Improved multifocal lens, lens system and lens kit

Abstract

An improved multifocal ophthalmic lens comprising a central optical zone for near vision correction; a first peripheral optical zone incorporating at least one zone that transitions the power down from the power of the central optical zone to a second peripheral optical zone incorporating remote refractive error correction. At least one optical zone may be configured with an aspheric curvature, which may provide a substantially constant power distribution within at least a portion of the zone. The improved ophthalmic lens may form at least one lens in a lens system. The improved ophthalmic lenses may form a lens kit in which a portion of myopic and / or hyperopic degrees provides at least one improved ophthalmic lens in the kit over a wide range of lens degrees to correct vision of low, moderate, and / or highly presbyopic persons.

Description

Cross - Reference to Related Applications

[0001] This application claims priority to U.S. Provisional Application No. 63 / 410,418, filed on September 27, 2022. This disclosure is related to International Application No. PCT / IB2021 / 057720, filed on August 21, 2021, which claims priority to International Application No. PCT / IB2020 / 057863, filed on August 21, 2020, and U.S. Provisional Application 63 / 092,199, filed on October 15, 2020, and International Application No. PCT / IB2021 / 055686, filed on June 25, 2021. The entire content of each of the foregoing priority and related applications is incorporated herein by reference in its entirety. Technical Field

[0002] The present invention generally relates to contact lenses, and more particularly to multifocal contact lenses. Background Art

[0003] Accommodation enables a person with normal vision to focus on objects from infinity to the near point, typically at a distance of about 25 cm or closer to the eye. A presbyope has lost the ability to accommodate over such a large range and typically requires at least two corrections: a distance correction for focusing at infinity and a near - point correction for focusing on nearby objects. The correction is usually different for each eye, typically prescribed in quarter diopters.

[0004] Multifocal glasses provide these two corrections, as well as intermediate corrections, in different regions of a single lens for each eye. Such glasses rely on the fact that the glasses lenses are relatively fixed with respect to the eyes, such that the glasses wearer typically looks through the upper part of the lens at distant objects and through the lower part of the lens at nearby objects.

[0005] In the art, multifocal contact lenses are known that provide two corrections for a particular eye in a single lens. However, unlike glasses lenses, contact lenses move with the movement of the eyes. Thus, the multifocal contact lenses known in the art use a variety of different systems to enable a presbyope to be adequately corrected for viewing near and distant objects. Unfortunately, not all of these systems have been well - received by users, and even those that have been well - received may still need improvement.

[0006] U.S. Patent 5,125,729 to Mercure (the disclosure of which is incorporated herein by reference) describes a lens having a central spherical circular region on the front surface, which is surrounded by an annular aspherical region. The central region is responsible for distance vision. The annular aspherical region provides vision at all distances, including reading.

[0007] U.S. Patent 5,526,071 to Seidner et al. (the disclosure of which is incorporated herein by reference) describes a diagnostic contact lens. After a diagnostic overrefraction procedure, the patient will wear a prescription lens. The prescription lens has two anterior toric aspheric surfaces, or in the case of intermediate vision to be corrected, three (or more) anterior aspheric surfaces. The distance vision zone is the central zone of the lens, while the near point vision zone is one of the toric zones at the periphery of the anterior surface of the lens.

[0008] U.S. Patents 5,619,289 and 5,691,797 to Seidner et al. (the disclosures of which are incorporated herein by reference) describe a lens for distance vision correction having an anterior central aspheric surface with a diameter of about 1.5 - 2.5 mm and an eccentricity of about -0.8. The first toric surface surrounding the central surface is aspheric and has a diameter of about 2.0 - 3.5 mm. The other toric surfaces have diameters of about 2.3 - 4.0 mm, and 3.5 - 8.0 mm and may be spherical or aspheric.

[0009] U.S. Patent 5,754,270 to Rehse et al. (the disclosure of which is incorporated herein by reference) describes a lens having a central aspheric optical zone with a diopter power equal to the distance power correction, plus an additional power range of 2.25 to 2.5 diopters outward from the center. There is a second "blend zone" concentric with the central zone that provides a rapid power change of about -0.5 to about -1.25 diopters over a small distance of about 0 to 0.2 mm (typically about 0.05 mm).

[0010] U.S. Patents 5,864,379 and 6,540,353 to Dunn (the disclosures of which are incorporated herein by reference) describe a lens having a central spherical circular zone that is overcorrected by a typically amount of about 25% - 100% for near point vision and has a diameter of about 1.0 - 2.5 mm. The central zone is surrounded by up to three toric aspheric zones, the first two having a thickness of about 0.5 mm and the third having an outer diameter of about 8 mm.

[0011] U.S. Patents 6,030,077 and 6,260,966 to Sawano et al. (the disclosures of which are incorporated herein by reference) describe a lens having a central circular spherical zone with a first constant power, an intermediate toric aspheric zone, and an outer toric spherical zone with a second constant power. The radii of different parts of the intermediate zone are calculated from two opposing parabolas that are smoothly connected to each other and are related to the constant powers of the central and outer zones.

[0012] Wada's U.S. Patent No. 6,116,735, the disclosure of which is incorporated herein by reference, describes a lens having zones that alternate between near and far correction zones. There are typically four zones. The central near point vision zone has a diameter of approximately 1-2 mm, and the other zones are of equal width, approximately 0.63 mm.

