inventors have observed that lenslets can have a cylinder and that this cylinder has an effect on the quality of the wearer's vision and / or improves myopia mitigation.

[0007] Therefore, there is a need to provide optical lenses comprising optical elements having a transparent optical function that does not focus an image on the wearer's retina, wherein the cylinder of the optical element is controlled. Summary of the invention

[0008] To this end, the present disclosure proposes an optical lens intended to be worn by a wearer (e.g., in front of the wearer's eye), the optical lens comprising:

[0009] - a refractive zone having a refractive power based on the prescription of the wearer's eyes;

[0010] - a plurality of optical elements having a transparent optical function of not focusing an image on the retina of the wearer's eye when the optical lens is worn under standard wearing conditions,

[0011] a region of interest comprising a subset of optical elements, each optical element in the subset carrying a lenticular element on its surface,

[0012] The area of ​​interest has at least 50 mm 2 , for example at least 75 mm 2 ,and

[0013] A standard deviation of the orientation of the cylindrical axis of each optical element comprised in the region of interest is smaller than or equal to 15° relative to the common predefined direction, such as smaller than or equal to 10° relative to the common predefined direction.

[0014] Advantageously, having a controlled cylindrical orientation is beneficial to the wearer, particularly as it improves the quality of vision and / or the myopia mitigation function of the optical element.

[0015] In fact, controlling the cylindrical orientation makes it possible to compensate the astigmatism generated by the lenslets in the peripheral vision.Thus, the optical lens according to the present disclosure has an improved quality of precise defocusing, in particular the quality of the light spot generated by the lenslets in front of the retina.

[0016] According to further embodiments which may be considered alone or in combination:

[0017] - the zone of interest comprises at least 10 optical elements, such as at least 20 optical elements, such as at least 200 optical elements, such as at least 700 optical elements, having a transparent optical function that does not focus an image on the retina of the wearer's eye when the lens element is worn under standard wearing conditions; and / or

[0018] - at least 50%, such as at least 80%, such as all of the optical elements have an optical function of focusing an image outside the retina of a human eye when the optical lens is worn under standard wearing conditions (e.g. when considering the Atchison eye model); and / or

[0019] - at least 50%, for example at least 80%, for example all optical elements, have a cylindrical power having an absolute value greater than or equal to 0.1 D, for example greater than or equal to 0.2 D; and / or

[0020] - at least a portion of one of the front surface and the back surface of the optical lens comprises at least one layer of at least one coating element covering at least a portion of the surface on which the optical element is placed; and / or

[0021] At least 50%, for example at least 80%, for example all of the optical elements are located on one of the surfaces of the optical lens, for example the front surface of the optical lens.

[0022] - at least 50%, for example at least 80%, for example all of the optical elements are located between the front surface and the back surface of the optical lens; and / or

[0023] - at least 50%, such as at least 80%, such as all of the optical elements are refractive lenslets; and / or

[0024] - the region of interest extends radially from the optical centre of the optical lens; and / or

[0025] - at least 50%, such as at least 80%, such as all of the optical elements are positioned along at least 5 concentric rings, and wherein the region of interest extends radially over the at least 5 concentric rings; and / or

[0026] - at least 50%, for example at least 80%, for example all of the optical elements are positioned on a structured mesh, which is a square mesh or a honeycomb mesh or a triangular mesh or an octagonal mesh; and / or

[0027] - The optical area of ​​interest includes the optical center of the optical lens and has a diameter of at least 150 mm 2 , for example at least 500 mm 2 ; and / or

[0028] - the optical area of ​​interest is a circular area centered on the optical center of the optical lens; and / or

[0029] - the optical area of ​​interest is a circular area centered on the optical center of the optical lens, the radius of which is greater than or equal to 15 mm, such as greater than or equal to 20 mm, such as greater than or equal to 25 mm; and / or

[0030] - The optical area of ​​interest has a minimum of 700 mm 2 , for example at least 1250mm 2 , for example at least 1900mm 2 ; and / or

[0031] - a standard deviation of the orientation of the cylindrical axes of at least 50%, for example at least 90%, for example all optical elements of the optical lens is less than or equal to 20° relative to a common predefined direction, for example less than or equal to 15° relative to a common predefined direction, for example less than or equal to 10° relative to a common predefined direction, for example less than or equal to 5° relative to a common predefined direction, for example less than or equal to 2° relative to a common predefined direction; and / or

[0032] - at least 20%, such as at least 40%, such as at least 70%, such as all optical elements have a misorientation of the cylindrical axis position less than or equal to 5°, such as less than or equal to 2° relative to a common predefined direction; and / or

[0033] - the optical lens comprises a central zone corresponding to a zone centered on the optical center of the optical lens and not comprising any optical element; and / or

[0034] - the optical lens comprises a clear area, centered at the optical center of the lens element and having a diameter greater than or equal to 7 mm (e.g. greater than or equal to 8 mm) and less than or equal to 15 mm (e.g. less than or equal to 12 mm), the clear area not comprising any optical element; and / or

[0035] - forming the refractive area as an area different from the area formed as a plurality of optical elements; and / or

