Ophthalmic lenses and related methods

Abstract

An ophthalmic lens (101), a method for manufacturing such a lens (101), and a method for designing such a lens (101) are disclosed. The lens (101) has an optic zone (103) centered on an optical axis (102) and a peripheral zone (105) surrounding the optic zone (103). The lens (101) has a first radially curved refractive power profile that varies continuously in a first radial direction along a first meridian (107a) within the optic zone (103) from the optical axis (102) to the peripheral zone (105). The lens has a second radially curved refractive power profile, different from the first, that varies continuously in a second radial direction along a second meridian (107b) different from the first meridian.

Description

[Technical Field]

[0001] The present disclosure relates particularly, but not exclusively, to ophthalmic lenses (hereinafter sometimes referred to simply as "lenses") that can slow the progression of myopia and be used by people with presbyopia, as well as to methods for manufacturing and designing such lenses. [Background technology]

[0002] Many people, including children and adults, need ophthalmic lenses to correct myopia (a condition in which infinitely distant light rays are focused in front of the retina), and many adults may need ophthalmic lenses to correct presbyopia (an age-related loss of accommodation and therefore the inability to focus on nearby objects). Ophthalmic lenses may also be needed to correct hyperopia (a condition in which infinitely distant light rays are focused behind the retina), astigmatism, or keratoconus (a condition in which the cornea gradually bulges and assumes the shape of a cone).

[0003] Without optical correction, myopia focuses incoming light from distant objects to a location in front of the retina. As a result, the light converges toward a plane located in front of the retina (beyond which light diverges) and then diverges toward the retina, causing it to be out of focus upon reaching the retina. Conventional lenses for correcting myopia (e.g., spectacle lenses or contact lenses) reduce the convergence (in the case of contact lenses) or cause divergence (in the case of spectacle lenses) of incoming light from distant objects before it reaches the eye, resulting in the position of the focal point being shifted onto the retina.

[0004] In presbyopia, the lens does not change shape as effectively to accommodate near objects, and therefore people with presbyopia are unable to focus on near objects. Conventional lenses (e.g., eyeglass lenses and contact lenses) for correcting presbyopia include bifocal or cumulative multifocal lenses that include an area optimized for near vision and an area optimized for far vision. Presbyopia may also be treated with bifocal or cumulative multifocal lenses, or monovision lenses (where a different prescription is provided for each eye, with one eye provided with a distance vision lens and the other with a near vision lens).

[0005] Decades ago, it was suggested that undercorrection, i.e., moving the focal point closer to the retina but not completely onto it, could be used to slow or prevent the progression of myopia in children or young people. However, a corollary of this approach is a decrease in distance vision compared to that achieved with lenses that fully correct myopia. Furthermore, the effectiveness of undercorrection in controlling myopia during progression is now considered questionable. A more recent approach is to provide lenses that have both areas that provide full correction of distance vision and areas that are undercorrected or intentionally induce myopic defocus. Lenses may also be provided that increase the scattering of light in certain areas compared to light that passes through the fully corrected areas of the lens. It has been suggested that these approaches can prevent or slow the progression or progression of myopia in children or young people while still providing good distance vision.

[0006] In lenses with defocusing zones, the zones that provide full correction of distance vision are commonly referred to as base power zones (power, also known as refractive power or optical power, and these terms may be used interchangeably herein), while the zones that provide undercorrection or intentionally induce myopic defocus are commonly referred to as myopic defocus zones or add zones (because the power, expressed in diopters, is slightly more positive (+) or slightly less positive (-) than the power of the distance-correcting base power zone). The surface (typically the anterior surface) of the add zone has a smaller radius of curvature than that of the distance zone, thus providing a slightly more positive or slightly more negative power to the eye. The add zone is designed to focus incoming parallel light rays (i.e., light from far away) in the eye in front of the retina (i.e., located near the lens), while the distance zone is designed to focus light so that it can form an image at the retina (i.e., away from the lens). When the lens wearer is using accommodation to focus light that has passed through the distance power region while viewing a near target, the add power region focuses the light in front of the retina.

[0007] One known type of contact lens that reduces the progression of myopia is a dual-focus contact lens, commercially available under the name MISIGHT (CooperVision, Inc.). This dual-focus lens differs from bifocal or multifocal contact lenses designed to improve vision in presbyopia in that the dual-focus lens has certain optical dimensions that allow individuals with accommodation to use distance correction (i.e., base power) to see both distant and near objects. The treatment zone of the dual-focus lens, which also has add power, provides myopically defocused images at both distance and near vision distances.

[0008] While these lenses have proven beneficial in preventing or slowing the progression of myopia, the annular add power area can produce undesirable visual side effects. Light focused by the annular add power area in front of the retina diverges from the focal point, forming a defocused annulus at the retina. Thus, wearers of these lenses may see a ring or "halo" surrounding the image formed on the retina, particularly for small, shiny objects, such as street lamps or car headlights. Furthermore, theoretically, rather than using the eye's natural accommodation (i.e., the eye's natural ability to change focal length) to focus on nearby objects, the wearer may utilize the additional annular add power area to focus on nearby objects. In other words, the wearer may accidentally use the lenses in the same manner as presbyopia-correcting lenses, which is undesirable for younger subjects.

[0009] Other lenses have been developed that can be used in the treatment of myopia. In these lenses, the annular region is configured to prevent a single, on-axis image from appearing in front of the retina, thereby preventing such an image from being used to focus on a nearby target and avoid the need for accommodation. Alternatively, a distant point source of light is imaged by the annular region into a ring-shaped focal line at the nearby add focal plane, thereby producing a small spot size of light without a surrounding "halo" effect on the retina at the far focal plane. Summary of the Invention [Problem to be solved by the invention]

[0010] It has been recognized that for treating myopia, it may be beneficial to provide a lens that introduces additional myopic defocus. For treating presbyopia, it may be beneficial to provide a lens that produces an extended depth of focus. The present disclosure seeks to provide such a lens. Such lenses may also be useful in correcting or improving vision associated with hyperopia, astigmatism, keratoconus, or other refractive errors. [Means for solving the problem]

[0011] According to a first aspect, the present disclosure provides an ophthalmic lens as set forth in claim 1.

[0012] According to a second aspect, the present disclosure relates to a method for manufacturing a lens as set forth in claim 23.

[0013] According to a second aspect, the present disclosure relates to a method for designing a lens as set forth in claim 24.

[0014] Of course, it will be recognized that features described in connection with one aspect of the present disclosure may be incorporated into other aspects of the present disclosure, for example, a method of the present disclosure may incorporate features described in connection with a device or apparatus of the present disclosure, and vice versa.

