Perimetrically varying modified ophthalmic lens

Abstract

The disclosure relates to an ophthalmic lens comprising: - a first face and a second face, each face having a profile adapted so that the lens is mountable in an eyeglass frame, and - a reference point O on the first face set in front of the pupil of the eye of the wearer when the lens is mounted in the eyeglass frame and in the wearing conditions, characterized in that, for a point P of an arc A 12 J , the radial profile R Pj of the first face has a radial curvature between O and P J separated from P J' by 1 mm which changes sign over a distance D J' less than or equal to 14 mm from point P max towards O, and for any point P 12 of said first face profile outside said arc A K , the radial profile R Pk has a radial curvature between O and P K separated from P K' by 1 mm which keeps its sign between O and P K' .​

Description

Technical Field

[0001] This disclosure relates to an ophthalmic lens. More specifically, this disclosure relates to an ophthalmic lens having a curvature variation on a portion of its peripheral portion. Background Technology

[0002] It is known that some existing ophthalmic lenses involve aesthetic and mechanical issues.

[0003] For nearsighted wearers, aesthetic disharmony may occur on the temporal side. For farsighted wearers, aesthetic disharmony occurs on the nasal side, for example, due to the thicker nasal portion of the ophthalmic lens causing an improperly positioned nose pad.

[0004] The first mechanical problem is that for nearsighted wearers who wear ophthalmic lenses with thicker temporal edges, the temples of the eyewear cannot be fully closed / folded.

[0005] The second mechanical problem is that chamfering on the periphery of ophthalmic lenses is complicated due to the variability of edge thickness.

[0006] The third issue is that there is contact between the ophthalmic lens and the frame, specifically at the nose pads, temples, and hinges. This can pose a risk of damage to the ophthalmic lens, for example, in eyewear for nearsighted individuals, where this problem exists at the contact points between the lens and the frame.

[0007] The purpose of this disclosure is to provide a lens that addresses the problems listed above without affecting the optical functions that ophthalmic lenses must provide to the wearer in the central portion. Summary of the Invention

[0008] Therefore, this disclosure relates to an ophthalmic lens for correcting visual impairment in a wearer's eye. The ophthalmic lens includes a first surface and a second surface, each of which has a profile adapted to allow the lens to be mounted in an eyeglass frame. When the lens is mounted in the eyeglass frame and in a wearing condition, a reference point O of the first surface of the ophthalmic lens is positioned in front of the pupil of the wearer's eye. The profile of the first surface includes an arc A having a first endpoint P1 and a second endpoint P2. 12 The first face is at point P on the outline of the first face. I Radial distribution R at the location Pi It is obtained by intersecting with a plane that includes the normal direction Z of the first surface at reference point O and passes through point P. I , Its characteristic is that, for arc A 12 At least one point P J The first side is at reference point O and point P. J Between them, including point PJ Point P, spaced 1 mm apart J' radial distribution R Pj The radial curvature it possesses from point P J' Oriented towards reference point O at a distance D less than or equal to 14 mm max Change the sign at least once. And for the first surface contour in the arc A 12 Any point P other than K The first side is in O and P K Between including P K Point P, spaced 1 mm apart K' radial distribution R Pk The radial curvature it possesses in O and P K' The sign remains unchanged between them.

[0009] Advantageously, this type of ophthalmic lens makes it possible to solve the aforementioned aesthetic and mechanical problems. By adjusting the curvature (and thickness) of the peripheral portion of the lens, the ophthalmic lens can be better accommodated without the need for a stepped portion. Stepped portions are unsightly and can weaken the ophthalmic lens at its thinnest point.

[0010] Advantageously, ophthalmic lenses with curvature variations in their peripheral portions, according to this disclosure, enable the introduction of no optical interference in the central portion of the lens (e.g., a cone having a generatrix passing through the retina and the optical center of the lens). The cone has, for example, an angular size of less than or equal to 50°.

[0011] Preferably, when installed in an eyeglass frame and worn by a wearer, the peripheral portion, including the curvature variation, is located on the temporal side of the lens to facilitate a comfortable fit within the frame.