[0036] - The area of ​​each optical element is greater than or equal to 0.4mm 2 And less than or equal to 5mm 2 , for example, less than or equal to 4 mm 2 ; and / or

[0037] - the ratio of the total area of ​​the optical elements to the total area of ​​the surface of the optical lens is greater than or equal to 20% (for example greater than or equal to 30%) and less than or equal to 80% (for example less than or equal to 70%); and / or

[0038] - at least 50%, for example 80%, for example all of the optical elements are multifocal lenslets; and / or

[0039] - at least 50%, for example 80%, for example all of the optical elements are diffractive lenslets; and / or

[0040] - the diffractive lenslets are adjacent diffractive lenslets; and / or

[0041] - at least 50%, such as at least 80%, such as all of the optical elements are diffusing lenslets; and / or

[0042] - at least 50%, such as at least 80%, such as all of the optical elements are located on the rear surface of the optical lens; and / or

[0043] - for each circular zone having a radius comprised between 2 mm and 4 mm, including a geometric centre located at a distance greater than or equal to said radius + 5 mm from a reference system facing the pupil of a user looking straight ahead under standard wearing conditions, the ratio between the sum of the areas of the parts of the optical element located within said circular zone and the area of ​​said circular zone is greater than or equal to 20% (e.g. greater than or equal to 30%, for example greater than or equal to 40%) and less than or equal to 80% (e.g. less than or equal to 70%, for example less than or equal to 60%); and / or

[0044] - for each circular zone having a radius comprised between 2 mm and 4 mm and including a geometric centre located at a distance equal to said radius + 5 mm from a reference system facing the pupil of a user looking straight ahead under standard wearing conditions, the ratio between the sum of the areas of the parts of the optical element located within said circular zone and the area of ​​said circular zone is greater than or equal to 20% (e.g. greater than or equal to 30%, for example greater than or equal to 40%) and less than or equal to 80% (e.g. less than or equal to 70%, for example less than or equal to 60%); and / or

[0045] - the lens element further comprises at least four optical elements, which are organized into at least two groups of adjacent optical elements; and / or

[0046] - organizing each group of adjacent optical elements into at least two concentric rings having the same center, the concentric rings of each group of adjacent optical elements being defined by an inner diameter corresponding to the smallest circle tangent to at least one optical element in the group and an outer diameter corresponding to the largest circle tangent to at least one optical element in the group; and / or

[0047] - at least some, for example all, of the concentric rings of optical elements are centred on the optical centre of the surface of the lens element on which said optical element is arranged; and / or

[0048] - the diameter of the concentric rings of the optical element is greater than or equal to 9.0 mm and less than or equal to 60 mm; and / or

[0049] - a distance between two consecutive concentric rings of the optical element greater than or equal to 0.5 mm, for example greater than or equal to 2 mm, the distance between two consecutive concentric rings being defined by the difference between the outer diameter of a first concentric ring and the inner diameter of a second concentric ring, the second concentric ring being closer to the periphery of the lens element; and / or

[0050] - at least 60%, such as at least 75%, such as at least 90%, such as all of the optical elements have their cylindrical axes oriented radially; and / or

[0051] - at least 60%, for example at least 75%, for example at least 90%, for example all of the optical elements have an orientation of the respective cylindrical axes which deviates by less than or equal to 5°, for example less than or equal to 2°, from the local radial direction relative to the optical centre of the optical lens; and / or

[0052] - at least 60%, such as at least 75%, such as at least 90%, such as all of the optical elements have their cylindrical axes oriented orthogonally to the radial direction; and / or

[0053] - at least 0%, for example at least 75%, for example at least 90%, for example all of the optical elements, have an orientation of the respective cylindrical axes which deviates by less than or equal to 5°, for example less than or equal to 2°, from a local direction orthogonal to the radial direction relative to the optical centre of the optical lens; and / or

[0054] - the optical element further comprises an optical element positioned radially between two concentric rings; and / or

[0055] - the mesh structure is a random mesh, such as a Voronoid mesh; and / or

[0056] - at least some, for example all, of the optical elements have a constant optical power and a discontinuous first derivative between two adjacent optical elements; and / or

[0057] - at least some, for example all, of the optical elements have a varying optical power and a continuous first derivative between two adjacent optical elements; and / or

[0058] - the optical element is configured such that along at least one segment of the lens element, for example along at least ten evenly distributed segments (for example one or more segments passing through the optical center of the lens element), the average spherical mirror of the optical element increases from a point of the segment (for example the optical center) towards a peripheral part of the segment; and / or

[0059] - the optical element is configured such that along at least one segment of the lens, for example along at least ten evenly distributed segments, the cylindrical power of the optical element increases from a point of said one or more segments (for example the optical center) towards a peripheral portion of said segment; and / or

[0060] - the optical element is configured such that along at least one segment of the lens, for example along at least ten evenly distributed segments, the average sphere and / or cylinder of the optical element increases from the center of said segment towards the peripheral portion of said segment; and / or

[0061] - the refractive zone comprises an optical centre, and the optical element is configured such that along at least one, e.g. at least 50%, e.g. any segment, through the optical centre of the lens, the average spherical and / or cylindrical power of the optical element increases from the optical centre towards a peripheral portion of the lens; and / or