[0015] Embodiments of the present invention will now be described, by way of example only, with reference to the accompanying schematic drawings in which: [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a diagram illustrating how to orient meridians relative to a lens. [Figure 2A] FIG. 1 is a schematic plan view of a lens according to an embodiment of the present disclosure. [Figure 2B] 2B is a plot showing radial curvature power along two different meridians of FIG. 2A. FIG. [Figure 3A] FIG. 2 is a schematic plan view of a lens according to another embodiment of the present invention. [Figure 3B] 3B is a plot showing radial curvature power along two different meridians of FIG. 3A. FIG. [Figure 4A] FIG. 2 is a schematic plan view of a lens according to another embodiment of the present disclosure. [Figure 4B] FIG. 4B is a plot showing radial curvature power along two different meridians of FIG. 4A. [Figure 5A]FIG. 2 is a schematic plan view of a lens according to another embodiment of the present disclosure. [Figure 5B] FIG. 5B is a plot showing radial curvature power along two different meridians of FIG. 5A. [Figure 6A] FIG. 2 is a schematic plan view of a lens according to another embodiment of the present disclosure. [Figure 6B] FIG. 6B is a plot showing radial curvature power along two different meridians of FIG. 6A. [Figure 7A] FIG. 2 is a schematic plan view of a lens according to another embodiment of the present disclosure. [Figure 7B] FIG. 7B is a plot showing radial curvature power along two different meridians of FIG. 7A. [Figure 8] 1 is a flow chart illustrating a method of manufacturing a lens according to one embodiment of the present disclosure. [Figure 9] 1 is a flow diagram illustrating a method for designing a lens according to one embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0017] According to a first aspect, the present disclosure provides an ophthalmic lens having an optic zone centered on an optical axis and a peripheral zone surrounding the optic zone. Within the optic zone, the lens has a first radial curvature power profile that varies continuously in a first radial direction from the optical axis to the peripheral zone along a first meridian. The lens has a second, different radial curvature power profile that varies continuously in a second radial direction from the optical axis to the peripheral zone along a second meridian different from the first meridian.

[0018] The ophthalmic lens may be a spectacle lens. The ophthalmic lens may be a contact lens.

[0019] The spectacle lenses may be made of PMMA, CR-39, polycarbonate, Trivex, or crown glass.

[0020] As used herein, the term contact lens refers to an ophthalmic lens that can be placed on the anterior surface of the eye. It will be appreciated that such contact lenses allow clinically acceptable on-eye movement and do not adhere to one or both of a person's eyes. The ophthalmic lens may be a corneal lens (i.e., a contact lens that rests on the cornea of ​​the eye). The ophthalmic lens may be a soft contact lens, such as a hydrogel contact lens or a silicone hydrogel contact lens. The contact lens may also be a rigid (or hard) contact lens.

[0021] The ophthalmic lens may be a lens used in preventing or slowing the progression or worsening of myopia. The lens may be a lens used in providing extended focal depth to presbyopia.

[0022] The ophthalmic lenses of the present disclosure have an optic zone. The optic zone includes portions of the lens that perform an optical function. The optic zone is configured to be placed over the pupil of the eye during use. For the ophthalmic lenses of the present disclosure, the optic zone has a small-diameter central region and an annular region surrounding the central region.

[0023] The ophthalmic lens of the present disclosure includes a peripheral zone surrounding the optic zone. The peripheral zone is not part of the optic zone but surrounds the optic zone, and the peripheral zone is located outside the optic zone. For embodiments of the present disclosure in which the ophthalmic lens is a contact lens, the peripheral zone is located above the iris when the lens is worn and performs mechanical functions, such as increasing the size of the lens and thereby making it easier to handle, providing stabilization to prevent lens rotation, and / or providing a contoured area to improve comfort for the lens wearer. The peripheral zone may extend to the edge of the contact lens. The peripheral zone may have a substantially circular periphery. For embodiments of the present disclosure in which the ophthalmic lens is a spectacle lens, the peripheral zone surrounds the optic zone and is located outside the optic zone. The peripheral zone may have a substantially circular periphery. The peripheral zone may have a substantially elliptical, oval, or rectangular periphery. The peripheral zone may extend to the edge of the spectacle lens. The peripheral zone may be surrounded by another lens that is not optically active.

[0024] For embodiments of the present disclosure in which the ophthalmic lens is a contact lens, the peripheral zone may include a ballast for orienting the lens when placed on a wearer's eye. Embodiments of the present disclosure incorporating a ballast into a contact lens rotate to a predetermined angle of repose under the influence of the wearer's eyelid when placed on the wearer's eye; for example, the ballast may be a wedge, and the rotation may occur due to the action of the eyelid on the wedge. Stabilizing contact lenses to orient contact lenses is well known in the art; for example, toric contact lenses are stabilized to orient such lenses so that the orthogonal cylindrical correction provided by the lens is precisely aligned with the astigmatism of the wearer's eye.

[0025] For embodiments of the present disclosure in which the ophthalmic lens is a spectacle lens, the lens may be substantially circular in shape. The lens may be elliptical in shape. The lens may be oval in shape. The lens may be rectangular in shape. The lens may be square in shape. The anterior surface of the lens may be 1200mm 2 ~3000mm 2 It is preferable that the area of ​​the substrate is 0.1 mm.

[0026] In embodiments of the present disclosure where the ophthalmic is a contact lens, the lens may be substantially circular in shape and may have a diameter of from about 4 mm to about 20 mm.

[0027] The optic zone of an ophthalmic lens may be substantially circular in shape and may have a diameter of from about 2 mm to about 10 mm.

[0028] For embodiments of the present disclosure in which the ophthalmic lens is a contact lens, the contact lens may have a diameter of 13 mm to 15 mm and the optic zone may have a diameter of 7 mm to 9 mm.

[0029] The optical axis of a lens is determined relative to a distant point light source. Light from a distant point light source located on the optical axis of the lens (hereinafter sometimes referred to as an on-axis distant point light source) is focused on the optical axis of the lens. The optical axis is preferably located along the center line of the lens. For example, if the lens is a contact lens, the optical axis is generally located along the center line of the lens. However, the optical axis may not naturally be located along the center line of the lens, as is the case with spectacle lenses, where the position of the lens's optical axis is determined by the wearer's interpupillary distance, and the lens optical axis may not coincide with the center line of the lens depending on the lens's geometric shape.

[0030] The refractive power (power) of the lens within the optic zone can be defined as radial curvature power, circumferential curvature power, radial sagittal power, and circumferential sagittal power.

[0031] In ophthalmology, the term "sagittal" is used in two different ways: to describe oblique astigmatism and optical surfaces.

[0032] In general optical systems, the term "sagittal" is used to describe oblique astigmatism. Oblique astigmatism occurs when light rays from an off-axis location pass through a lens at an angle. Astigmatism is often due to cosine compression of the meridian from which the light rays are coming; for example, if the light rays are coming from the horizontal peripheral field, the surface (and thus the radius of curvature) will appear cosine compressed when viewed horizontally, resulting in a larger power (and thus astigmatism) in that meridian. The power in that meridian is labeled "tangential" power, and the power in the vertical meridian is labeled "sagittal" power. Astigmatism results in an object point being imaged into two spatially separated and orthogonal line foci: a sagittal focal line and a tangential focal line.

[0033] A second use of the term "sagittal" comes from describing optical surfaces, for example, in ophthalmology, where sagittal is important for clinical measurements of the anterior ocular surface (i.e., in corneal topography). Sagittal optical power is determined by the slope of the optical surface along a given direction, also referred to as slope-based power. Terms including "sagittal power," "slope power," and "axial power" are synonyms that can be used interchangeably. Curvature power is determined by the local curvature of the optical surface along a given direction.