[0012] Other embodiments of the method, which can be considered individually or in combination: - The reference point O on the first surface of an ophthalmic lens is the optical center of the lens, or a distance vision reference point, or a fitting cross; and / or - The sign change of the radial curvature within arc A12 has an angular sector of less than or equal to 120° and greater than or equal to 10° set on the temporal side of the ophthalmic lens; and / or -wherein, in arc A 12 any point P J At the reference point O and point P on the first side. J Between them, including point P J Point P, spaced 1 mm apart J' radial distribution R Pj The radial curvature it possesses from point P J'' Oriented towards reference point O at a distance D less than or equal to 14 mm maxAt least one sign change; and / or - The first endpoint P1 has an azimuth coordinate θ1 in a cylindrical coordinate system R on the first surface, with the origin at the reference point O. The second endpoint P2 has an azimuth coordinate θ2 in the cylindrical coordinate system R. Arc A 12 Having an angular sector |θ2-θ1| greater than 10°, preferably greater than 45°; and / or - Under wearing conditions, arc A 12 Located on the temporal side of the ophthalmic lens; and / or -Distance D max Less than 9 mm, preferably less than 6.5 mm; and / or -For each radial distribution R Pj In arc A 12 Point P inside J Between point P and reference point O, point P J'' Located at point P, starting from reference point O J The radial curvature first changes sign at point P. J'' Each of the components forms a continuous curve. Wherein, the projection of the continuous curve onto a plane perpendicular to the normal direction Z at reference point O is non-circular; and / or - The first surface of an ophthalmic lens is the surface of the lens that is closest to the eye when worn; and / or -wherein, arc A 12 Point P J In the cylindrical coordinate system R, it has a sag coordinate Z. Pj radial distribution R Pj Point P J'' At reference point O and point P J' Between points, the radial curvature is located from reference point O toward point P. J The first change of the sign's position, and it is located at the distance point P. J' Distance D max Small distance D J It is located at a point in the cylindrical coordinate system R and has a sag coordinate Z. Pj'' , Virtual Point Q J It is a radial distribution R Pj Part of the OP J'' From point P J'' Start at a distance of D J Extrapolation on, wherein the virtual point Q J In the cylindrical coordinate system R, it has a sag coordinate Z. Qj , Its characteristic is that, when the ophthalmic lens has a negative average optical power at reference point O, Preferably less than 0.8, and provided that the ophthalmic lens has a positive average optical power at reference point O. Preferably greater than 1.2; and / or - The first surface of an ophthalmic lens is the surface of the lens that is furthest from the eye under wearing conditions; and / or -Arc A 12 Point P J In the cylindrical coordinate system R, it has a sag coordinate Z. Pj radial distribution R Pj Point P J'' At reference point O and point P J' Between points, the radial curvature is located from reference point O toward point P. J The first change of the sign's position, and it is located at the distance point P. J' Distance D max Small distance D J It is located at a point in the cylindrical coordinate system R and has a sag coordinate Z. Pj'' Virtual point Q j It is a radial distribution R Pj Part of the OP J'' From point P J'' Start at a distance of D J Extrapolation on, wherein the virtual point Q J In the cylindrical coordinate system R, it has a sag coordinate Z. Qj The feature is that, when the ophthalmic lens has a negative average optical power at reference point O, Preferably greater than 1.2 When the ophthalmic lens has a positive average optical power at reference point O. Preferably less than 0.8; and / or - The ophthalmic lens is a progressive multifocal lens, and reference point O is a distance vision reference point; and / or - The average optical power at reference point O has an absolute value greater than 2 D; and / or - The ophthalmic lens further includes at least one optical element disposed between the first surface and the second surface, wherein the optical element generates a myopia-stopping optical signal toward the wearer's eye.

[0013] This disclosure also relates to an eyewear comprising at least one ophthalmic lens according to this disclosure. Attached Figure Description

[0014] Non-limiting embodiments of this disclosure will now be described by way of example only and with reference to the following figures, in which: - Figure 1 and Figure 2The diagram illustrates the optical system of the eye and lenses, as well as ray tracing from the center of rotation of the eye; - Figure 3 The field of view of a progressive multifocal ophthalmic lens is shown; - Figure 4 The first surface of the lens according to this disclosure is shown in cylindrical coordinates; - Figure 5 It shows Figure 4 The projection of the lens onto a plane perpendicular to the normal direction of the first surface at reference point O; and - Figure 6 It shows the radial distribution R Pj The change in the sag. definition

[0015] The following definitions are provided to clarify the meaning of the terminology used within the framework of this disclosure.

[0016] The term "wearer's prescription" (also known as "prescription data") is known in the art. Prescription data refers to one or more data obtained for a wearer that indicates, for at least one eye, preferably for each eye, a prescription spherical power SPHp and / or a prescription astigmatism value CYLp, a prescription axis AXISP (suitable for correcting refractive errors in each eye of the wearer), and a prescription add (suitable for correcting presbyopia in each eye of the wearer). When an ECP orders ophthalmic lenses from an ophthalmic lens manufacturer, he / she provides prescription optical data, such as prescription power, prescription add, and / or prescription astigmatism.

[0017] Prescription optical power may include prescription distance optical power, which corresponds to the optical power provided to the wearer to correct visual impairment when the wearer is looking at a distant object.

[0018] Prescription optical power may include prescription near focal power, which corresponds to the optical power provided to the wearer to correct visual impairment when the wearer is focusing on near objects.

[0019] Ophthalmic lens manufacturers typically include information about prescription under-illuminance on the paper packaging of the delivered lenses. Prescription under-illuminance can also be identified by engraved markings located on the ophthalmic lens, which remain visible after the lens has been edged and when it is installed in the eyeglass frame chosen by the wearer.

[0020] "Progressive multifocal ophthalmic lenses" are known in the art. According to this disclosure, ophthalmic lenses can be unground or ground for mounting in eyeglass frames. Ophthalmic lenses can also be adapted for sunglasses. All ophthalmic lenses disclosed herein can be paired to form a single lens (left eye LE, right eye RE).