[0062] - the refractive zone includes a distance reference point, a near reference point, and a meridian connecting the distance reference point and the near reference point, and the optical element is configured so that along any horizontal segment of the lens under standard wearing conditions, the average sphere and / or cylinder of the optical element increases from the intersection of the horizontal segment with the meridian towards the peripheral portion of the lens; and / or

[0063] - the average spherical and / or cylindrical power increase function along a segment is different depending on the position of said segment along the meridian; and / or

[0064] - the average spherical and / or cylindrical power increase function along the segment is asymmetric; and / or

[0065] - configuring the optical element such that, in standard wearing conditions, at least one segment is a horizontal segment; and / or

[0066] - the average spherical and / or cylindrical power of the optical element increases from a first point of the segment towards a peripheral portion of the segment and decreases from a second point of the segment towards the peripheral portion of the segment, the second point being closer to the peripheral portion of the segment than the first point; and / or

[0067] - the average spherical and / or cylindrical power increase function along the at least one section is a Gaussian function; and / or

[0068] - the average spherical and / or cylindrical power increase function along the at least one section is a quadratic function; and / or

[0069] - configuring the optical elements so that the average focus of light rays passing through each optical element is at the same distance from the retina; and / or

[0070] - forming the refractive area as an area different from the area formed as a plurality of optical elements; and / or

[0071] - at least one, for example all, of the optical elements are toric refractive lenslets; and / or

[0072] - the optical lens is an edged or unedged spectacle lens; and / or BRIEF DESCRIPTION OF THE DRAWINGS

[0074] Non-limiting embodiments of the present disclosure will now be described with reference to the accompanying drawings, in which:

[0075] Figure 1 shows a front view of a lens element according to a first embodiment of the present disclosure;

[0076] Figure 2 shows a profile diagram of a lens element according to an embodiment of the present disclosure;

[0077] Figure 3 shows a front view of a lens element according to a second embodiment of the present disclosure;

[0078] Figure 4 The astigmatism axis γ of the lens in the TABO convention is shown;

[0079] Figure 5 The cylindrical axis γAX is shown in the convention used to characterize aspheric surfaces.

[0080] The elements in the figures are shown for simplicity and clarity and are not necessarily drawn to scale. For example, the size of some elements in the figures may be enlarged relative to other elements to help improve the understanding of the embodiments of the present disclosure. DETAILED DESCRIPTION

[0081] The present disclosure relates to a lens element intended to be worn by a wearer.

[0082] In the rest of this specification, terms such as "upper", "bottom", "horizontal", "vertical", "above", "below", "front", "back", etc., or other words indicating relative positions may be used. These terms are understood in the wearing condition of the lens element.

[0083] In the context of the present disclosure, the term "optical lens" may refer to an uncut optical lens or an eyeglass optical lens or an ophthalmic lens that is edged to fit a specific eyeglass frame and an optical device suitable for positioning on an ophthalmic lens. In the context of the present disclosure, an "optical lens" may have a coating, such as a hard coating.

[0084] like Figures 1 to 3 As shown, an optical lens 10 according to the present disclosure includes a refractive zone 12 and a plurality of optical elements 14 .

[0085] like Figure 2 As shown, the optical lens includes at least a first surface and a second surface opposite to the second surface. For example, the first surface may include an object-side surface F1 formed as a convex surface toward the object side, and the second surface may include an eye-side surface F2 formed as a concave surface having a curvature different from the curvature of the object-side surface. The lens element 10 may be made of an organic material, a thermosetting or thermoplastic material (e.g., polycarbonate), or a mineral material such as glass.

[0086] like Figures 1 to 3 As illustrated, lens element 10 includes a refractive zone 12 .

[0087] The refractive zone 12 has a refractive power Px based on a prescription of the wearer's eye (eg, a prescription for a person for whom the optical lens is intended). The prescription is, for example, suitable for correcting abnormal refraction of the eye of the wearer of the optical lens.

[0088] The term "prescription" is understood to mean a set of optical characteristics of power, astigmatism, prismatic deviation, which are determined by an ophthalmologist or optometrist in order to correct the visual defects of the eye, for example with the aid of a lens positioned in front of the eye of the wearer. For example, a prescription for myopia comprises a power value and an astigmatism value with an axis for far vision.

[0089] The prescription may include an indication that the wearer's eye has no defects and will not provide optical power to the wearer. In this case, the refractive zone is configured to not provide any optical power.

[0090] The refraction area is preferably formed as an area other than the area formed by the plurality of optical elements. In other words, the refraction area is an area complementary to the area formed by the plurality of optical elements.

[0091] like Figure 1 and Figure 3 As shown, the refractive zone 12 may include at least a central area of ​​the optical lens 10 .

[0092] The central region may have a characteristic dimension greater than 4 mm and less than 22 mm, for example less than 20 mm.

[0093] For example, the central zone is centered at the optical center of the lens element and has a diameter greater than or equal to 7 mm (eg, greater than or equal to 8 mm) and less than or equal to 15 mm (eg, less than or equal to 12 mm).

[0094] The central area may be centered about a reference point of the optical lens 10. The reference point (about which the central area may be centered) is the geometric center of the optical lens and / or one of an optical and / or near vision reference point and / or a far vision reference point.