[0034] In this disclosure, the terms sagittal and curvature power may be used in relation to optical surfaces to describe the refractive power of the surfaces of an ophthalmic lens.

[0035] Both sagittal and curvature powers are defined by a given direction. For ophthalmic lenses according to embodiments of the present disclosure, radial curvature power is along a direction extending radially outward from the optical axis of the lens. Circumferential sagittal and curvature powers are along a direction perpendicular to the radial direction.

[0036] For lenses with coaxial optics, the values ​​of sagittal power and curvature power should be nearly equal or identical in the paraxial approximation. However, the values ​​of slope power and curvature power can be quite different for some recently developed myopia-correcting lenses employing coaxial optics. These lenses have surface areas that focus light from an on-axis source onto an area off the optical axis, and as a result, the distance at which a local ray bundle from the source reaches the focal point can be quite different from the distance at which the local ray bundle intersects the optical axis. For these types of lenses, the difference between sagittal power and curvature power becomes important. In non-coaxial optics, a description of curvature power does not provide a complete description of the optical system. Adjacent regions of a lens have the same curvature power but do not have the same sagittal power (because light rays from each region intersect the optical axis at distances that are different from the local focal length and different from each other). For lenses including non-coaxial lenslets, for example, the resulting sagittal and curvature power values ​​are significantly different: the curvature power map of such a lens shows constant add power for each lenslet, while the sagittal power map shows decreasing sagittal power with increasing radial distance.

[0037] Sagittal power is directly related to the ray location at the image plane (retinal plane in the eye) and therefore directly linked to image quality, which is not necessarily the case for curvature power when non-coaxial optical systems are realized.

[0038] The sagittal and curvature powers of an ophthalmic lens can be determined by measuring the wavefront of light passing through the lens. In describing the optical wavefront passing through the lens, the radial sagittal power of the lens at a given location is related to the first derivative of the wavefront, since this radial sagittal power is calculated as the slope of the wavefront divided by the radial distance (r) from the optical axis of the lens (typically the center of the lens). The radial (local) curvature power at that location is calculated as the second derivative of the wavefront.

[0039] In practice, an exemplary approach for measuring the wavefront of light passing through an ophthalmic lens is to use a wavefront aberrometer, such as a Shack-Hartmann wavefront aberrometer equipped with a 540 nm (monochrome, i.e., narrowband) light source, e.g., ClearWave® ( www.lumetrics.com ) available from ). A Shack-Hartmann wavefront aberrometer contains a planar regular array of small lenses. In use, the wavefront to be measured is sampled by a two-dimensional array of small lenses, each of which focuses a different portion of the wavefront to a different focal point. When the wavefront is planar, the spatial arrangement of the resulting point spread function mirrors the arrangement of the lenses, which therefore focus the wavefront to a corresponding regular array of focal points.

[0040] Aberrometer-based measurements of an optical wavefront are quantified relative to a standard reference case. For example, when a Shack-Hartmann aberrometer is used, the standard reference is typically a planar wavefront passed through a two-dimensional array of lenslets (lenslets) as just described.

[0041] The effect of a given lens on a wavefront is measured by inserting the lens into the measurement path at a location optically paired with a lenslet array. The planar wavefront is then passed through the two-dimensional array of lenslets and then through the lens.

[0042] In the case of a simple lens, the resulting wavefront is either a diverging or converging wavefront, which produces an array of points that are displaced relative to their positions when no lens is used. In practice, the magnitude and direction of the point displacement may also result from additional aberrations in the lens. A wavefront error map is determined by measuring the displacement of the points from a regular array of focal points, and the wavefront error map may be used to calculate the sagittal and curvature power of the lens.

[0043] The wavefront error map may be measured across the lens, for example across the optical zone of a contact lens; for example, using a Shack-Hartmann wavefront aberrometer, a wavefront error map may be measured every 104 μm across a 10 mm aperture.

[0044] For lenses according to embodiments of the present disclosure described herein, the radial-sagittal power (e.g., slope power or axial power) at a given location is the first derivative with respect to r of the wavefront error (i.e., the wavefront error slope, which may be obtained, for example, from a wavefront error map) divided by r, where r is the radial distance of that location from the optical axis of the lens; thus, the radial-sagittal power is defined as: JPEG2025527788000002.jpg15150

[0045] For lenses according to embodiments of the present disclosure described herein, the radial curvature refractive power at a given location is the second derivative with respect to r of the wavefront error (i.e., the wavefront error slope, which may be obtained, for example, from a wavefront error map) divided by r, where r is the radial distance of that location from the optical axis of the lens; thus, the radial curvature refractive power is defined as: JPEG2025527788000003.jpg15150

[0046] The term meridian (sometimes called a meridian) is used herein to refer to a line within the optical zone that extends radially outward from the optical axis to a point on the boundary between the optical zone and the peripheral zone. The direction of a meridian around the optical zone can be defined by an angle θ, which can vary from 0° to 360°. This is illustrated in FIG. 1. FIG. 1 shows a lens 1 having an optical zone 3 centered on the optical axis 20. A peripheral zone 5 surrounds the optical zone. A first exemplary meridian 7a lies along the line θ=0° / 360° and extends from the optical axis 2 to the boundary 9 between the optical zone 3 and the peripheral zone 5. A second exemplary meridian 7b lies along the line θ=90° and extends from the optical axis 2 to the boundary 9 between the optical zone 3 and the peripheral zone 5. A third example meridian 7c lies along the line θ=180° and extends from the optical axis 2 to the boundary 9 between the optical zone 3 and the peripheral zone 5. A fourth example meridian 7d lies along the line θ=270° and extends from the optical axis 2 to the boundary 9 between the optical zone 3 and the peripheral zone 5. Although only four mutually orthogonal lines are shown in FIG. 1, meridians lie along all values ​​of θ, i.e., 0°≦θ<360°. Additionally, the angles of each meridian are relative to the accompanying drawings. It should be appreciated that in the field of contact lenses, for example, the 90° meridian shown in FIG. 1 can actually be understood to be a 0° / 360° meridian, and the 0° / 360° meridian shown in FIG. 1 can also be understood to be a 90° meridian, with the angles of each meridian increasing in a counterclockwise direction.

[0047] In embodiments of the present disclosure, the radial curvature power of the optic zone varies continuously (i.e., smoothly and continuously) in a radial direction along a first meridian (i.e., extending radially outward from the optical axis of the lens to a point at the boundary between the optic and peripheral zones), resulting in a first radial curvature-power profile. A first mean radial curvature power can be defined as the mean radial curvature power value measured along the meridian having the first radial curvature-power profile.

[0048] The first radially curved power profile can provide a distance power at or near the optical axis. At the optical axis, the first radially curved power profile can provide a power from +0.5 diopters (D) to -25.0 D. At the optical axis, the first radially curved power profile can provide a power from -0.25 D to -15.0 D. Alternatively, the first radially curved power profile can provide a near power. At the optical axis, the first radially curved power profile can provide a power from +0.5 diopters (D) to +25.0 D. At the optical axis, the first radially curved power profile can provide a power from +0.5 diopters (D) to +10.0 D.