[0021] The term "optical design" is a widely used term known to ophthalmologists to refer to a set of parameters that allow for the definition of the optical function of an ophthalmic lens. Each ophthalmic lens designer has their own design, especially for progressive lenses. For example, a progressive lens "design" is the result of optimizing the progressive surface to restore the ability of presbyopic individuals to see clearly at all distances, while also optimally respecting all physiological visual functions (such as foveal visual acuity, exterofoveal visual acuity, binocular visual acuity, and dynamic visual acuity) and minimizing undesirable astigmatism. For example, progressive lens designs include: - The distribution of focal power along the primary direction of fixation (meridian) used by the wearer during daily activities of life. - The distribution of focal length (average focal length, astigmatism, etc.) on the side of the ophthalmic lens, that is, away from the main direction of gaze.

[0022] These optical properties are defined and calculated by ophthalmic lens designers and are part of the "design" provided with progressive lenses.

[0023] The "direction of gaze" is identified by a pair of angle values ​​(α, β), where these angle values ​​are measured relative to a reference axis centered at the lens center O. More precisely, Figure 1 The diagram shows a perspective view of ophthalmic lens 1 and illustrates the parameters α and β used to define the gaze direction. Figure 1 The angle α shown has a negative value. The primary gaze direction can be defined for a pair of angle values ​​(α = 0°, β = 0°).

[0024] In other embodiments, as shown in Figures 8a to 16b, the reference axis is centered on the lens mounting point.

[0025] Figure 2 This is a view taken in a vertical plane parallel to the anterior-posterior axis of the wearer's head and passing through the center of rotation of the eye, with parameter β equal to 0. The center of rotation of the eye is marked Q'. Figure 2The axis Q'-F', shown as a dashed line, is a horizontal axis passing through the center of rotation of the eye and extending in front of the wearer; that is, the axis Q'-F' corresponding to the primary gaze direction. The ophthalmic lens is placed in front of and centered on the eye, such that axis Q'-F' intersects the front of the lens at a point called the fitting cross, which is usually present on the lens to allow the optician to position the lens in the frame. The point where the back of the ophthalmic lens intersects axis Q'-F' is point O. A vertex sphere (whose center is the center of rotation of the eye Q' and has a radius q' = O-Q') intersects the back of the ophthalmic lens at a point on the horizontal axis. A radius q' of 25.5 mm corresponds to a commonly used value and provides satisfactory results when fitting ophthalmic lenses. Other values ​​for the radius q' can be selected. The given gaze direction (by...) Figure 1 The solid line in the diagram represents the position where the eye rotates around Q' and point J on the vertex sphere (see [reference]). Figure 2 ).

[0026] Angle β is the angle formed between the axis Q'-F' and the projection of the line Q'-J onto the horizontal plane including the axis Q'-F'; this angle appears Figure 1 On the diagram.

[0027] Angle α is the angle formed between the axis Q'-J and the projection of the line Q'-J onto the horizontal plane including the axis Q'-F'; this angle appears Figure 1 and Figure 2 On the diagram.

[0028] Therefore, a given gaze direction corresponds to point J on the vertex sphere or to a pair of values ​​(α, β). The greater the positive value of the gaze reduction angle α, the greater the gaze reduction, and vice versa. In a given gaze direction, the image of point M in object space at a given object distance is formed between two points S and T corresponding to the minimum distance JS and the maximum distance JT, which will be the sagittal local focal length and the tangential local focal length, respectively. The image of a point at infinity in object space is formed at point F'. Distance D corresponds to the posterior coronal plane of the ophthalmic lens.

[0029] For each gaze direction (α,β), the mean refractive power PPO(α,β), the magnitude of astigmatism AST(α,β), the axis of the astigmatism AXE(α,β), and the magnitude of the composite astigmatism (also known as residual astigmatism or undesirable astigmatism) ASR(α,β) are defined.

[0030] "Astigmatism" refers to astigmatism generated by ophthalmic lenses, while "undesired astigmatism" or synthetic astigmatism corresponds to the difference between astigmatism generated by ophthalmic lenses and prescription astigmatism (wearer's astigmatism); in each case, in terms of amplitude, or in terms of both amplitude and axis.

[0031] In the sense of this disclosure, "optical function" corresponds to the function of providing an optical lens with information about the effect of light passing through it for each gaze direction.

[0032] Optical functions can include refractive function, light absorption, polarization ability, contrast enhancement ability, etc.

[0033] Refractive function corresponds to the optical lens power (mean power, astigmatism, etc.) that changes according to the direction of gaze.

[0034] The "Aigma function" is a function that relates the typical distance of an object point to each gaze direction. Typically, in far vision following the dominant gaze direction, the object point is at infinity. In near vision (following a gaze direction that substantially corresponds to an angle α of approximately 35° and an angle β of approximately 5° toward the nose), the object distance is approximately 30 cm to 50 cm. For more details regarding a possible definition involving the Aigma function, see U.S. Patent US-A-6,318,859. This document describes the Aigma function, its definition, and its modeling methods.