[0095] Preferably, the central region is centered on or at least includes a frame reference point that faces the wearer's pupil when looking straight ahead under standard wearing conditions.

[0096] like Figure 1 and Figure 3 As shown, the central region may be free of optical elements.

[0097] The wearing condition is understood as the position of the optical lens relative to the wearer's eye, as defined by the anteversion angle, cornea-to-lens distance, pupil-to-cornea distance, center of rotation of the eye (CRE)-to-pupil distance, CRE-to-lens distance, and wrap angle.

[0098] The cornea-to-lens distance is the distance between the cornea and the posterior surface of the lens along the visual axis (usually considered to be horizontal) of the eye in primary position; for example, equal to 12 mm.

[0099] The pupil-to-corneal distance is the distance between the pupil and the cornea of ​​the eye along its visual axis; it is usually equal to 2 mm.

[0100] The CRE-to-pupillary distance is the distance along the visual axis of the eye between its center of rotation (CRE) and the cornea, for example equal to 11.5 mm.

[0101] The CRE-to-lens distance is the distance between the CRE of the eye and the posterior surface of the lens along the visual axis of the eye in the first eye position (usually considered to be horizontal), for example equal to 25.5 mm.

[0102] The anteversion angle is the angle in the vertical plane between the normal to the back surface of the lens and the visual axis of the eye in the first eye position (usually considered to be horizontal) at the intersection between the back surface of the lens and the visual axis of the eye in the first eye position; for example, equal to -8°, preferably equal to 0°.

[0103] The wrap angle is the angle in the horizontal plane between the normal to the back surface of the lens and the visual axis of the eye in the first eye position (usually considered to be horizontal) at the intersection between the back surface of the lens and the visual axis of the eye in the first eye position, for example equal to 0°.

[0104] An example of a standard wearing condition may be defined by an anteversion 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 wrap angle of 0°.

[0105] Another example of a standard wearing condition that is more suitable for younger wearers may be defined by an anteversion angle of 0°, 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 wrap angle of 0°.

[0106] The central zone may include the optical center of the optical lens and have a characteristic size greater than 4 mm (corresponding to a peripheral angle of + / -8° on the retinal side) and less than 22 mm (corresponding to a peripheral angle of + / -44° on the retinal side), for example less than 20 mm (corresponding to a peripheral angle of + / -40° on the retinal side). The characteristic size may be a diameter or a major axis or minor axis of the elliptical central zone.

[0107] The refractive zone 12 may further comprise at least a second refractive power Pp different from the prescribed refractive power Px. In the sense of the present disclosure, two refractive powers are considered to be different when the difference between them is greater than or equal to 0.25D, for example greater than 0.5D.

[0108] When the prescription refractive power Px is determined to compensate for myopia of the wearer's eye, the second refractive power Pp may be greater than the refractive power Px.

[0109] When the prescription refractive power Px is determined to compensate for the presbyopia of the wearer's eye, the second refractive power Pp may be smaller than the refractive power Px.

[0110] The refractive zone 12 may include a continuous variation in refractive power. For example, the refractive zone may have a progressive multifocal design. The optical design of the refractive zone may include a fitting cross at which the optical power is negative and a first zone extending on the temporal side of the refractive power when the wearer wears the lens element. In the first zone, the optical power increases when moving toward the temporal side, and on the nasal side of the lens, the optical power of the ophthalmic lens is substantially the same as at the fitting cross. Such an optical design is disclosed in more detail in WO 2016 / 107919.

[0111] Alternatively, the refractive power in the refractive zone 12 may include at least one discontinuity.

[0112] like Figures 1 to 3 As shown, the optical lens 10 includes a plurality of optical elements 14 and a region of interest 20 including the plurality of optical elements 14 .

[0113] At least 50%, for example at least 80%, for example all of the surface of the optical element 10 may be covered by at least one layer of a coating element. The at least one coating element may include features selected from the group consisting of anti-scratch, anti-reflection, anti-fouling, anti-dust, UV30 filtering, blue light filtering, anti-abrasion features.

[0114] Any known technique may be used to provide the layers of the coating element. For example, the layers of the coating may be provided using a dip coating process in which the optical lens receives a layer of the coating on each surface simultaneously.

[0115] The optical element has a transparent optical function that does not focus an image on the retina of the wearer's eye when the optical lens is worn under standard wearing conditions.

[0116] In other words, when the wearer wears the lens element, for example, under standard wearing conditions, light passing through the plurality of optical elements will not be focused on the retina of the wearer's eye. For example, the optical elements may be focused in front of and / or behind the retina of the wearer's eye.

[0117] Advantageously, not focusing the image on the wearer's retina allows for the generation of a control signal that inhibits, reduces or at least slows the progression of a refractive error, such as myopia or hyperopia, in the eye of a person wearing the lens element.

[0118] In the sense of the present disclosure, an optical element is considered to have a transparent optical function when it absorbs less than 50%, such as less than 80%, such as less than 95% of light over the visible spectrum (ie 380 nm to 750 nm).

[0119] Each optical element 14 within the region of interest 20 carries a lenticular component on its surface.