[0049] In embodiments of the present disclosure, the radial curvature power along at least a second meridian (i.e., a second radial direction extending outward from the optical axis of the lens to a point on the boundary between the optical zone and the peripheral zone) different from the first also varies continuously (i.e., smoothly and continuously) but exhibits a different change in radial curvature power to the first curvature-power profile, thereby resulting in a second different radial curvature-power profile. The second mean radial curvature power can be defined as the mean radial curvature-power value taken along the meridian having the second radial curvature-power profile. The second mean radial curvature power can be identical to the first mean radial curvature power. The second mean radial curvature power can be the same as the first mean radial curvature power.

[0050] Advantageously, lenses according to embodiments of the present disclosure having different curvature power profiles along different meridians can allow for relaxation of the eye muscles, which may be particularly useful in lenses intended to improve vision at everyday working distances, which may have an anti-fatigue effect.

[0051] The second radially curved power profile can provide distance power at or near the optical axis. At the optical axis, the second radially curved power profile can provide a power of +0.5 diopters (D) to -25.0 D. At the optical axis, the second radially curved power profile can provide a power of -0.25 D to -15.0 D. Alternatively, the second radially curved power profile can provide near power. At the optical axis, the second radially curved power profile can provide a power of +0.5 diopters (D) to +25.0 D. At the optical axis, the second radially curved power profile can provide a power of +0.5 diopters (D) to +10.0 D.

[0052] At the optical axis, the second radial curvature-power profile may have the same radial curvature power as the first radial curvature-power profile. Alternatively, the first and second radial curvature-power profiles may be approximately equal to two different radial curvature-power values. Off the optical axis, the first or second curvature-power profile may provide a circular power, and the other of the first and second curvature-power profiles may provide a near power. Advantageously, the lens can thus provide both a central near power and a central distance power.

[0053] The first and second radial curvature-power profiles can have the same or nearly the same radial curvature-power values ​​at or near the optical axis, but different radial curvature-power values ​​at or near the boundary between the optical zone and the peripheral zone. Alternatively, the first and second radial curvature-power profiles can have different radial curvature-power values ​​at or near the optical axis, and the same or nearly the same radial curvature-power values ​​at or near the boundary between the optical zone and the peripheral zone.

[0054] The radial curvature power may vary (periodically vary) along the first radial curvature power profile in an oscillating manner. Along the first radial curvature power, the radial curvature power may increase or decrease continuously. The first radial curvature power profile may exhibit a monotonic decrease in radial curvature power with a monotonic increase in radial distance from the optical axis, or a monotonic increase in radial curvature power with a monotonic increase in radial distance from the optical axis. The slope of the first radial curvature power profile may be constant or may vary with an increase in radial distance from the optical axis. Along the first radial curvature power profile, the radial curvature power may vary in a quasi-random manner.

[0055] The radial curvature power may vary periodically along the second radial curvature power profile. The radial curvature power may increase or decrease continuously along the second radial curvature power profile. The second radial curvature power profile may exhibit a monotonic decrease in radial curvature power with a monotonic increase in radial distance from the optical axis, or a monotonic increase in radial curvature power with a monotonic increase in radial distance from the optical axis. The slope of the second radial curvature power profile may be constant or may vary with an increase in radial distance from the optical axis. The radial curvature power may vary in a quasi-random manner along the second radial curvature power profile.

[0056] The first radial curvature-power profile can be selected to produce a desired first mean radial curvature-power value along a first meridian, and the second radial curvature-power profile can be selected to produce a desired second mean radial curvature-power value along a second meridian.

[0057] The first radial curvature-power profile may have substantially the same shape as the second radial curvature-power profile, but the first mean radial curvature-power may be different from the second mean radial curvature-power. Alternatively, the first curvature-power profile may have a first mean radial curvature-power value measured along a first meridian, and the second radial curvature-power profile may also have a first mean radial curvature-power value measured along a second meridian, and the first radial curvature-power may have a different shape from the second radial curvature-power profile.

[0058] The first radially curved-power profile may have an inverse shape to the second radially curved-power profile. For example, one of the first and second curved-power profiles may have at least one peak at a first radial distance from the optical axis of the lens, and the other of the first and second curved-power profiles may have at least one valley at a first radial distance from the optical axis of the lens. The first radially curved-power profile may have a series of peaks at a series of radial positions along a meridian, while the second radially curved-power profile may have a series of valleys at the same radial positions along the meridian. In this case, the first mean radially curved power may be the same as the second mean radially curved power or may be different from the second mean radially curved power. In this case, the term peak may be used herein to refer to the maximum (i.e., the absolute maximum positive or negative) radial curvature-power value along the radial curvature-power profile. A peak may be a global peak, i.e., having the absolute maximum radial curvature-power value along the radial curvature-power profile, or a local peak, i.e., having the maximum radial curvature-power value compared to the radial curvature-powers on each side of the peak. The term trough may be used herein to refer to the minimum (i.e., the absolute minimum positive or negative) radial curvature-power value along the radial curvature-power profile. A peak may be a global valley, i.e., having the absolute maximum radial curvature-power value along the radial curvature-power profile, or a local valley, i.e., having the minimum radial curvature-power value compared to the radial curvature-powers on each side of the valley.

[0059] One of the first radial curvature-power profile and the second radial curvature-power profile may have a larger (i.e., larger positive or negative in absolute value) curvature-power value closer to the optical axis than to the boundary between the peripheral zone and the optical zone, and the other of the first radial curvature-power profile and the second radial curvature-power profile may have a smaller (i.e., smaller positive or negative in absolute value) curvature-power value closer to the optical axis than to the boundary between the peripheral zone and the optical zone. One of the first radial curvature-power profile and the second radial curvature-power profile may monotonically increase with increasing distance from the optical axis. The other of the first radial curvature-power profile and the second radial curvature-power profile may monotonically decrease with increasing distance from the optical axis.

[0060] The first radially curved-power profile may have at least one peak in radially curved power. The first radially curved-power profile may have at least one valley in radially curved power. The first radially curved-power profile may have multiple peaks and / or multiple valleys in radially curved power at different radial distances from the optical axis of the lens. The different peaks and / or valleys in the first radially curved-power profile may be global or local peaks and / or valleys, i.e., the peaks and valleys may have different radially curved-power values. The second radially curved-power profile may have at least one peak in radially curved power. The second radially curved-power profile may have at least one valley in radially curved power. The second radially curved-power profile may have multiple peaks and / or multiple valleys of radially curved power at different radial distances from the optical axis of the lens. The different peaks and / or valleys in the second radially curved-power profile may be global or local peaks and / or valleys, i.e., the peaks and valleys may have different radially curved-power values.

[0061] At least one peak and / or valley in the first radially curved-power profile may be located at the same radial distance from the optical axis of the lens as at least one peak and / or valley in the second radially curved-power profile. Each peak and / or valley in the first radially curved-power profile may be located at the same radial distance from the optical axis of the lens as each peak and / or valley in the second radially curved-power profile. Each peak in the first radially curved-power profile may be located at the same radial distance from the optical axis of the lens as a valley in the second radially curved-power profile, or vice versa.