[0035] For the purposes of this disclosure, the point may or may not be at infinity. The Igma function can be a function of the wearer's refractive error. Using these elements, the wearer's optical power and astigmatism can be defined for each gaze direction. Consider an object point M located at the object distance given by the Igma function for the gaze direction (α, β). For a point M on the corresponding ray in object space, the object-space proximity ProxO is defined as the reciprocal of the distance MJ between point M and point J on the vertex sphere: ProxO = 1 / MJ

[0036] This allows for the calculation of the object-side proximity for all points on the vertex sphere under the thin lens approximation condition, which is used to determine the Eigma function. For a real lens, the object-side proximity can be considered as the reciprocal of the distance between the object point and the front surface of the ophthalmic lens along the corresponding ray.

[0037] For the same gaze direction (α, β), the image of point M with a given object-side proximity is formed between two points S and T, corresponding to the minimum and maximum focal lengths (which will be the sagittal and tangential focal lengths, respectively). The quantity Proxl is called the image-side proximity of point M:

[0038] Therefore, by analogy with the case of thin lenses, for a given gaze direction and a given object proximity, that is, for a point in the object space on the corresponding ray, the optical power PPO can be defined as the sum of the image proximity and the object proximity. PPO = ProxO + Proxl

[0039] Optical power is also called refractive power.

[0040] Using the same notation, an astigmatic AST is defined for each gaze direction and given object proximity.

[0041] This definition corresponds to astigmatism in the beam of light produced by an ophthalmic lens. For each gaze direction passing through the ophthalmic lens, synthetic astigmatism (ASR) is defined as the difference between the actual astigmatism value (AST) and the prescribed astigmatism in that gaze direction. Undesirable astigmatism (synthetic astigmatism) ASR more precisely corresponds to the magnitude of the vector difference between the actual data (AST, AXE) and the prescribed data (CYLp, AXISp).

[0042] When the characterization of an ophthalmic lens is in terms of optical type, it refers to the aforementioned Igma function-eye-lens system. For simplicity, the term "lens" is used in this specification, but it must be understood as "Igma function-eye-lens system." Values ​​in the optical terms can be expressed with respect to the direction of gaze. Within the framework of this disclosure, the conditions suitable for determining the Igma function-eye-lens system are referred to as "given wearing conditions."

[0043] In the remainder of this specification, terms such as “upper,” “bottom,” “horizontal,” “vertical,” “above,” “below,” or other words indicating relative position may be used. These terms should be understood under the conditions of wearing the ophthalmic lens. It is worth noting that the “upper” portion of an ophthalmic lens corresponds to a negative lowering angle α < 0°, and the “lower” portion of an ophthalmic lens corresponds to a positive lowering angle α > 0°.

[0044] For ophthalmic lenses, "distance gaze direction" is defined as the visual gaze direction corresponding to a distance (hyperopia) reference point. In this disclosure, distance vision is also referred to as distance visual acuity. In the context of this disclosure, distance vision should be understood as visual acuity at a distance of 4 meters or greater.

[0045] For ophthalmic lenses, "near fixation direction" is defined as the visual fixation direction corresponding to the near (reading) reference point. In embodiments of progressive multifocal lenses, the refractive power is substantially equal to the prescription focal power for distance vision plus the prescription add power. In the sense of this disclosure, near vision should be understood as visual acuity at distances less than or equal to 50 cm. Here, "substantially equal to" means "equal to a tolerance of up to 15%". In this way, distances up to 57.5 cm are considered near distances.

[0046] For ophthalmic lenses, "central gaze direction" is defined as the visual gaze direction corresponding to central gaze (when a person is working in front of their computer desktop). In the sense of this disclosure, central gaze should be understood as visual acuity at a distance greater than 50 cm (e.g., greater than 70 cm) and less than 4 meters (e.g., less than 1.5 m).

[0047] The "meridian" (referred to as ML(α,β)) of a progressive multifocal lens is a line defined from the top to the bottom of the lens, passing through the fitting cross, along which the object point can be clearly seen. This meridian is defined based on the redistribution of the modulus of the synthetic astigmatism (ASR) over the (α,β) domain, and essentially corresponds to the center of the two central isomotor lines of the synthetic astigmatism value, both of which are equal to 0.5 D.

[0048] Figure 3 The visual field of a progressive multifocal ophthalmic lens 30 is shown, wherein the lens includes a distance vision zone 32 in the upper portion of the lens, a near vision zone 36 in the lower portion of the lens, and an intermediate vision zone 34 located between the distance vision zone 32 and the near vision zone 36. Meridians are labeled 38.

[0049] "Wearing conditions" should be understood as the position of the ophthalmic lens relative to the wearer's eye, defined by factors such as the anterior tilt angle, distance from the cornea to the lens, distance from the pupil to the cornea, distance from the CRE to the pupil, distance from the CRE to the lens, and the wrap angle.