[0120] The area of ​​interest has a minimum of 50 mm 2 , for example at least 75 mm 2 , and a standard deviation of the orientation of the cylindrical axis of each optical element included in the region of interest is less than or equal to 15° relative to the common predefined direction, for example less than or equal to 10° relative to the common predefined direction.

[0121] According to an embodiment, the optical region of interest includes the optical center of the optical lens and has a radius of at least 150 mm. 2 , for example at least 500mm 2 The optical area of ​​interest may be a circular area centered on the optical center of the optical lens.

[0122] For example, the optical area of ​​interest is a circular area centered at the optical center of the optical lens, and the radius of the circular area is greater than or equal to 15 mm, such as greater than or equal to 20 mm, such as greater than or equal to 25 mm. The optical area of ​​interest may have a radius of at least 700 mm. 2 , for example at least 1250mm 2 , for example at least 1900mm 2 .

[0123] Advantageously, each optical element having a controlled cylindrical orientation improves the quality of vision and the quality of the myopia or hyperopia mitigation function of the optical lens.

[0124] like Figure 1 and Figure 3 As shown, the region of interest includes at least 10 optical elements, such as at least 20 optical elements, such as at least 20 optical elements, such as at least 200 optical elements, such as at least 700 optical elements, having a transparent optical function that does not focus an image on the retina of the wearer's eye when the lens element is worn under standard wearing conditions.

[0125] According to an embodiment, at least 50%, preferably more than 80%, more preferably all optical elements 14 may be configured to focus somewhere other than the wearer's retina, for example, under standard wearing conditions. In other words, a plurality of optical elements may be configured to focus in front of and / or behind the retina of the wearer's eye. The optical function of the optical elements may be defined under standard wearing conditions and taking into account a common eye model, such as the Atchison eye model.

[0126] At least 50%, preferably more than 80%, for example, all of the optical elements 14 are configured to form a caustic surface in front of the retina of the human eye. In other words, the optical element is configured so that each segment plane (if any) where the light flux is concentrated is located in front of the retina of the human eye when the lens element is worn by the person under standard viewing conditions.

[0127] The absolute value of the cylindrical power of at least 50%, for example at least 80%, for example all optical elements included in the region of interest is greater than or equal to 0.1 D, for example greater than or equal to 0.2 D. The absolute value of the cylindrical power is the value of the cylindrical power of the optical element itself, which value is positive or negative.

[0128] In other words, the absolute value of the cylindrical power of at least 50%, for example at least 80%, for example all optical elements included in the area of ​​interest is greater than or equal to -0.1D (for example greater than or equal to -0.2D, for example less than or equal to -0.5D) and less than or equal to 0.1D (for example less than or equal to 0.2D, for example less than or equal to 0.5D).

[0129] According to an embodiment of the present disclosure, at least 50%, for example at least 80%, for example all of the optical elements are refractive lenslets (for example aspherical lenslets), and the absolute value of the cylindrical power of at least 50%, for example at least 80%, for example all of the optical elements of the optical lens is greater than or equal to 0.1D, for example greater than or equal to 0.2D.

[0130] The absolute value of the cylindrical power is the value of the cylindrical power of the optical element itself, which value is positive or negative.

[0131] In other words, at least 50%, for example at least 80%, for example all of the optical elements are refractive lenslets (for example aspherical lenslets), and the absolute value of the cylindrical power of at least 50%, for example at least 80%, for example all of the optical elements of the optical lens is greater than or equal to -0.1D (for example greater than or equal to -0.2D, for example less than or equal to -0.5D) and less than or equal to 0.1D (for example less than or equal to 0.2D, for example less than or equal to 0.5D).

[0132] As is known, the minimum curvature CURV at any point on an aspherical surface is minIt can be defined by the following formula: Among them, R max is the local maximum radius of curvature, expressed in meters, and CURV min Expressed in diopters.

[0133] Similarly, the maximum curvature CURV at any point on an aspherical surface max It can be defined by the following formula: Among them, R min is the local minimum radius of curvature, expressed in meters, and CURV max Expressed in diopters.

[0134] It can be noted that when the surface is locally spherical, the local minimum radius of curvature R min and the local maximum curvature radius R max are the same, and accordingly, the minimum curvature CURV min and the maximum curvature CURV max When the surface is aspherical, the local minimum radius of curvature R min and the local maximum curvature radius R max different.

[0135] According to the minimum curvature CURV min and the maximum curvature CURV max These expressions, denoted SPH min and SPH max The minimum and maximum spherical powers can be inferred depending on the type of surface considered.

[0136] When the surface under consideration is the object-side surface (also called the front surface), these expressions are as follows:

[0137] and Where n is the refractive index of the lens's constituent material.

[0138] If the surface under consideration is the lateral surface of the eyeball (also called the posterior surface), these expressions are as follows:

[0139] and Where n is the refractive index of the lens's constituent material.

[0140] As is well known, the average spherical power SPHmean at any point on the aspherical surface can also be defined by the following formula:

[0141]

[0142] Therefore, the expression for the mean spherical power depends on the surface considered:

[0143] - If the surface is an object-side surface, then

[0144] - If the surface is the lateral surface of the eyeball, then

[0145] - Also through the formula CYL = | SPH max -SPH min |Define cylinder CYL.