[0013] U.S. Patent No. 6,929,366 to Perel et al., the disclosure of which is incorporated herein by reference, describes a contact lens having a central circular zone, an annular outer zone, and an annular zone intermediate the central and outer zones on the front surface, with one or more continuous intermediate annular zones. All of these zones are substantially spherical and generate zone powers, where the central zone power is selected to correct near point vision, and the annular outer zone power is less than the central zone, and the one or more intermediate annular zones generate corresponding one or more intermediate zone powers with a refractive power that decreases monotonically from the central zone to the annular outer zone.

[0014] U.S. Patent No. 8,777,415 to Back, the disclosure of which is incorporated herein by reference, describes multifocal contact lenses and methods of improving vision in presbyopic patients. The multifocal contact lenses include an optical zone having an aspheric power distribution that provides a near point vision power and a distance vision power, and provides an additional (ADD) power corresponding to the difference between the near point vision power and the distance vision power. The multifocal contact lenses can improve binocular vision in a subject by prescribing such that the non-dominant eye contact lens is overcorrected for distance vision while both multifocal contact lenses are undercorrected for the ADD power requirements of the presbyopic subject.

[0015] A multifocal contact lens having a lens zone (e.g., a near point zone, a distance zone, an intermediate zone, and / or a transition zone) formed by a spherical curvature can form a non-constant power distribution in that zone, e.g., the zone providing distance vision correction, and although the lens is marked with a single power representative of distance refractive error correction, the power across the distance vision zone can vary significantly by up to several diopters across the zone. In some embodiments, it may be desirable to provide a multifocal lens with a substantially constant power distribution and / or reduced lens aberrations and / or improved image quality, which can improve lens power measurement, lens power marking, lens manufacturing quality control ("QC"), provide a more consistent lens power distribution within the marked lens power range desired by the population, and / or allow for more predictable vision performance.

[0016] Improvements in manufacturing QC and regional image quality can increase the lens wearing convenience for practitioners by reducing the time required for trial fitting. During the lens power selection process, the clearer the patient's response to the vision test, the more likely it is to reduce the number of lenses worn to obtain the final prescription lens power, and / or the simpler it is to provide a predictable and / or general lens selection nomogram for the lens powers provided in the lens kit.

[0017] For existing multifocal lenses, due to the non-constant power distribution within the zone and the poor final image quality of the focusing target used to determine the focal power (e.g., in a mire-based QC system), the measurement of a single power across a relatively small zone size may vary. Alternatively, other QC systems (e.g., wavefront-based systems) can average the non-constant powers to represent a single marked power. Thus, in the production of a single lens power and between different lens power stock keeping units, defining a single lens power to label the distance power of the lens may be less accurate and / or more variable, resulting in a reduced QC tolerance, and the associated variability can have clinical significance, leading to a less clear endpoint for the refractive assessment by the practitioner, beyond the standardized increment of 0.25D. Therefore, selecting a lens power for a subject via a traditional nomogram related to the marked power and refractive error or alternatively via a trial wear and over-refraction procedure may be less reliable for a given prescription or across the range of prescriptions covered by the lenses in a lens kit.

[0018] Existing multifocal lenses formed by spherical curvatures may form a non-constant power distribution in the central optical zone, especially in the peripheral optical zones, thereby providing far, intermediate, and near-point vision correction for presbyopic individuals. In some embodiments, it may be desirable to provide a multifocal contact lens to reduce optical aberrations in one or more of the central and peripheral optical zones by obtaining a more uniform power distribution, thereby improving vision.

[0019] The improvement in vision provided by multifocal lenses with a more uniform power distribution can reduce the interference of out-of-focus images on the focused retinal image, thereby reducing ghost images and reducing contrast loss, thereby improving distance and / or near-point and / or intermediate vision and vision stability (including those visual impairments caused by lens decentration and lens movement), and improving night vision by reducing light interference. Improving night vision can help improve the quality of night driving and eliminate the inconvenience of removing the lenses while driving or wearing the lenses in low light conditions. In addition, visual impairments can be reduced, more consistent vision performance can be obtained in various visual environments, and a more consistent visual experience can be obtained within the range of presbyopia prescriptions of various powers within the lens kit. Therefore, understanding the responses of individual and group wearers to the vision provided by the improved multifocal lenses by practitioners can help predict performance and achieve more effective patient management.

[0020] Any reference to prior art in the specification is not and should not be construed as an admission or any form of suggestion that such prior art constitutes a part of the common general knowledge in any jurisdiction or that such prior art would reasonably be expected to be ascertained, understood and regarded as relevant by a person skilled in the art. Summary of the Invention

[0021] Some embodiments relate to improved multifocal contact lenses.