[0062] The first radial curvature power profile may span a power range of at least 2.0D, preferably at least 5.0D. The second radial curvature power profile may span a power range of at least 2.0D, preferably at least 5.0D. The first and second radial curvature power profiles may span the same power range, e.g., both the first and second radial curvature power profiles may span a 5.0D power range. The first and second radial curvature power profiles may span different absolute power ranges. The range of power values ​​spanned by the first radial curvature power profile may overlap with the range of power values ​​spanned by the second radial curvature power profile.

[0063] The first radially curved power profile and the second radially curved power profile may have substantially the same shape but may span different power ranges, which may be overlapping or non-overlapping power ranges.

[0064] Within the optical zone, a first set of meridians can have a first curved-power profile and a second set of meridians can have a second curved-power profile. The first curved-power profile can have a first mean radially curved power, and therefore the first set of meridians can have a first mean radially curved power. The second mean radially curved-power profile can have a second mean radially curved-power value, and therefore the second set of meridians can have a second mean radially curved power.

[0065] The first set of meridians may be distributed at regular intervals (i.e., at regularly spaced values ​​of θ) around the optical zone. The angular spacing between each of the first set of meridians may be about 90°, about 45°, about 30°, about 20°, or about 10°. The angular spacing between each of the first set of meridians may be less than 5°, less than 2°, less than 1°, or less than 0.5°. The second set of meridians may be distributed at regular intervals (i.e., at regularly spaced values ​​of θ) around the optical zone. The angular spacing between each of the second set of meridians may be about 90°, about 45°, about 30°, about 20°, or about 10°. The angular spacing between each of the second set of meridians may be less than 5°, less than 2°, less than 1°, or less than 0.5°. The first and second sets of meridians may alternate, and the meridians may form an alternating pattern around the optical zone. The angular spacing between one meridian in the first set and its adjacent meridian in the second set may be less than 5°, less than 2°, less than 1°, or less than 0.5°. The angular spacing between one meridian in the first set and its adjacent meridian in the second set may be so small that the eye of the lens wearer cannot distinguish between the two meridians.

[0066] The mean radial curvature power of the meridians viewed in a first direction can be different from the mean radial curvature power of the meridians viewed in a second, orthogonal direction, resulting in a toric mean power profile. For example, the second set of meridians can be orthogonal to the first set of meridians (i.e., each meridian in the first set having a first mean radial curvature power can be orthogonal to one meridian in the second set having a second mean radial curvature power). As a result, the optical zone of the lens can have a toric power profile.

[0067] A first set of meridians spaced around the optical zone may have a first mean radial curvature power, and a second set of meridians spaced around the optical zone may have a second mean radial curvature power. Alternatively, the second set of meridians having the second mean radial curvature power may form an alternating pattern with the first set of meridians having the second mean radial curvature power. Thus, the first and second sets of meridians may result in a star-shaped power profile with a periodic change in radial curvature power moving circumferentially around the optical zone. The angular separation between one meridian of the first set of meridians having the first mean radial curvature power and an adjacent meridian of the second set of meridians having the second mean radial curvature power may be less than 1°.

[0068] Along at least one other meridian in the optical zone, the radial curvature-power may vary with a third radial curvature-power profile that is different from the second curvature-power profile and the first curvature-power profile.

[0069] The radial curve power profile along the meridians within the optical zone may vary continuously with angle θ. Each meridian along the optical zone may have a peak in the radial curve power at a different radial distance from the optical axis for each meridian. Thus, the location of the peak or valley along each meridian (i.e., the radial distance of the peak or valley from the optical axis of the lens) may vary with angle θ. The location of the peak or valley along the circumference of the optical zone may be part of a spiral, i.e., the radial distance of the peak or valley from the optical axis may increase as angle θ increases, or may decrease as angle θ increases.

[0070] The radially curved refractive power of the optic zone may result from the curvature of the anterior surface of the lens. The radially curved refractive power of the optic zone may result from the curvature of the posterior surface of the lens. The radially curved refractive power of the optic zone may result from the combined curvature of the anterior and posterior surfaces of the lens.

[0071] For embodiments of the present disclosure in which the ophthalmic lens is a contact lens, the lens may be comprised of an elastomeric material, a silicone elastomeric material, a hydrogel material, or a silicone hydrogel material, or a mixture thereof. As understood in the contact lens art, a hydrogel is a material that retains water in equilibrium and is free of silicone-containing chemicals. A silicone hydrogel is a hydrogel that contains silicone-containing chemicals. The hydrogel and silicone hydrogel materials described in the context of the present disclosure have an equilibrium water content (EWC) of at least 10% to about 90% (wt / wt). In some embodiments, the EWC of a hydrogel or silicone hydrogel material is about 30% to about 70% (wt / wt). In comparison, the water content of the silicone elastomeric materials described in the context of the present invention is about 0% to less than 10% (wt / wt). Typically, the water content of the silicone elastomeric materials used in the methods or devices of the present invention is 0.1% to 3% (wt / wt). Examples of suitable lens formulations include those having the following United States Adequate Names (USAN): methafilcon A, ocufilcon A, ocufilcon B, ocufilcon C, ocufilcon D, omafilcon A, omafilcon B, comfilcon A, enfilcon A, stenfilcon A, fanfilcon A, etafilcon A, senofilcon A, senofilcon B, senofilcon C, narafilcon A, narafilcon B, balafilcon A, samfilcon A, lotrafilcon A, lotrafilcon B, somofilcon A, riofilcon ) A, delefilcon A, verofilcon A, kalifilcon A, etc.

[0072] Alternatively, the lens may comprise, consist essentially of, or consist of a silicone elastomer material. For example, the lens may comprise, consist essentially of, or consist of a silicone elastomer material having a Shore A hardness of 3 to 50. Shore A hardness can be determined using conventional methods (e.g., using method DIN 53505), as will be understood by those skilled in the art. Other silicone elastomer materials are available, for example, from NuSil Technology or Dow Chemical Company.

[0073] According to a second aspect, the present disclosure provides a method of manufacturing a lens, which may include any of the features described above in relation to the first aspect of the invention, and which may include the step of forming the lens.

[0074] For embodiments of the present disclosure in which the ophthalmic lens is a contact lens, the manufacturing method may include forming a female mold member with a concave lens-forming surface and a male mold member with a convex lens-forming surface. The method may include filling a gap between the female mold member and the male mold member with bulk lens material. The method may further include curing the bulk lens material to form the lens.

[0075] For embodiments of the present disclosure in which the ophthalmic lens is a contact lens, the lens may be formed using a lathing process. The lens may be formed by cast molding, spin casting, or lathing, or a combination thereof. As will be understood by those skilled in the art, cast molding refers to forming a lens by placing a lens-forming material between a female mold member having a concave lens-forming surface and a male mold member having a convex lens-forming surface.

[0076] According to a third aspect, the present disclosure provides a method for designing a lens. The lens may include any of the features described above. The method includes selecting a first mean radial curvature-power value and selecting a second, different mean radial curvature-power value. The method includes designing a first curvature-power profile that produces the first mean radial curvature-power value and designing a second curvature-power profile that produces the second mean radial curvature-power value. The method includes designing an optic zone of the lens, the optic zone including a meridian having the first curvature-power profile and a meridian having the second curvature-power profile.