[0146] The properties of any aspherical surface of a lens can be expressed in terms of the local average spherical power and cylindrical power.

[0147] For aspherical surfaces, the local cylindrical axis γ can be further defined AX . Figure 4 shows the astigmatism axis γ as defined in the TABO convention, while Figure 5 Shows the cylindrical axis position γ in the convention defined for characterizing aspheric surfaces AX .

[0148] Cylindrical axis γ AX is the maximum curvature CURV max The orientation of the eye is relative to a reference axis and in an angle in a selected rotational direction. In the convention defined above, the reference axis is horizontal (the angle of this reference axis is 0°) and the rotational direction is counterclockwise for each eye when looking at the wearer (0°≤γ AX ≤180°). Therefore, the cylindrical lens axis at +45° is γ AX The axis value of represents the obliquely oriented axis that extends from the upper right quadrant to the lower left quadrant when looking at the wearer.

[0149] At least a portion, for example greater than 50%, preferably all of the optical elements 14 may be lenslets having an outer shape that can be inscribed in a circle having a diameter greater than or equal to 0.2 mm (e.g. greater than or equal to 0.4 mm, for example greater than or equal to 0.6 mm, for example greater than or equal to 0.8 mm) and less than or equal to 2.0 mm (e.g. less than or equal to 1.0 mm).

[0150] For example, the area of ​​each optical element is greater than or equal to 0.4 mm 2 And less than or equal to 5mm 2 , for example, less than or equal to 4 mm 2 .

[0151] The ratio of the total area of ​​the optical elements to the total area of ​​the surface of the optical lens may be greater than or equal to 20% and less than or equal to 80%.

[0152] like Figure 2As shown, at least a portion, for example all, of the optical element 14 may be located on a front surface of the optical lens.The front surface of the lens element corresponds to the object side F1 of the lens element facing the object.

[0153] At least a portion, for example all, of the optical element 14 may be located on the back surface of the optical lens.The back surface of the lens element corresponds to the eye side F2 of the lens element facing the eye.

[0154] For example, when the lens element is encapsulated between two lens substrates, at least a portion, for example all, of the optical element 14 may be located between the front and back surfaces of the optical lens. Advantageously, this provides better protection for the optical element.

[0155] For each circular area having a radius between 2 mm and 4 mm and including a geometric center located at a distance greater than or equal to the radius + 5 mm from the optical center of the optical lens, the ratio of the sum of the areas of the optical element 14 located within the circular area to the area of ​​the circular area may be included between 20% and 70%.

[0156] The optical elements may be randomly distributed across the lens elements.

[0157] Alternatively and as Figure 1 As shown, the optical elements 14 may be organized along a plurality of concentric rings. The optical element concentric rings may be annular rings.

[0158] Advantageously, this configuration provides a good balance between mitigating refractive errors in the wearer's eye and the wearer's visual performance or comfort.

[0159] The optical lens may include optical elements arranged in at least two concentric rings, preferably more than 5, more preferably more than 10 concentric rings. For example, the optical elements may be arranged in 11 concentric rings centered on the optical center of the lens.

[0160] The diameter of the concentric rings of the optical element may be greater than or equal to 9.0 mm and less than or equal to 60 mm.

[0161] The distance between two consecutive concentric rings of the optical element may be greater than or equal to 0.5 mm, for example greater than or equal to 2 mm, the distance between two consecutive concentric rings being defined by the difference between the outer diameter of the first concentric ring and the inner diameter of the second concentric ring, the second concentric ring being closer to the periphery of the lens element.

[0162] According to an embodiment, the optical elements are arranged in concentric rings, and at least 60%, such as at least 75%, such as at least 90%, such as all of the optical elements have cylindrical axes oriented radially or orthogonally to the radial direction.

[0163] For example, at least 60%, for example at least 75%, for example at least 90%, for example all of the optical elements have an orientation of the respective cylindrical axes that deviates by less than or equal to 5°, for example less than or equal to 2, from the local radial direction relative to the optical center of the optical lens or the direction orthogonal to the radial direction.

[0164] The diameter of all optical elements on a concentric ring of a lens element may be the same. For example, all optical elements on a lens element have the same diameter.

[0165] The optical element has a controlled cylindrical lens in a region of interest, which may extend radially from the optical center of the optical lens.

[0166] like Figure 1 As illustrated, when the optical element is positioned along at least 5 concentric rings and the region of interest extends radially over the at least 5 concentric rings.

[0167] Alternatively, at least 50%, such as at least 80%, such as all of the optical elements are positioned on the lens element in a mesh (e.g. a structured mesh). The structured mesh may be a square mesh or a hexagonal mesh or a triangular mesh or an octagonal mesh or a honeycomb mesh. Alternatively, the mesh structure may be a random mesh, such as net.

[0168] Figure 3 An embodiment is shown in which the optical elements are positioned on a cellular network.

[0169] like Figure 3 As shown, the region of interest 20 may include the optical center of the optical lens and have a width of at least 150 mm. 2 , for example at least 200 mm 2 .

[0170] although Figure 3 Display with honeycomb net, but the area of ​​interest can have at least 150mm with different positioning of optical elements 2 .