[0050] The corneal-to-lens distance is the distance between the cornea and the back of the ophthalmic lens along the visual axis of the eye in the primary position (which is usually considered to be horizontal); for example, it is equal to 12 mm.

[0051] The pupil-to-corneal distance is the distance between the pupil and the cornea along the visual axis of the eye; it is usually equal to 2 mm.

[0052] The distance from the CRE to the pupil is the distance along the visual axis of the eye between its center of rotation (CRE) and the pupil; for example, it is equal to 11.5 mm.

[0053] The CRE-to-lens distance is the distance between the CRE of the eye and the back of the ophthalmic lens along the visual axis of the eye in the first eye position (which is usually considered to be horizontal), for example, equal to 25.5 mm.

[0054] The anterior tilt angle is the angle between the normal to the back of the ophthalmic lens and the visual axis of the eye in the first eye position (which is usually considered to be horizontal) at the intersection of the back of the ophthalmic lens and the visual axis of the eye in the first eye position in a vertical plane; for example, it is equal to -8°.

[0055] The wrap angle is the angle between the normal to the back of the ophthalmic lens and the visual axis of the eye in the first eye position (which is usually considered to be horizontal) at the intersection of the back of the ophthalmic lens and the visual axis of the eye in the first eye position on a horizontal plane, for example, equal to 0°.

[0056] Examples of standard wearing conditions can be defined by an anterior tilt angle of -8°, a corneal-to-lens distance of 12 mm, a pupil-to-corneal distance of 2 mm, a CRE-to-pupil distance of 11.5 mm, a CRE-to-lens distance of 25.5 mm, and a wrap angle of 0°. Detailed Implementation

[0057] Figure 4 This demonstrates the use of cylindrical coordinates R ( An ophthalmic lens 1 for correcting visual impairment in a wearer's eye (θ, Z). The ophthalmic lens includes a first surface 12 (which is the back of the ophthalmic lens 1 and is configured to face the wearer's left eye when mounted in an eyeglass frame) and a second surface. Each of the first surface and the second surface has a profile adapted to allow the lens 1 to be mounted in an eyeglass frame. More specifically, Figure 4 The first surface of the lens is shown in cylindrical coordinate system R.

[0058] The first surface 12 of the ophthalmic lens 12 includes a reference point O, which is configured to be positioned in front of the pupil of the wearer's eye when the lens 1 is mounted in an eyeglass frame and is in a wearing condition.

[0059] The wearing conditions can be the standard wearing conditions.

[0060] Point O can be the optical center of the lens. The optical center can be as defined in section 3.2.15 of ISO 13666:2019.

[0061] In an alternative embodiment, the ophthalmic lens may be a progressive multifocal lens, and the reference point O may be a distance reference point (also referred to as a distance reference point in section 3.2.20 of ISO 13666:2019) or a fitting cross (also referred to as a fitting point in section 3.2.34 of ISO 13666:2019 (EN)).

[0062] The outline of the first face 12 includes an arc A having a first endpoint and a second endpoint defined by points P1 and P2. 12 .

[0063] The first surface is at point P on the outline of the first surface. I Radial distribution R at the location Pi It is defined as the intersection of a plane and the first surface. This plane is defined according to the following constraints: - This plane includes the normal direction of the first surface at reference point O, and -The plane includes point P I ,as well as - This plane can be defined by each point on the plane having the same azimuth coordinate θ in the cylindrical coordinate system R. I This condition is used to define it.

[0064] For arc A 12 At least one point P J The radial distribution R of the first surface will be considered. Pj Radial distribution R Pj Based on the angular direction θ of the cylindrical coordinate system R I At reference point O and point P J Extending between them. Radial distribution R Pj At point O and point P J Between points including point P J' Radial distribution R Pj Point P J and P J' The angular direction θ in the cylindrical coordinate system R J Up. Point P J' With point P J Spacing 1 mm. Radial distribution R Pj The radial curvature it possesses from point P J' Oriented towards reference point O at a distance D max The sign must be changed at least once. Distance D max Less than or equal to 14 mm.

[0065] R distributed along the radial direction Pj The curvature is defined by the following equation:

[0066] in, According to along the angle θ J radial distribution R Pj Define the elevation of any point on the first face 12:

[0067] This equation allows the sag of the first surface to be expressed using constraints on slope (the first radial derivative) and curvature (related to the second radial derivative). Based on these two equations, the curvature... Changes and Sagitta It provides a connection between the changes.

[0068] Advantageously, R is distributed radially. Pj At least one sign change of the radial curvature occurs in the peripheral portion 14 of the ophthalmic lens. In this way, the optical functions provided in the central portion 16 are not altered.

[0069] For the contour of the first surface, in arc A 12 Any point P other than K The radial distribution R of the first surface Pk Based on the angular direction θ of the cylindrical coordinate system R K At reference point O and point P K Extending between them. Radial distribution R Pk Including point P K'。 Radial distribution R Pk Point P k and P K' The angular direction θ in the cylindrical coordinate system R k Up. Point P K' With point P K Spacing 1 mm. Radial distribution R Pk Its radial curvature causes its sign to be in O and P K' The relationship remains unchanged.