[0077] 2A is a schematic plan view according to one embodiment of the present disclosure. Lens 101 has an optic zone 103 centered on optical axis 102 and a peripheral zone 105 surrounding optic zone 103. A first meridian 107a (only one meridian 107a is labeled; the other meridians in the set are shown in dash-dot lines) that is part of a set of first meridians 107a extends from optical axis 102 to a boundary 109 between optic zone 103 and peripheral zone 105. Along first meridian 107a, the radial curvature power varies smoothly and continuously, and this radial curvature power has a first radial curvature-power profile 111a, as shown in FIG. 2B. First radial curvature-power profile 111a oscillates or cycles between peaks 113a and valleys 115a. Both peaks 110a have the same radial curvature-power value, and both valleys 115a have the same radial curvature-power value. A second meridian 107b extends from the optical axis 102 to the boundary 109 between the optic zone 103 and the peripheral zone 105. The second meridian 107b is part of a set of second meridians 107b (only one meridian 107b is labeled, the other meridians in the set are shown in dashed lines), which also have a radial curvature-power that varies smoothly and continuously with a second radial curvature-power profile 111b, as shown in FIG. 2B. The second radially curved-power profile 111b also oscillates or cycles between peaks 113b and valleys 115b, but in an inverse manner to that of the first radially curved-power profile 111a, such that the valleys 115b of the second radially curved-power profile 111b are located at the same radial distance from the optical axis 102 as the peaks 113a of the first radially curved-power profile 111a, and vice versa. The first radially curved-power profile 111a and the second radially curved-power profile 111b have the same average radially curved power, indicated by the dotted line 117.

[0078] As shown in Figure 2A, there is an alternating and periodic pattern of a first set of meridians 107a having a first radially curved power profile 111a (see Figure 2B) and a second set of meridians 107b having a second radially curved power profile 111b (see Figure 2B) around the optical zone 103. The meridians 107a in the first set are angularly spaced approximately 45° from each other, and the meridians 107b in the second set are angularly spaced approximately 45° from each other, resulting in an angular spacing of approximately 22.5° between a meridian 107a in the first set and its neighbor in the second set.

[0079] 3A is a schematic plan view of a lens 201 according to another embodiment of the present disclosure. The lens 201 has an optic zone 203 centered on an optical axis 202 and a peripheral zone 205 surrounding the optic zone 203. A second meridian 207a (only one meridian 207a is labeled, while the other meridians in the set are shown in dash-dot lines) that is part of a set of first meridians 207a extends from the optical axis 202 to a boundary 209 between the optic zone 203 and the peripheral zone 205. Along the first meridian 207a, the radial curvature power varies smoothly and continuously, and has a first radial curvature-power profile 211a, as shown in FIG. 3B. The first curvature-power profile 211a along the first meridian 207a is shown in FIG. 3B. The first radial curve power profile 211a has radial curve power values ​​that decrease with increasing distance from the optical axis 202. The slope of the radial curve power profile 211a changes with distance from the optical axis 202.

[0080] A second meridian 207b extends from the optical axis 202 to the boundary 209 between the optic zone 203 and the peripheral zone 205. Along the second meridian 207b, which is part of a set of second meridians 207b (only one meridian 207b is labeled, the other meridians in the set are shown in dashed lines), the radial curvature power also varies smoothly and continuously, and this radial curvature power has a second radial curvature-power profile 211b, as shown in FIG. 3B. The second radial curvature-power profile 211b has radial curvature-power values ​​that increase with increasing radial distance from the optical axis 202. The slope of the second radial curvature-power changes with distance from the optical axis 202. The second radial curvature-power profile 211b exhibits an inverse variation of the first radial curvature-power profile 211a. The first radial curvature power profile 211 a and the second radial curvature power profile 211 b have the same average radial curvature power, indicated by the dotted line 217 .

[0081] As shown in Figure 3A, there is an alternating and periodic pattern of a first set of meridians 207a having a first radially curved power profile 211a (see Figure 3B) and a second set of meridians 207b having a second radially curved power profile 211b (see Figure 3B) around the optical zone 203. The meridians 207a in the first set are angularly spaced approximately 10° from each other, and the meridians 207b in the second set are angularly spaced approximately 10° from each other, such that the angular spacing between a meridian 207a in the first set and its neighboring meridian 207b in the second set is approximately 5°.

[0082] 4A is a schematic plan view of a lens 301 according to another embodiment of the present disclosure. The lens 301 has an optic zone 303 centered on an optical axis 302 and a peripheral zone 305 surrounding the optic zone 303. A first meridian 307a (only one meridian 307a is labeled, the other meridians in the set are shown in dash-dot lines) that is part of a set of first meridians 307a extends from the optical axis 302 to a boundary 309 between the optic zone 303 and the peripheral zone 305. Along the first meridian 307a, the radial curvature power varies smoothly and continuously, and has a first radial curvature power profile 311a, as shown in FIG. 4B. 4B , a first radial curvature-power profile 311 a along the first meridian 307 a has a radial curvature-power value that decreases with increasing distance from the optical axis 302. The slope of the first radial curvature-power profile 311 a varies with distance from the optical axis 302. A second meridian 307 b extends from the optical axis 302 to the boundary 309 between the optic zone 303 and the peripheral zone 305. Along the second meridian 307 b that is part of a set of second meridians 307 b (only one meridian 307 b is labeled, while the other meridians in the set are shown with dashed lines), the radial curvature-power also varies smoothly and continuously, and has a second radial curvature-power profile 311 b, as shown in FIG. The second curved-power profile 311b along this second meridian 307b also has radial curved-power values ​​that decrease with increasing distance from the optical axis 302.

[0083] At the optical axis 302 (indicated by the dot labeled "X" in FIG. 4B), the first radial curvature-power profile 311a has a higher radial curvature-power value than the second radial curvature-power profile 311b. At the boundary between the optic zone 302 and the peripheral zone 305 (indicated by the dot labeled "Y" in FIG. 4B), the first radial curvature-power profile 311a has the same radial curvature-power value as the second radial curvature-power profile. The first radial curvature-power profile 311a has a higher mean radial curvature power (indicated by the dotted line 317) than the mean radial curvature power of the second radial curvature-power profile 311b (indicated by the dotted line 317b).

[0084] As shown in Figure 4A, there is an alternating and periodic pattern of a first set of meridians 307a having a first radial curvature-power profile 311a (see Figure 4B) and a second set of meridians 307b having a second radial curvature-power profile 311b (see Figure 4B) around the optical zone 303. The meridians 307a in the first set are angularly spaced apart by approximately 2° or less, and the meridians 307b in the second set are angularly spaced apart by approximately 2° or less, such that the angular spacing between a meridian 307a in the first set and its neighboring meridian 307b in the second set is less than 1°. When the lens 301 is worn by a lens wearer, the lens wearer's eye is unable to distinguish between the two different radial curvature-power profiles.