[0022] Some embodiments relate to improved multifocal contact lenses made of a transparent polymeric material (e.g., hydrogel, silicone hydrogel, and / or rigid gas permeable polymer) and including a posterior surface having a base curve adapted to conform to the wearer's eye and an anterior surface including a plurality of optical zones. A central optical zone is formed such that the diopter of the central zone is at least greater than the positive diopter required to correct the wearer's distance refractive error. For example, the central zone diopter value can be set to correct the wearer's near point refractive error, i.e., adding a positive diopter to the distance refractive error, referred to as the near addition or ADD diopter. An annular outer peripheral optic zone is configured to have an outer peripheral optic zone diopter with a positive diopter less than the diopter of the central zone, e.g., the diopter value for correcting the distance refractive error. A plurality of intermediate peripheral optical zones are formed between the central zone and the outer peripheral optical zone. The diopter of each intermediate peripheral optical zone can be configured to be between the diopter of the central and annular outer peripheral optical zones, and each intermediate peripheral optical zone diopter is set such that the diopters of all zones form a progression of diopter change from the central zone to the outer peripheral optical zone. The diopter progression between the central and outer peripheral optical zones can be monotonic or non - monotonic or periodic or non - periodic or smooth or stepped or linear or curved or any combination thereof, and generally the positive diopter decreases over the intermediate optical zones. The intermediate peripheral optical zones incorporate at least one zone that transitions the diopter from the central optical zone to the outer peripheral optical zone, thereby incorporating distance refractive error correction.

[0023] In certain embodiments, the optical zones (e.g., the central zone, intermediate peripheral optical zones, and / or outer peripheral optical zones) can be configured with at least one aspheric curvature, e.g., an aspheric whole or segment or strip, extended odd polynomial, extended even polynomial, conic section, bi - conic section, toric surface, Zernike polynomial, super - conic, logarithmic function, exponential function, trigonometric (e.g., sine, cosine) function, Fourier series, conic function, polynomial function, power function, wavelet function, Bessel curve, spline curve (e.g., basic spline or cubic spline, etc.) or spline surface, trochoid, cycloid (e.g., epicycloid), catenary, and / or any predefined mathematical function or combination of such algebraic or non - algebraic functions, and can provide a substantially flat (e.g., constant) diopter distribution within at least a portion of the zone.

[0024] Some embodiments relate to lens systems where the improved ophthalmic contact lens forms at least one lens in the lens system, e.g., one of a pair of lenses.

[0025] Some embodiments relate to lens kits, where improved ophthalmic contact lenses can form a lens kit, and where a portion of the myopia and / or hyperopia power provides at least one improved ophthalmic lens that spans various lens powers in the kit. In some embodiments, the myopia and / or hyperopia powers can be 4, 6, 8, 10, 12, 14, 16, 18, or 20 or more, or other reasonable numbers within this range.

[0026] In some embodiments, the improved ophthalmic contact lenses can cover a wide range of lens powers provided in the outer peripheral optical zone in the lens kit for correcting distance refractive errors, which can include + / - 10.0D or + / - 15.0D or a subset of the distance refractive lens powers in the lens kit, combined with the central zone power, to provide at least one or more ADD powers (such as +1D ADD or +1.5D ADD or +2D ADD or +2.5D ADD or higher) to correct the near vision of low and / or moderate and / or high presbyopes.

[0027] Some embodiments relate to improved ophthalmic lenses for presbyopia correction, the ophthalmic lens comprising: a central optical zone having a combined lens power that is at least greater than the positive power required to correct distance refractive errors; a first peripheral optical zone having one or more zones with a power that is at least lower than the power of the central optical zone, and where at least one of the contiguous zones has a lower power than any previous zone, e.g., a smaller positive power; a second peripheral optical zone having a combined lens power that is at least the power required to correct distance refractive errors; and where at least one curvature forming any of the central optical zone and / or the first peripheral optical zone and / or the second peripheral optical zone is not spherical.

[0028] In some embodiments, the junctions between the zones can be generally sharp or unmixed, and the shape or smoothness of the junctions can be substantially produced by applying a molded or unmixed transition during the lathe cutting process of the lens. In some embodiments, the junctions between the zones can not be generally sharp and can be mixed, and the junctions can be smooth by the manufacturing process or by designing mixed or smooth features (such as narrow curvatures between the zones). In some embodiments, the power progression from the central zone to the second peripheral zone and / or any zone therebetween can be defined by any mathematical function that gives the values of the refractive powers of one or more intermediate zones relative to the refractive power of the central zone and the refractive power of the second peripheral optical zone, as well as the dimensions of the zones. In some embodiments, the power progression can be smooth and continuous, while in certain embodiments, the power progression can not be smooth and continuous. In some embodiments, the power progression is stepwise.

[0029] In some embodiments, the monotonic degree progression is a progression selected from a geometric progression and a logarithmic progression. In some embodiments, the monotonic degree progression consists of a substantially linear progression. In some embodiments, the monotonic degree progression is periodic or non-periodic. In some embodiments, the progression is non-monotonic and the progression is selected from predefined functions. In some embodiments, the non-monotonic degree progression is periodic or non-periodic.

[0030] The present disclosure can be more fully understood from the following detailed description of its embodiments in conjunction with the accompanying drawings, which are briefly described hereinafter. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings facilitate understanding of the various embodiments of the present invention.

[0032] FIG. 1 shows a planar cross-sectional view of a multifocal contact lens configured with an aspherical curvature.

[0033] FIG. 2 depicts the degree distribution of a multifocal contact lens configured with an aspherical curvature.

[0034] FIG. 3 depicts the degree distribution of a multifocal contact lens configured with a spherical curvature.