[0070] According to the embodiment, for any point P of arc A12 J The first side is at reference point O and point P. J Radial distribution R between Pj Including point P J' Point P J' With point P J Spacing 1 mm. Radial distribution R Pj The radial curvature it possesses from point P J' Oriented towards reference point O at a distance D max The sign must be changed at least once. Distance D max Less than or equal to 14 mm.

[0071] The first endpoint is defined by point P1, which lies in the cylindrical coordinate system R with the origin as the reference point O (in... Figure 1 (as shown in the image) is determined by coordinates ( The second endpoint is defined by point P2, which is defined in cylindrical coordinate system R by coordinates (1, θ1, Z1). Defined as 2, θ2, Z2).

[0072] Arc A 12 Defined by the corner sector OP1P2. The corner sector is defined such that the angle at the reference point defined by the equation |θ2-θ1| can be less than 120°, preferably less than 90° and greater than 10°, and preferably greater than 45°.

[0073] In a preferred embodiment, when lens 1 is installed in the eyeglass frame and is worn, arc A 12 It is placed on the temporal side of ophthalmic lens 1.

[0074] In a preferred embodiment, the ophthalmic lens 1 is configured to face the back of the wearer's left eye when mounted in an eyeglass frame. In the cylindrical coordinate system R, the temporal side is defined with respect to angles θ1 greater than or equal to 90° and angles θ2 less than or equal to 270°. Similarly, the ophthalmic lens 1 is configured to face the back of the wearer's right eye when mounted in an eyeglass frame. In the cylindrical coordinate system R, the temporal side is defined with respect to angles θ1 less than or equal to 90° and angles θ2 greater than or equal to 270°.

[0075] For example, arc A 12 The sign change of the radial curvature within has an angular sector set on the temporal side of the ophthalmic lens that is less than or equal to 120°, preferably less than or equal to 90° and greater than or equal to 10°, preferably greater than or equal to 45°.

[0076] According to an embodiment, distance D max Less than 9 mm, preferably less than 6.5 mm. Advantageously, the change occurs closer to the contour of the first surface 12. With D max The reduction in curvature of the lens (the portion without curvature change due to radial distance) (Definition) increased.

[0077] In a particular embodiment, the first surface 12 of the ophthalmic lens 1 is the surface of the lens that is closest to the eye under wearing conditions.

[0078] Arc A 12 Point P J In the cylindrical coordinate system R, it has a sag coordinate Z. Pj radial distribution R Pj Point P J'' ( Figure 5 Located between reference point O and point P J' Between. Radial distribution R Pj Point P J'' The angular direction θ in the cylindrical coordinate system R J Above. At point P J'' At point O, the radial curvature is directed towards point P. J The sign is changed for the first time. Point P. J'' Located at a distance Location. Distance D J Less than distance D max Point P J'' In the cylindrical coordinate system R, it has a sag coordinate Z. PJ'' .

[0079] For reference point O and arc A 12 Point P inside J Each radial distribution R between Pj Point P J'' Located at reference point O and point P J Between. When starting from reference point O and heading towards point P j At that time, the radial curvature at point P J The sign changes for the first time at the location. Point P is located within the angular sector OP1P2 between angles θ1 and θ2. J'' Each of the components forms a continuous curve.

[0080] The continuous curve is projected 18 onto a plane perpendicular to the normal direction of the first surface at reference point O, based on the normal direction at reference point O. Figure 5 The plane (shown as a dashed line consisting of alternating short and long lines) is non-circular. The plane is defined such that Z is constant for any point on the plane.

[0081] Determine the optimal fitting portion circle 20 relative to the non-circular projected continuous curve 18. Preferably, the center of the optimal fitting portion circle 20 is at least 4 mm away from the projection of the reference point O.

[0082] The projection point P J'' Overall, the average interval between the best-fit circle 20 and the circle is greater than 1 mm.

[0083] Virtual Point Q J It is a radial distribution R Pj Part of the OP J'' From point P J'' Start at a distance of D J Extrapolation on, wherein the virtual point Q J In the cylindrical coordinate system R, it has a sag coordinate Z. Qj .

[0084] Figure 6 This disclosure illustrates the radial distribution R of ophthalmic lenses according to this disclosure. Pj The arrow The changes. Figure 6 It also demonstrates the radial distribution R Pj At point P J'' If no inflection point appears at point P, then... J'' Q at the appointed time J The virtual change in curvature.

[0085] When the wearer is myopic, the ophthalmic lens has a negative mean optical power at reference point O, considering the following ratio constraints:

[0086] Preferably, the ratio is less than 0.8.

[0087] When the wearer is hyperopic, the ophthalmic lens has a positive mean optical power at reference point O, considering the following ratio constraints:

[0088] Preferably, the ratio is higher than 1.2.