[0085] 5A is a schematic plan view of a lens 401 according to another embodiment of the present disclosure. The lens 401 has an optic zone 403 centered on an optical axis 402 and a peripheral zone 405 surrounding the optic zone 403. A first meridian 407a (only one meridian 407a is labeled, the other meridians in the set are shown in dash-dot lines) that is part of a set of first meridians 407a extends from the optical axis 402 to a boundary 409 between the optic zone 403 and the peripheral zone 405. Along the first meridian 407a, the radial curvature power varies smoothly and continuously, and has a first radial curvature power profile 411a, as shown in FIG. 5B. 5B , the radial curvature-power profile 411 a along the first meridian 407 a varies in a quasi-random manner, with the peak of the radial curvature power located at a first radial distance from the optical axis (indicated by dotted line 412 a). The slope of the first radial curvature-power profile 411 a varies with distance from the optical axis 402. A second meridian 407 b extends from the optical axis 402 to the boundary 409 between the optic zone 403 and the peripheral zone 405. The radial curvature-power also varies smoothly and continuously along the second meridian 407 b that is part of a set of second meridians 407 b (only one meridian 407 b is labeled, while the other meridians in the set are shown with dashed lines), and the radial curvature-power has a second radial curvature-power profile 411 b, as shown in FIG. The second radially curved optical power profile 411b along this second meridian 407b varies in a quasi-random manner, with the peak of the radially curved optical power being located at a second, different distance from the optical axis (indicated by the dotted line 412b).

[0086] As shown in Figure 5A, there is an alternating and periodic pattern of a first set of meridians 407a having a first radial curvature-power profile 411a (see Figure 5B) and a second set of meridians 407b having a second radial curvature-power profile 411b (see Figure 5B) around the optical zone 403. The meridians 407a in the first set are angularly spaced apart by approximately 2° or less, and the meridians 407b in the second set are angularly spaced apart by approximately 2° or less, such that the angular spacing between a meridian 407a in the first set and its neighboring meridian 407b in the second set is less than 1°. When the lens 401 is worn by a lens wearer, the lens wearer's eye is unable to distinguish between the two different radial curvature-power profiles.

[0087] 6A is a schematic plan view of a lens 501 according to another embodiment of the present disclosure. The lens 501 has an optic zone 503 centered on an optical axis 502 and a peripheral zone 505 surrounding the optic zone. A first meridian 507a (dotted line) extends from the optical axis 502 to a boundary 509 between the optic axis zone 503 and the peripheral zone 505. The radial curvature power varies smoothly and continuously along the first meridian 507a, and has a first radial curvature-power profile 511a, as shown in FIG. 6B. The first radial curvature-power profile 511a along the first meridian 507a has a peak at a first radial distance from the optical axis (indicated by dotted line 512a). A second meridian 507b (dashed line) extends from the optical axis 502 to the boundary 509 between the optic zone 503 and the peripheral zone 505. Along the second meridian 507a, the radial curve power also varies smoothly and continuously, and has a second radial curve power profile 511b, as shown in FIG. 6B. The second radial curve power profile 511b along the second meridian 507b has a radial curve power peak at a second radial distance from the optical axis (indicated by dotted line 512b). A third meridian 507c (dashed line) extends from the optical axis 502 to the boundary 509 between the optic zone 503 and the peripheral zone 505. Along the third meridian 507c, the radial curve power also varies smoothly and continuously, and has a third radial curve power profile 511c, as shown in Figure 6B. The third radial curve power profile 511c along the third meridian 507c has a peak at a third radial distance from the optical axis (indicated by dotted line 512c). Around the optic zone 503 (i.e., at the gradation angle θ), each meridian has a peak of radial curve power at a different radial distance from the optical axis. The peaks thus form part of a spiral extending circumferentially along the optic zone 503.

[0088] As shown in FIG. 6A, the angular spacing between meridians 507a, 507b, and 507c along optical zone 503 is approximately 2°.

[0089] 7A is a schematic plan view of a lens 601 according to another embodiment of the present disclosure. The lens 601 has an optic zone 603 centered on an optical axis 602 and a peripheral zone 605 surrounding the optic zone. A first meridian 607a extends from the optical axis 602 to a boundary 609 between the optic axis zone 603 and the peripheral zone 605. Along the first meridian 607a, the radial curvature power varies smoothly and continuously, and has a first radial curvature-power profile 611a, as shown in FIG. 7B. The first radial curvature-power profile 611a along the first meridian 607a varies in a quasi-random manner, with the global peak (i.e., maximum absolute value) of the radial curvature power located at a first radial distance from the optical axis (indicated by dotted line 612a). 7B , the second meridian 607b is perpendicular to the first meridian 607a, which lies along the line θ=0° and the second meridian 607b is perpendicular to the first meridian 607a, which lies along the line θ=90°. Along the second meridian 607b, the radial curve-power also varies smoothly and continuously and has a second radial curve-power profile 611b, as shown in FIG. 7B . The second radial curvature-power profile 611b along this second meridian 607b varies in a quasi-random manner, with the global peak (i.e., maximum absolute value) of the radial curvature power located at a second different distance from the optical axis (shown by dotted line 612b). The average radial curvature power of the first radial curvature-power profile 611a (shown by dotted line 617a in FIG. 7B) is higher than the average curvature power of the second radial curvature-power 611b (shown by dotted line 617 in FIG. 7B). The first meridian 607a is part of a set of first meridians having the first radial curvature-power profile 611a (only one first meridian 607a is labeled, the other meridians are shown as dash-dot lines).The second meridian 607b is part of a set of second meridians having a second radially curved-power profile 611b (only one second meridian 607b is labeled, the others are shown in dashed lines). Each meridian in the first set of meridians has a corresponding orthogonal meridian that is part of a second set of meridians (only one first meridian 607a is labeled, the others are shown in dash-dot lines), i.e., each meridian having the first radially curved-power profile 611a is at a 90° angle to the meridian having the second radially curved-power profile 611b. As a result, the optic zone 603 of the lens 601 has a toric power profile.

[0090] FIG. 8 is a flow chart illustrating a method 1001 for manufacturing a lens according to one embodiment of the present invention. The lens has an optic zone centered on the optical axis and a peripheral zone surrounding the optic zone. Within the optic zone, the lens has a first radially curved power profile that varies continuously in a first radial direction from the optical axis to the peripheral zone along a first meridian. The lens has a second, different radially curved power profile that varies continuously in a second radial direction from the optical axis to the peripheral zone along a second meridian. The lens can have any of the features described above. In a first step 1003, the method includes forming a female mold member with a concave lens-forming surface and a male mold member with a convex lens-forming surface. In a second step 1005, the method includes filling a gap between the female and male mold members with bulk lens material. In a third step 1007, the method includes curing and forming the bulk lens material.

[0091] In alternative embodiments of the present disclosure, the lenses may be formed using lacing, rotational molding, or a combination of lacing and spin casting.