[0035] FIG. 4 depicts the degree distribution of a multifocal contact lens configured with an aspherical curvature in a lens kit.

[0036] FIG. 5 depicts the degree distribution of a multifocal contact lens configured with a spherical curvature in a lens kit.

[0037] FIG. 6 depicts the degree distribution metrics and design dimensions of a multifocal contact lens configured with an aspherical curvature.

[0038] FIG. 7 depicts a table of degree distribution metrics of a multifocal contact lens configured with an aspherical curvature.

[0039] FIG. 8 depicts the degree distribution metrics and design dimensions of a multifocal contact lens configured with a spherical curvature.

[0040] FIG. 9 depicts a table of degree distribution metrics of a multifocal contact lens configured with a spherical curvature.

[0041] FIG. 10 depicts the degree distribution of a multifocal contact lens configured with an aspherical curvature and a controlled degree distribution in a lens kit.

[0042] FIG. 11 depicts a table of degree distribution metrics of a multifocal contact lens configured with an aspherical curvature and a controlled degree distribution.

[0043] FIG. 12 depicts the degree distribution of a multifocal contact lens configured with an aspherical curvature and a controlled degree distribution in a lens kit.

[0044] Figure 13 depicts a power profile table of a multifocal contact lens configured with an aspherical curvature and a controlled power distribution. DETAILED DESCRIPTION

[0045] Referring now to FIG. 1, which shows a plan view cross-section of a multifocal ophthalmic contact lens configured with an aspherical curvature. The multifocal lens may be made of a hydratable transparent material known in the art for manufacturing contact lenses and commonly used for manufacturing “soft” contact lenses. The multifocal lens may be made of any other suitable transparent material for manufacturing contact lenses, such as glass or plastic, such as materials known in the art for manufacturing “rigid gas permeable” contact lenses.

[0046] After production, the size of the multifocal lens may change, typically when the material of the lens hydrates to become the “wet” size, i.e., the size of the lens under normal use. Unless otherwise stated, the sizes of the multifocal lenses given below are wet sizes.

[0047] The multifocal lens 100 having a base power distribution includes a front surface 105, a rear surface 106, a central optical zone 101, a first peripheral (intermediate) optical zone 102 and a second peripheral (outer) optical zone 103, and an outer non-optical zone 104. The rear surface 106 is formed with a base curvature to fit the eye of the lens user and may be formed with at least one spherical or aspherical curvature. The multifocal lens includes a plurality of annular concentric (e.g., rotationally symmetric or asymmetric) zones that provide optical correction for the wearer's eye. At least one of the front surface zones and / or the rear surface may be formed with an aspherical curvature (i.e., a curvature that is not spherical). The outer zone 104 serves as an optically inactive carrier for the optical zones, and its outer diameter typically corresponds to the total diameter of the multifocal lens. In some embodiments, the outer zone diameter may start at 6.0 mm and end at 15.0 mm, e.g., 7.5 mm to 14.5 mm or 7.0 mm to 14.0 mm, or the outer zone may start at 5.0 mm to 10.0 mm, and the total diameter may be 13.0 mm to 16.0 mm, e.g., 13.5 to 15 mm or e.g., 14.0 to 14.5 mm.

[0048] The diameter of the central zone 101 can be 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.75, 1.0, 1.25, 1.5, 1.75, 2.0, 2.25, 2.5, 2.75, 3.0, 3.25, 3.5, 3.75 or 4.0 mm, or other reasonable values within this range. The central zone 101 can be formed by a surface curvature (e.g., an aspherical curvature) to form a power distribution that, when combined with the back surface curvature 106, the lens thickness, and the refractive index, can produce at least one focal point along the optical axis. The central zone curvature has a value such that the central zone power, which is a function of the central zone 101 curvature and the back surface curvature 106, is substantially constant and approximately equal to the near point refractive error correction of the lens wearer. The positive power of the central zone 101 can be at least 0.25 D higher than the power required to correct the far distance refractive error.

[0049] The second peripheral optical zone 103 is formed to have an outer zone curvature (e.g., an aspherical curvature) that, together with the back surface curvature, provides a value of the second peripheral optical zone power that is less than the power of the central zone 101 (e.g., the power to correct the far distance refractive error of the wearer), and can be in the range of + / - 10.0 D or + / - 15.0 D.

[0050] Between the central zone 101 and the second peripheral optical zone 103 is the first peripheral optical zone 102, which consists of intermediate peripheral optical zones 102a and 102b. The first peripheral zone 102 may be adjacent to the central zone 101. The second peripheral optical zone 103 may be adjacent to the first peripheral zone 102 and the external non-optical zone 104. In some embodiments, the second peripheral optical zone 103 may not be adjacent to the first peripheral zone 102 and / or the external non-optical zone 104. The first peripheral zone 102 includes a plurality of annular intermediate optical zones 102a and 102b, the widths of which may be 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.125, 0.15, 0.175, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9 or 2.0 mm, or other reasonable numbers within this range. The peripheral annular intermediate optical zones 102a and 102b may be located on the front surface 105 and may be formed by corresponding aspherical (e.g., aspheric) curvatures 1021 and 1022. At least one of the annular optical zones 102a and / or 102b may be at least 0.125 D (e.g., at least 0.25 D) less positive than the central zone 101, and at least one of the continuous zones may be at least 0.125 D (e.g., at least 0.25 D) less positive than any previous connected zone in the first peripheral optical zone 102. The width of the second peripheral optical zone 103 may be 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.125, 0.15, 0.175, 0.2, 0.3, 0.4, 0.5, 1.0, 1.25, 1.5, 1.75, 2.0, 2.25, 2.5, 2.75, 3.0, 3.25, 3.5, 3.75, 4.0, 4.25, 4.5, 4.75 or 5.0 mm, or other reasonable numbers within this range. The second peripheral optical zone 103 may be located on the front surface 105 and may be formed by a corresponding aspherical (e.g., aspheric) curvature 1031.