[0089] In another specific embodiment, the first surface 12 of the ophthalmic lens 1 is the surface of the lens that is furthest from the eye under wearing conditions.

[0090] Arc A 12 Point P J In the cylindrical coordinate system R, it has a sag coordinate Z. Pj radial distribution R Pj Point P J'' ( Figure 5 Located between reference point O and point P J' Between. Radial distribution R Pj Point P J'' The angular direction θ in the cylindrical coordinate system R J Above. At point P J'' At point O, the radial curvature is directed towards point P. J The sign is changed for the first time. Point P. J'' Located at a distance Location. Distance D J Less than distance D max Point P J'' In the cylindrical coordinate system R, it has a sag coordinate Z. PJ'' .

[0091] For reference point O and arc A 12 Point P inside J Each radial distribution R between Pj Point P J'' Located at reference point O and point P J Between. When starting from reference point O and heading towards point P j At that time, the radial curvature at point P J The sign changes for the first time at the location. Point P is located within the angular sector OP1P2 between angles θ1 and θ2. J'' Each of the components forms a continuous curve.

[0092] The continuous curve is projected 18 onto a plane perpendicular to the normal direction of the first surface at reference point O, based on the normal direction at reference point O. Figure 5 The plane (shown as a dashed line consisting of alternating short and long lines) is non-circular. The plane is defined such that Z is constant for any point on the plane.

[0093] Determine the optimal fitting portion circle 20 relative to the non-circular projected continuous curve 18. Preferably, the center of the optimal fitting portion circle 20 is at least 4 mm away from the projection of the reference point O.

[0094] The projection point P J'' Overall, the average interval between the best-fit circle 20 and the circle is greater than 1 mm.

[0095] Virtual Point Q J It is a radial distribution R Pj Part of the OP J'' From point P J'' Start at a distance of D J Extrapolation on, wherein the virtual point Q J In the cylindrical coordinate system R, it has a sag coordinate Z. Qj .

[0096] Figure 6 This disclosure illustrates the radial distribution R of ophthalmic lenses according to this disclosure. Pj The arrow The changes. Figure 6 It also demonstrates the radial distribution R Pj At point P J'' If no inflection point appears at point P, then... J'' Q at the appointed time J The virtual change in curvature.

[0097] When the wearer is myopic, the ophthalmic lens has a negative mean optical power at reference point O, considering the following ratio constraints:

[0098] Preferably, the ratio is higher than 1.2.

[0099] When the wearer is hyperopic, the ophthalmic lens has a positive mean optical power at reference point O, considering the following ratio constraints:

[0100] Preferably, the ratio is less than 0.8.

[0101] In this embodiment, the ophthalmic lens 1 is a progressive multifocal lens, and the reference point O is a distance vision reference point.

[0102] In this embodiment, the average optical power at reference point O has an absolute value greater than 2 D.

[0103] Furthermore, this disclosure relates to an ophthalmic lens 1, which includes at least one optical element disposed between a first surface and a second surface. For example, the at least one optical element generates an optical signal toward the wearer's eye to stop myopia.

[0104] The at least one optical element may be multiple optical elements.

[0105] The plurality of optical elements are arranged on an annular region centered on a reference point O of the lens element and having an inner diameter of 8 mm and an outer diameter of 17 mm. The surface of the annular region having an additional optical power with an absolute value greater than or equal to 7.5 D relative to the reference point O (e.g., the optical center) of the lens element accounts for a ratio of greater than or equal to 0.02, for example greater than or equal to 0.05, for example greater than or equal to 0.09 and less than or equal to 0.5, for example less than or equal to 0.3.

[0106] Furthermore, this disclosure also relates to an eyewear device comprising at least one ophthalmic lens according to the foregoing disclosure.

[0107] The disclosure has been described above with the aid of examples, but does not limit the general inventive concept.

[0108] Many further modifications and variations will be made by those skilled in the art upon reference to the illustrative embodiments described above. These illustrative embodiments are given by way of example only and are not intended to limit the scope of this disclosure, which is determined solely by the appended claims.

[0109] In the claims, the word "comprising" does not exclude other elements or steps, and the indefinite articles "a" or "an" do not exclude a plural. The mere fact that different features are described in mutually different dependent claims does not imply that combinations of these features cannot be used advantageously. Any reference numerals in the claims should not be construed as limiting the scope of this disclosure.

Claims

1. An ophthalmic lens for correcting visual impairment in a wearer's eye, the ophthalmic lens comprising a first surface and a second surface, each of the first surface and the second surface having a profile adapted to allow the lens to be mounted in an eyeglass frame, and wherein, when the lens is mounted in the eyeglass frame and in a wearing condition, a reference point O of the first surface of the ophthalmic lens is positioned in front of the pupil of the wearer's eye, the first surface profile comprising an arc A having a first endpoint P1 and a second endpoint P2. 12 The radial distribution R of the first surface at point Pi on the contour of the first surface Pi It is obtained by intersecting with a plane, said plane including the normal direction Z of the first surface at the reference point O and passing through the point P. I , Its features are, For arc A 12 At least one point P J The first surface at the reference point O and the point P J Between including point P J Point P, spaced 1 mm apart J' radial distribution R Pj The radial curvature it possesses from point P J' The distance D toward the reference point O is less than or equal to 14 mm. max Change the sign at least once. And for the first surface contour in the arc A 12 Any point P other than K The first side is in O and P K Between including P K Point P, spaced 1 mm apart K' radial distribution R Pk The radial curvature it possesses in O and P K' The sign remains unchanged between them.