[0171] The standard deviation of the orientation of the cylindrical axes of at least 50%, such as at least 90%, such as all optical elements may be smaller than or equal to 20°, such as smaller than or equal to 15° relative to the common predefined direction.

[0172] At least 20%, such as at least 40%, of the optical elements may have an orientation difference of the cylindrical axis position smaller than or equal to 5°, such as smaller than or equal to 2°, relative to the common predefined direction.

[0173] The present disclosure also relates to a method for determining the cylindrical orientation of an optical element of an optical lens according to the present disclosure.

[0174] This method first requires measuring the surface of the optical lens. This surface measurement can be performed by a tactile surface measuring instrument or a non-contact instrument.

[0175] A surface profiler, a coordinate measuring machine or a non-contact 3D optical profiler or any other known surface measuring device may be used.

[0176] Depending on the technology used, local or global areas can be measured. Some options are available for measuring larger areas, such as rectangular or circular stitching. The goal is to measure the optical element at least over the area of ​​interest.

[0177] The top surface of the optical lens or the surface below the coating(s) can be measured, or even an optical element encapsulated between the front and back surfaces of the optical lens can be measured. For example, interferometry can be used to measure the surface of the optical element. In this case, the refractive index of the coating(s) should be known to compensate for the height and infer the true surface from it.

[0178] The second step of the method is to remove the shape of the refractive area of ​​the optical lens. The shape of the refractive area should be removed before any other metrological operation. This step can be performed using any known standard solution for analyzing profilometry and topographic data.

[0179] The shape of the refractive zone is usually a rotational shape (cylindrical, spherical) corresponding to the prescription of the wearer's eye. The metrologist performs an adjustment or shape removal before the calculation of the surface condition parameters. This operation consists in modeling the shape and associating it with the measured points, then subtracting the shape and obtaining a flat surface. It may be useful to remove the natural shape by spherical equations, by complex polynomial equations, by filtering or by complex algorithms using Zernike polynomials.

[0180] When the basis radius is unknown, it can be calculated by the method of least squares. A standard approach in regression analysis is to approximate the solution of an overdetermined system by minimizing the sum of the squares of the residuals obtained in the solution of each equation.

[0181] The same approach can be used with polynomials involving powers higher than 3. An alternative approach is to define the fitting surface based on a classical subset of orthogonal Zernike polynomials.

[0182] Several statistical parameters can be used as indicators to determine the best method or the best approximation order: RMS root mean square, average roughness, and area flatness deviation.

[0183] The third step is to create clusters using optical elements to perform analysis.

[0184] At least three methods can be used:

[0185] o Slope filtering method, or

[0186] ο height clip method, or

[0187] οHistogram method.

[0188] Slope filtering methods involve filtering or removing data based on its slope or the angle formed from one pixel to surrounding pixels.

[0189] The height clipping method involves removing data based on a function of the height relative to a chosen reference.

[0190] The histogram method involves removing data based on the height of a function relative to a height histogram.

[0191] The fourth step is to determine the cylinder of the optical element using orthogonal Zernike polynomials.

[0192] Zernike polynomial expressions are well known to those skilled in the art. For example, the polynomial expression is defined as follows:

[0193]

[0194] where r is the radial coordinate ranging from 0 to 1, θ is the azimuthal component ranging from 0 to 2n, The polynomial coefficients are defined. is the corresponding normalization factor, and is a radial polynomial defined below. The index n describes the highest power (order) of the radial polynomial, while the index m describes the azimuthal frequency of the sinusoidal component.

[0195] The radial functions satisfy the orthogonality relation:

[0196]

[0197] and is normalized so that

[0198] Orthogonality is only satisfied if there are no "no data" regions within the unit circle. The following relations are used to convert between polar and Cartesian coordinates:

[0199] θ=tan -1 (y / x), x=r cos(θ), and y=r sin(θ)

[0200] Alternatively, equation (1) can be expressed in terms of even and odd polynomials:

[0201]

[0202] where the even polynomial is given by:

[0203]

[0204] And the odd polynomial is given by:

[0205]

[0206] The radial polynomial can be generally written as:

[0207]

[0208] The normalization factor is defined as:

[0209]

[0210] Among them, δ m0 Kronecker delta function:

[0211]

[0212] Under RMS normalization, the polynomials are orthogonal and the sum in quadrature of the fitting coefficients is equal to the energy of the fitted function.

[0213] Cylindricity based on Zernike polynomials is a third order wavefront aberration where light rays on two orthogonal axes do not focus in the same plane. Zernike polynomials are used to calculate the Seidel result and at least 9 Zernike terms must be analyzed to show this result.

[0214] The cylinder angle based on the Zernike polynomials is the angle at which astigmatism occurs in the instrument coordinate system. The range of values ​​is ±90°. The Zernike polynomials are used to calculate the Seidel result and at least 9 Zernike terms must be analyzed to display this result.

[0215] Cylinder Angle = 0.5arctan(Coef 2,-2 / Coef 2,2 )

[0216] The conversion of Zernike or Seidel results from μm to diopters is known to the skilled person and is disclosed, for example, in “Encyclopedia of Modern Optics” Second Edition, Volume 5, page 110, published by Elsevier Ltd. in 2018.