[0051] The first intermediate peripheral optical zone 102a may be formed to have a first zone curvature, which together with the back surface curvature produces a first zone power. The second intermediate peripheral optical zone 102b may be formed to have a second zone curvature R 2b , which together with the back surface curvature produces a second zone power.

[0052] At least one of the central zone 101 and / or the annular intermediate peripheral zones 102a and / or 102b and / or the second peripheral optical zone 103 has a myopia and / or hyperopia power and / or both myopia and hyperopia powers within the range of + / -8D, or + / -10.0D or + / -15.0D, and forms a substantially constant power for any power or a part or a majority (e.g., 10% or more, 20% or more, 40% or more, 50% or more, or 75% or more) of the lens power.

[0053] In some embodiments, at least one curvature forming the central zone 101 and / or any one of the peripheral optical zones 102 and 103 may be aspherical. At least one curvature forming the central zone 101 and / or any one of the peripheral zones 102 and 103 may at least partially correct for higher order aberrations of the multifocal lens, such as longitudinal spherical aberration. In some embodiments, at least one curvature forming the central zone 101 and / or any one of the peripheral zones 102 and 103 may provide a power distribution that is substantially constant over at least a portion of the optical zone. In some embodiments, at least one curvature forming the central zone 101 and / or any one of the peripheral zones 102 and 103 may provide a power distribution that is not substantially constant over at least a portion of the optical zone, e.g., the degree of variation of the power distribution of at least one optical zone may be 0.5D or more, or 1.0D or more, or 1.5D or more. In some embodiments, at least one curvature forming the central zone 101 and / or any one of the peripheral zones 102 and 103 may provide a power distribution that is substantially constant over the range of lens powers in the kit. In some embodiments, at least one curvature forming the central zone 101 and / or any one of the peripheral zones 102 and 103 may provide a controlled power distribution over the range of lens powers in the kit, e.g., it may have a controlled power distribution variation for a series of lens powers in the kit, which may be controlled by a mathematical relationship.

[0054] In some embodiments, at least one curvature forming any of the central zone 101 and / or the first peripheral zone 102 and / or the second peripheral zone 103 may be non - coaxial.

[0055] In some embodiments, at least one curvature forming any of the central zone 101 and / or the first peripheral zone 102 and / or the second peripheral zone 103 may form a non - spherical toroid.

[0056] In some embodiments, at least one curvature forming any of the central zone 101 and / or the first peripheral zone 102 and / or the second peripheral zone 103 may form a spherical toroid.

[0057] In some embodiments, at least one curvature that forms any of the central zone 101 and / or the first peripheral zone 102 and / or the second peripheral zone 103 results in a focal point being formed on the optical axis in front of, above, and / or behind the retinal plane (e.g., by using spherical, or aspherical toric or multi-spherical curvatures or by tilting the curvature or by using curvature or line curvature to form zones with relatively more positive or relatively more negative degrees of comparable distance refractive errors).

[0058] In some embodiments, at least one curvature that forms any of the central zone 101 and / or the first peripheral zone 102 and / or the second peripheral zone 103 can form an off-axis focal point in front of, above, and / or behind the retinal plane (e.g., by curves and / or lines on either or both surfaces of the lens).

[0059] In some embodiments, the surface geometry of at least one curvature that forms any of the central zone 101 and / or the first peripheral zone 102 and / or the second peripheral zone 103 can result in an off-axis focal point in front of, above, and / or behind the retinal plane.

[0060] In some embodiments, at least one curvature that forms any of the central zone 101 and / or the first peripheral zone 102 and / or the second peripheral zone 103 and forms an on-axis and / or off-axis focal point in front of, above, and / or behind the retinal plane can be present on one or more lenses in a lens kit.

[0061] In some embodiments, at least one curvature that forms any of the central zone 101 and / or the first peripheral zone 102 and / or the second peripheral zone 103 can be non-rotationally symmetric.

[0062] In some embodiments, at least one curvature that forms any of the central zone 101 and / or the first peripheral zone 102 and / or the second peripheral zone 103 can be applied only partially to the zone, e.g., only to a portion of an annular concentric zone such that less than 360 degrees of the zone has the curvature applied.

[0063] Multifocal lenses can be produced by any contact lens process known in the art, such as but not limited to turning or molding or casting or any combination thereof, including for example using one or more such processes to at least partially form a portion of the surface of the multifocal lens on any lens processing component (such as a mold or a model or lens material) used in the manufacturing process. Thus, in a particular zone (e.g., a central zone, such as 101; a first peripheral optical zone, such as 102a, 102b; and a second peripheral optical zone, such as 103), at least one zone can be formed to have a substantially constant power or at least substantially constant power over a portion of the at least one zone, or at least have a controlled power distribution in at least one zone of at least a range of multifocal lenses in a kit, e.g., lens powers marked in the range of + / -8.0D, + / -10.0D, + / -15.0D, + / -20.0D and / or near addition powers required to correct the near point refractive error of low, medium and / or high addition presbyopic patients.