[0092] FIG. 9 is a flow chart illustrating a method 2001 for designing a lens according to one embodiment of the present disclosure. The lens has an optic zone centered on the optical axis and a peripheral zone surrounding the optic zone. Within the optic zone, the lens has a first radial curvature-power profile that varies continuously in a first radial direction from the optical axis to the peripheral zone along a first meridian. The lens has a second radial curvature-power profile that varies continuously in a second radial direction from the optical axis to the peripheral zone along a second meridian. The lens can have any of the features described above. In a first step 2003, the method includes selecting a first mean radial curvature-power value. In a second step 2005, the method includes selecting a second mean radial curvature-power value that is different from the first. In a third step 2007, the method includes designing a first curvature-power profile that produces the first mean radial curvature-power value. In a fourth step 2009, the method includes designing a second curve-power profile that produces the first mean radial curve-power value. In a sixth step 2011, the method includes designing an optic zone of the lens, the optic zone having a meridian with the first curve-power profile and a meridian with the second curve-power profile.

[0093] Those skilled in the art will recognize that features of these exemplary embodiments can be combined in other embodiments within the scope of the present disclosure. While the present disclosure has been described and illustrated with reference to specific embodiments, those skilled in the art will recognize that the invention can be embodied in many different variations not specifically described herein. Only certain possible variations are described below, and these are by way of example only.

[0094] In the exemplary embodiments of the present disclosure described above, the lenses are substantially circular and have a peripheral zone with a substantially circular periphery surrounding the optical zone. In embodiments of the present disclosure, particularly in those embodiments in which the ophthalmic lens is a spectacle lens, the peripheral zone may have a non-circular periphery. The periphery of the peripheral zone may be substantially oval, elliptical, or rectangular. The peripheral zone may be surrounded by a separate, non-optically active zone.

[0095] In the foregoing description, reference has been made to integers or elements having known, obvious, or foreseeable equivalents, and such equivalents are hereby incorporated by reference as if individually set forth. Reference should be made to the following claims, which define the true scope of the invention, which should be deemed to include any such equivalents. The reader will also understand that any integers or features of the present disclosure described as advantageous, convenient, or the like are optional and do not limit the scope of any independent claim. Furthermore, it should be understood that, while considered beneficial in some embodiments of the invention, such optional integers or features may not be desirable and, therefore, may not be recited in other embodiments.

Claims

1. 1. An ophthalmic lens having an optic zone centered on an optical axis and a peripheral zone surrounding the optic zone, wherein within the optic zone, the lens has a first radially curved power profile that varies continuously in a first radial direction from the optical axis to the peripheral zone along a first meridian, and a second, different radially curved power profile that varies continuously in a second radial direction from the optical axis to the peripheral zone along a second, different meridian.

2. 10. The ophthalmic lens of claim 1, wherein the first radial curvature-power profile has a first mean radial curvature-power value measured along the first meridian and the second radial curvature-power profile has a second, different mean radial curvature-power value measured along the second meridian.

3. The ophthalmic lens of claim 2 , wherein the first radially curved power profile and the second radially curved power profile have substantially the same shape.

4. 10. The ophthalmic lens of claim 1, wherein the first radial curvature-power profile has a first average radial curvature-power value measured along the first meridian, and the second radial curvature-power profile also has the same first average radial curvature-power value measured along the second meridian, and the first radial curvature-power profile has a different shape than the second radial curvature-power profile.

5. 5. The ophthalmic lens of claim 1, wherein at the optical axis, at least one of the first radially curved power profile and the second radially curved power profile provides a distance power of between +0.5D and −25.0D.

6. 6. The ophthalmic lens of claim 1, wherein at the optical axis, at least one of the first radially curved power profile and the second radially curved power profile provides a near power of between +0.5D and +25.0D.

7. 7. The ophthalmic lens of claim 1, wherein at the optical axis, the first radially curved power profile or the second radially curved power profile provides a distance vision power, and the other of the first radially curved power profile and the second radially curved power profile provides a near vision power.

8. 7. The ophthalmic lens of claim 1, wherein at the optical axis, the first and second radially curved power profiles have the same value, and at the boundary between the optical zone and the peripheral zone, the first and second radially curved power profiles have different values.

9. 9. The ophthalmic lens according to claim 1, wherein one of the first radial curvature refractive power profile and the second radial curvature refractive power profile has a radial curvature refractive power that monotonically increases as the radial distance from the optical axis increases, and the other of the first radial curvature refractive power profile and the second radial curvature refractive power profile has a radial curvature refractive power that monotonically decreases as the radial distance from the optical axis increases.

10. 10. The ophthalmic lens of claim 1, wherein one of the first and second radially curved power profiles comprises at least one peak at a first radial distance from the optical axis of the lens, and the other of the first and second radially curved power profiles comprises at least one valley at the first radial distance from the optical axis of the lens.

11. 11. The ophthalmic lens of claim 1, wherein the first radial curvature power profile comprises a radial curvature power peak at a first radial distance from the optical axis, and the second radial curvature power profile comprises a radial curvature power peak at a second, different radial distance from the optical axis of the lens.

12. 12. The ophthalmic lens of claim 1, wherein the first radially curved power profile and / or the second radially curved power profile span a power range of at least 5.0D.

13. 13. The ophthalmic lens of claim 1, wherein a first set of meridians distributed at regular intervals around the optical zone have a first mean radial curvature power, and a second set of meridians distributed at regular intervals around the optical zone have a second mean radial curvature power.

14. 14. The ophthalmic lens of claim 13, wherein the meridians of the first set of meridians and the meridians of the second set of meridians form an alternating pattern around the lens.

15. 15. The ophthalmic lens according to claim 13, wherein the angular interval between a meridian belonging to the first set of meridians and an adjacent meridian belonging to the second set of meridians is less than 1°.

16. 16. The ophthalmic lens of claim 1, wherein along at least one other meridian within the optical zone, the radial curvature power varies with a third radial curvature power profile different from the second radial curvature power profile and the first radial curvature power profile.

17. 17. An ophthalmic lens according to any one of claims 1 to 16, wherein each meridian along the optical zone has a radial curvature power peak at a different radial distance from the optical axis for each meridian.

18. 18. The ophthalmic lens of claim 17, wherein the peak of radial curvature power along the optic zone forms a portion of a spiral.

19. 19. The ophthalmic lens of claim 1, wherein a first set of meridians has the first mean radial curvature refractive power and a second set of meridians has a second, different mean radial curvature refractive power, and each meridian in the second set of meridians is orthogonal to a meridian in the first set of meridians.

20. 20. The ophthalmic lens of any one of claims 1 to 19, wherein the radially curved refractive power of the optic zone is derived from the curvature of the anterior surface of the lens.

21. The ophthalmic lens according to any one of claims 1 to 20, wherein the lens is a contact lens.

22. The ophthalmic lens according to any one of claims 1 to 20, wherein the lens is a spectacle lens.

23. 23. A method for manufacturing an ophthalmic lens, said method comprising forming an ophthalmic lens according to any one of claims 1 to 22.

24. A method for designing an ophthalmic lens according to any one of claims 1 to 22, said method comprising: selecting a first mean radial curvature power value; selecting a second different mean radial curvature power value; designing a first curved-power profile that produces the first mean radial curved-power value; designing a second curved-power profile that produces the second mean radial curved-power value; and designing an optical zone of the lens, the optical zone including a meridian having the first curved power profile and a meridian having the second curved power profile.

Images