[0217] Measuring lenslets across the entire surface of an optical lens with currently available measurement devices can be complicated.The present disclosure further relates to a method of measuring the entire surface of an optical lens using currently available interferometric measurement devices.

[0218] Interference measurement devices are capable of measuring the shape, waviness, and roughness of the surface of an optical lens, especially the surface of an optical element, by using a technique that uses interference of superimposed waves to extract height information (x, y, z data).

[0219] Combining the X, Y motorized stage and the stitching process, the measurement range can be extended to be larger than the field of view of the initial objective lens.

[0220] Due to limitations according to the slope of the objective lens, it is only possible to measure the portion of the optical element extending radially from the center to the periphery of the optical lens. This allows measurements to be made on a region of interest extending radially from the optical center of the optical lens.

[0221] However, it is not possible to form a circle, for example Figure 1 The lenslet shown is measured on the ring.

[0222] Using a rotating stage adapted to the measurement setup, each lenslet can be measured in terms of rotational position. Using basic mathematical procedures, the actual x,y position of each photo can be calculated and the final results stitched together to obtain a measurement over the entire lenslet ring.

[0223] Most measurement setups use the x,y position of each frame to calculate the final stitching, since the accuracy is better than using common data from each frame. Finally, all structures of the optical element can be measured, e.g. Figure 1 The 11 optical element rings are represented.

[0224] This method can also be used to measure packaged optical components, that is, optical components included between the front and back surfaces of an optical lens, or under a coating.

[0225] The present disclosure has been described above by means of embodiments without limiting the general inventive concept. Many further modifications and variations will be apparent to those skilled in the art upon reference to the foregoing illustrative embodiments, which are given by way of example only and are not intended to limit the scope of the present disclosure, which is determined solely by the appended claims.

[0226] In the claims, the word "comprising" does not exclude other elements or steps, and the indefinite article "a or an" does not exclude a plurality. The mere fact that different features are recited in mutually different dependent claims does not indicate that a combination of these features cannot be used to advantage. Any reference signs in the claims shall not be construed as limiting the scope of the disclosure.

Claims

1. An optical lens intended to be worn by a wearer, the optical lens comprising: - a refractive zone having a refractive power based on a prescription for the wearer's eyes; - a plurality of optical elements having a transparent optical function of not focusing an image on the retina of the eye of the wearer when the optical lens is worn under standard wearing conditions, a region of interest comprising a subset of said optical elements, each optical element in said subset carrying a lenticular element on its surface, Wherein, the area of ​​interest includes the optical center of the optical lens and has a radius of at least 500 mm. 2 ,and A standard deviation of the orientation of the cylindrical axis of each optical element included in the region of interest is less than or equal to 15° relative to a common predefined direction.

2. The optical lens according to claim 1, wherein: The region of interest comprises at least 10 optical elements having a transparent optical function that does not focus an image on the retina of the eye of the wearer when the lens element is worn under standard wearing conditions.

3. The optical lens according to claim 1 or 2, wherein: At least 50% of the optical elements have an optical function of focusing an image outside the retina of a human eye when the optical lens is worn under standard wearing conditions.

4. An optical lens according to any one of the preceding claims, wherein: The absolute value of the cylindrical power of at least 50% of the optical elements is greater than or equal to 0.1D.

5. An optical lens according to any one of the preceding claims, wherein: At least a portion of one of the front and back surfaces of the optical lens comprises at least one layer of at least one coating element, the at least one coating element covering at least a portion of the surface on which the optical element is placed.

6. An optical lens according to any one of the preceding claims, wherein: At least 50% of the optical elements are located on one of the surfaces of the optical lens.

7. An optical lens according to any one of the preceding claims, wherein: At least 50% of the optical elements are located between the front and back surfaces of the optical lens.

8. An optical lens according to any one of the preceding claims, wherein: At least 50% of the optical elements are refractive lenslets.

9. An optical lens according to any one of the preceding claims, wherein: The region of interest extends radially from the optical center of the optical lens.

10. An optical lens according to any one of the preceding claims, wherein: At least 50% of said optical elements are positioned along at least 5 concentric rings, and wherein said region of interest extends radially over at least 5 of said concentric rings.

11. An optical lens according to any one of the preceding claims, wherein: At least 50% of the optical elements are positioned on a structured mesh, which is a square mesh or a honeycomb mesh or a triangular mesh or an octagonal mesh.

12. An optical lens according to any one of the preceding claims, wherein: The optical area of ​​interest includes the optical center of the optical lens and has a radius of at least 1000 mm. 2 .

13. An optical lens according to any one of the preceding claims, wherein: The standard deviation of the orientations of the cylindrical axes of at least 50% of the optical elements is less than or equal to 20° relative to a common predefined direction.

14. An optical lens according to any one of the preceding claims, wherein: At least 20% of said optical elements have a misorientation of the cylindrical axis position less than or equal to 5° relative to a common predefined direction.

15. An optical lens according to any one of the preceding claims, wherein: The ratio of the total area of ​​the optical elements to the total area of ​​the surface of the optical lens is greater than or equal to 20% and less than or equal to 80%.

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