[0064] In some embodiments, the multifocal lens can include at least one or more toric optical zones on the posterior or anterior surface to correct presbyopic patients suffering from astigmatism. In some embodiments, at least one toric optical zone of the multifocal lens is formed by at least one aspheric curvature in at least one meridian of the lens to provide a substantially constant power distribution along at least one meridian. In some embodiments, the toric multifocal lens is designed with a lens orientation feature, e.g., a rotationally asymmetric thickness distribution commonly referred to as a ballast, to substantially align the cylinder axis of the lens astigmatism with the astigmatism of the wearer's eye during use. Any type of orientation feature can be used, e.g., a prism ballast, an equal thickness prism ballast (or at least partially an equal thickness prism ballast), a non-equal thickness prism ballast, at least one thin zone, a lower and / or horizontal and / or lower oblique thickened zone, an upper thinned zone or any combination thereof. In some embodiments, the orientation feature can be located in one or more optical zones or can be located outside the peripheral of the optical zone.

[0065] In some embodiments, the multifocal lens includes an integer number of first peripheral intermediate optical zones other than two, wherein the powers of such first peripheral intermediate optical zones form a monotonic progression when combined with the power of the central zone and the power of the second peripheral optical zone. In some embodiments, the multifocal lens includes an integer number of first peripheral intermediate optical zones other than two, wherein the powers of such first peripheral intermediate optical zones form a non-monotonic progression when combined with the power of the central zone and the power of the second peripheral optical zone. In some embodiments, the multifocal lens includes an integer number of first peripheral intermediate optical zones other than two, wherein the powers of such first peripheral intermediate optical zones form a periodic progression when combined with the power of the central zone and the power of the second peripheral optical zone. In some embodiments, the multifocal lens includes an integer number of first peripheral intermediate optical zones other than two, wherein the powers of such first peripheral intermediate optical zones form a non-periodic progression when combined with the power of the central zone and the power of the second peripheral optical zone.

[0066] In some embodiments, the multifocal lens forms at least one lens of a lens system, wherein the multifocal lens is for the dominant or non-dominant eye of a presbyopic person.

[0067] In some embodiments, the multifocal lens forms at least one lens of a lens system, wherein the multifocal lens is for correcting the vision of a presbyopic person who requires a low addition (e.g., +1 D) or a medium addition (e.g., +1.75 D) or a high addition (e.g., +2.5 D).

[0068] Referring to FIG. 2, the power distribution of a multifocal contact lens configured with an aspherical curvature in each zone is depicted, wherein the marked lens powers are +8 D and -8 D, high addition (e.g., +2.5 D).

[0069] Referring to FIG. 3, there is depicted the power distribution of a multifocal contact lens configured with spherical curvature in each zone, where the marked lens powers are +8D and -8D, with a high addition (e.g., +2.5D). Comparing the power distribution of a multifocal lens with aspherical curvature (FIG. 2) to that of a multifocal lens with spherical curvature, there is a difference in the power uniformity within the optical zone range. In the multifocal lens configured with spherical curvature, the power change in the second peripheral optical zone 103 between 301 and 302 (for the +8D lens power) is 2.3D, and the power change between 304 and 305 (for the -8D lens power) is 1.6D. Thus, a lens kit including a multifocal lens formed with spherical curvature can vary in the relative positions of 302 and 304 (e.g., the power distribution normalized with respect to the starting points of the second peripheral optical zones 301 and 305) for the +8D and -8D lens powers by up to 3.9D. Similarly, the lens power difference between the central optical zone (at 303) of the +8D multifocal lens configured with spherical curvature and the end 301 of the first peripheral optical zone (reading addition) is +3D, while the power difference between the central optical zone (at 306) of the -8D lens and the end 304 of the first peripheral optical zone (reading addition) is approximately 1D lower, at 2.1D. The marked lens powers (distance power and reading addition) represent the average power (distance power) of the power distribution within the second peripheral optical zone 103 and the average power difference (addition power) between the central zone 101 and the second peripheral zone 103, and may not accurately represent the powers required to correct the distance and near point refractive errors of a presbyopic wearer within the lens power range of the kit. As depicted in FIG. 3, the optical zones of a multifocal lens formed with spherical curvature can form a non-constant power distribution in at least one optical zone (e.g., the second peripheral optical zone providing, for example, distance vision correction), and the power distribution can vary by up to 2.0D across the zone and by up to 5.0D or more between the lenses in the kit (lens power range starting from + / -12D). Thus, a kit containing multifocal lenses designed with spherical curvature can severely mis-correct the wearer's distance and / or near point vision, depending on the marked lens power requirements, and can lead to blurred vision and visual dissatisfaction for the wearer, leaving the practitioner with no ready means to address complaints.