2. The ophthalmic lens according to claim 1, wherein, The reference point O on the first surface of the ophthalmic lens is the optical center of the lens, or a distance vision reference point, or a fitting cross.

3. The ophthalmic lens according to claim 1 or 2, wherein, The sign change of the radial curvature within the arc A12 has an angular sector of less than or equal to 120° and greater than or equal to 10° located on the temporal side of the ophthalmic lens.

4. The ophthalmic lens according to any one of the preceding claims, wherein, In the arc A 12 any point P J At the location where the first surface is at the reference point O and the point P J Between including point P J Point P, spaced 1 mm apart J' radial distribution R Pj The radial curvature it possesses from point P J' The distance D toward the reference point O is less than or equal to 14 mm. max The sign must be changed at least once.

5. The ophthalmic lens according to any one of the preceding claims, wherein, The first endpoint P1 has an azimuth coordinate θ1 in the cylindrical coordinate system R on the first surface, with the origin at the reference point O, and the second endpoint P2 has an azimuth coordinate θ2 in the cylindrical coordinate system R.

6. The ophthalmic lens according to any one of claims 1 to 5, wherein, Under wearing conditions, the arc A 12 It is positioned on the temporal side of the ophthalmic lens.

7. The ophthalmic lens according to any one of claims 1 to 7, wherein, The distance D max Less than 9 mm, preferably less than 6.5 mm.

8. The ophthalmic lens according to any one of claims 4 to 7, wherein, For each radial distribution R Pj In the arc A 12 Point P within J Between the reference point O and point P J'' Located at point P, starting from the reference point O. J When the radial curvature first changes the position of its sign, the point P J'' Each of the components forms a continuous curve. The projection of the continuous curve onto a plane perpendicular to the normal direction Z at the reference point O is non-circular.

9. The ophthalmic lens according to any one of claims 1 to 8, wherein, The first surface of the ophthalmic lens is the surface of the lens that is closest to the eye when worn.

10. The ophthalmic lens according to any one of claims 9, wherein, Arc A 12 Point P J The cylindrical coordinate system R has a vector coordinate Z. Pj The radial distribution R Pj Point P J'' At the reference point O and the point P J' The radial curvature lies between the reference point O and the point P. J The first change of the symbol's position, and its location relative to the stated point P. J' Distance D max At a small distance Dj, and having a sag coordinate Z in the cylindrical coordinate system R. Pj'' , Virtual Point Q J It is the radial distribution R Pj Part of the OP J'' Starting from point Pj'' at distance D J Extrapolation on, wherein the virtual point Q J The cylindrical coordinate system R has a vector coordinate Z. Qj , The characteristic is that, when the ophthalmic lens has a negative average optical power at the reference point O, Preferably less than 0.8, and provided that the ophthalmic lens has a positive average optical power at the reference point O. Preferably, it is greater than 1.

2.

11. The ophthalmic lens according to any one of claims 1 to 8, wherein, The first surface of the ophthalmic lens is the surface of the lens that is furthest from the eye when worn.

12. The ophthalmic lens according to claim 11, wherein, Arc A 12 Point P J The cylindrical coordinate system R has a vector coordinate Z. Pj The radial distribution R Pj Point P J'' At the reference point O and the point P J' The radial curvature lies between the reference point O and the point P. J The first change of the symbol's position, and its location relative to the stated point P. J' The distance D max Small distance D J It is located at [location] and has a vector coordinate Z in the cylindrical coordinate system R. Pj'' Virtual point Q J It is the radial distribution R Pj Part of the OP J'' From the point P J'' Start at the distance D J Extrapolation on, wherein the virtual point Q J The cylindrical coordinate system R has a vector coordinate Z. Qj The feature is that, when the ophthalmic lens has a negative average optical power at the reference point O, Preferably greater than 1.2, and provided that the ophthalmic lens has a positive average optical power at the reference point O. Preferably, it is less than 0.

8.

13. The ophthalmic lens according to any one of claims 1 to 12, wherein, The ophthalmic lens is a progressive multifocal lens, and the reference point O is a distance vision reference point.

14. The ophthalmic lens according to any one of claims 1 to 14, wherein, The average optical power at the reference point O has an absolute value greater than 2 D.

15. The ophthalmic lens according to any one of the preceding claims, wherein, The ophthalmic lens further includes at least one optical element disposed between the first surface and the second surface, wherein the optical element generates a myopia-stopping optical signal toward the wearer's eye.

16. An eyewear comprising at least one ophthalmic lens according to any one of the preceding claims.

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