[0070] In contrast, in the dioptric power distribution (Figure 2) of an improved multifocal lens configured with aspherical curvature (+8D and -8D lens powers, with high addition), the dioptric power change in the second peripheral optical zone 103 is approximately 0D between 201 and 202 (for +8D lens power) and between 204 and 205 (for -8D lens power). Thus, the lens kit including the multifocal lens formed by aspherical curvature may not change significantly in the relative positions of 201 and 204 (e.g., the dioptric power distribution normalized with respect to the starting points 202 and 205 of the second peripheral optical zone) for +8D and -8D lens powers, being 0D. Similarly, the dioptric power difference between the central optical zone (at 203) and the end 202 of the first peripheral optical zone (reading addition) of the +8D multifocal lens configured with aspherical curvature (Figure 2) is 2.2D, while the dioptric power difference between the central optical zone (at 206) and the end 205 of the first peripheral optical zone (reading addition) of the -8D lens is the same, i.e., 2.2D. In some embodiments, the optical zones of the improved multifocal lens formed by aspherical curvature may form a constant dioptric power distribution over at least one optical zone (e.g., the second peripheral optical zone providing, for example, distance vision correction) and / or a constant dioptric power difference between two optical zones (e.g., the central zone and the second peripheral optical zone), and may not change significantly between the lenses in the lens kit. Thus, the improved multifocal lens may provide, for example, a more consistent dioptric power distribution within the lens and / or between the lenses in the kit, resulting in marked lens powers that may provide a more accurate and predictable lens prescription to correct the distance and / or near point refractive errors of presbyopic patients and result in improved visual performance.

[0071] Referring to Figure 4, a sample of the dioptric power distribution of a multifocal contact lens with aspherical curvature (e.g., in the second peripheral optical zone) included in a contact lens kit is shown. The sample dioptric power distribution of this exemplary kit ranges from +8.0D to -8.0D lens powers, with a high addition (such as +2.5D). In some embodiments, at least one multifocal contact lens with aspherical curvature (e.g., in the second peripheral optical zone) of the lens kit may be used to correct distance refractive errors in the range of + / -8.0D, + / -10.0D, + / -15.0D, + / -20.0D, or any other reasonable lens power within this range, as well as near point refractive errors to correct for high addition (e.g., +2.5D).

[0072] Referring to FIG. 5, a sample of the power distribution of a multifocal contact lens with spherical curvature included in a contact lens kit is shown. The sample power distribution of this exemplary kit ranges from +8.0D to -8.0D, with a high addition (e.g., +2.5D). Comparing the power distribution of the multifocal lens having an aspherical curvature formed in the optical zone in FIG. 4, there are differences in the power uniformity within the zone, where the multifocal lens with an aspherical curvature provides a more uniform power within the optical zone.

[0073] Referring to FIG. 6, the power distribution metrics and design dimensions of a multifocal contact lens with an aspherical curvature formed in the contact lens kit depicted in FIG. 4 are shown. The power distribution metrics are for a multifocal contact lens with an aspherical curvature, and its sample power distribution ranges from +8.0D to -8.0D lens power, with a high addition (e.g., +2.5D). The power metrics used to describe the improved multifocal lens with an aspherical curvature are shown in FIG. 6 and may be as follows: D is the diameter of the central optical zone 101; W1 is the semi-chord diameter of the central optical zone 101 (D / 2) plus the width of the first peripheral optical zone 102; W2 is the width of the second peripheral optical zone 103; C is the addition power, which is calculated as the power difference between the central optical zone (e.g., at 603 of the +8D lens) and the starting end of the second peripheral zone 103 (e.g., at 602 of the +8D lens); B1 is the power difference within the second peripheral optical zone 103 (e.g., between 601 and 602 of the +8D lens); B2 is the power difference within zone 103 (e.g., between 604 and 605 of the -8D lens); A is the power difference calculated between the power of the central optical zone 101 (e.g., at 603 of the +8D lens) and the end of the second peripheral zone 103 (at 601); E is the slope of the power distribution within the second peripheral optical zone 103 (e.g., between 601 and 602) and is a value determined by dividing B by W2. The metrics calculated for the improved multifocal lens with an aspherical curvature of -8D power can follow similar corresponding calculations as shown for the +8D lens in FIG. 6.

[0074] As shown in detail in FIG. 7, a power measurement table for an improved multifocal lens having an aspherical curvature shows that for powers in the range of +8D to -8D, the change in power (B1 and / or B2) within the second peripheral optical (distance) zone 103 (W2) may vary by less than 0.25D. Similarly, for powers between +8D and -8D, the change in power (B1 and / or B2) within this peripheral optical (distance) zone 103 (W2) may vary by less than 0.25D. For powers between +8D and -8D, the change in power (E) between the end of the first peripheral optical zone (such as 602) and the edge of the peripheral optical zone (such as 601) may be constant, for example, varying within the range of 0D to + / -0.2D. In some embodiments, the slope of the change in power within the second peripheral optical zone may be between + / -3D (e.g., approximately -3D, -2.9D, -2.8D, -2.7D, -2.6D, -2.5D, -2.4D, -2.3D, -2.2D, -2.1D, -2D, -1.9D, -1.8D, -1.7D, -1.6D, -1.5D, -1.4D, -1.3D, -1.2D, -1.1D, -1D, -0.9D, -0.8D, -0.7D, -0.6D, -0.5D, -0.4D, -0.3D, -0.2D, -0.1D, 0D, 0.1D, 0.2D, 0.3D, 0.4D, 0.5D, 0.6D, 0.7D, 0.8D, 0.9D, 1D, 1.1D, 1.2D, 1.3D, 1.4D, 1.5D, 1.6D, 1.7D, 1.8D, 1.9D, 2D, 2.1D, 2.2D, 2.3D, 2.4D, 2.5D, 2.6D, 2.7D, 2.8D, 2.9D, 3D).

[0075] Referring to FIG. 8, there is shown a power distribution metric and design dimensions of a multifocal contact lens having a spherical curvature included in a contact lens kit. The power distribution metric is for a multifocal contact lens with a spherical curvature, and the sample power distribution ranges from +8.0D to -8.0D lens power, with a high addition (e.g., +2.5D). The power metrics used to describe the multifocal lens with a spherical curvature are shown in FIG. 8 and can be as follows: D is the diameter of the central optical zone 101; W1 is the semi-chord diameter of the central optical zone 101 (D / 2) plus the width of the first peripheral optical zone 102; W2 is the width of the second peripheral optical zone 103; C is the addition power, which is calculated as the power difference between the central optical zone (e.g., at 703 of the +8D lens) and the end of the starting point of the second peripheral zone 103 (e.g., at 702 of the +8D lens); B1 is the power difference within the second peripheral optical zone 103 (e.g., between 701 and 702 of the +8D lens); B2 is the power difference within zone 103 (e.g., between 704 and 705 of the -8D lens); A is the calculated power difference between the central optical zone 101 (e.g., at 703 of the +8D lens) and the end of the second peripheral zone 103 (at 701); E is the slope of the power distribution within the second peripheral optical zone 103 (e.g., between 701 and 702) and is a value determined by dividing B by W2. The metrics calculated for a multifocal lens with a -8D spherical curvature power can follow similar corresponding calculations as shown for the +8D lens in FIG. 9.

[0076] As shown in detail in FIG. 9, the power metric table of the multifocal lens having a spherical curvature shows that for powers between +8D and -8D, the power change (B1 and / or B2) within the second peripheral optical zone 103 (W2) can vary in the range of +2.31D to -1.55D. For powers between +8D and -8D, the power change (A) between the edge of the central zone and the peripheral optical zone can vary in the range of 0.66D to 3.89D. For powers between +8D and -8D, the slope E of the power change within the second peripheral optical zone can be in the range of 1.68 to -1.25.

[0077] Referring to FIG. 10, there is shown a sample of the power distribution of a multifocal contact lens having an aspherical curvature (e.g., in a second peripheral optical zone) included in a contact lens kit. The sample power distribution of this exemplary kit ranges from +8.0D to -8.0D lens powers, with a high addition (e.g., +2.5D). In some embodiments, at least one of the multifocal contact lenses having an aspherical curvature (e.g., in a second peripheral optical zone) in the lens kit can be used to correct for distance refractive errors in the range of + / -8.0D, + / -10.0D, + / -15.0D, + / -20.0D, or any other reasonable lens power within this range. FIG. 11 shows a power distribution scale of a multifocal contact lens having an aspherical curvature included in the contact lens kit depicted in FIG. 10, where the sample power distribution ranges from +8.0D to -8.0D lens powers, with a high addition (e.g., +2.5D). The power metrics for describing the improved multifocal lens having an aspherical curvature have been previously described in FIG. 6. Comparing the power distribution of the sample multifocal lens having an aspherical curvature in the contact lens kit of FIG. 4, the multifocal lens of FIG. 10 uses an aspherical curvature (e.g., different from the aspherical curvature used by the multifocal lens in FIG. 4) to provide a non-constant power variation within at least one optical zone (e.g., the second peripheral optical zone 103), and this non-constant power distribution can be designed with an aspherical curvature to provide a consistent power distribution within a series of multifocal lenses in the lens kit.

[0078] Referring to FIG. 11, the slope (E) of the power variation within the second peripheral optical zone 103 in all sample multifocal lenses of the contact lens kit depicted in FIG. 10 is 1.0, in contrast to a slope of 0.2 for the multifocal lenses in the contact lens kit shown in FIG. 4 (FIG. 6).

[0079] Referring to FIG. 12, there is shown a sample of the power distribution of a multifocal contact lens having an aspherical curvature (e.g., in a second peripheral optical zone) included in a contact lens kit. The sample power distribution of this exemplary kit ranges from +8.0D to -8.0D lens powers, with a high addition (e.g., +2.5D). In some embodiments, at least one of the multifocal contact lenses having an aspherical curvature (e.g., in a second peripheral optical zone) in the lens kit can be used to correct for distance refractive errors in the range of + / -8.0D, + / -10.0D, + / -15.0D, + / -20.0D, or any other reasonable lens power within this range.

[0080] Figure 13 shows a power distribution scale of a multifocal contact lens with an aspherical curvature included in the contact lens kit depicted in Figure 12, where the sample power distribution ranges from +8.0D to -8.0D lens power, with a high addition (e.g., +2.5D). The power measurement for the improved multifocal lens with an aspherical curvature has been described previously in Figure 6. Comparing the power distributions of the sample multifocal lenses with an aspherical curvature in the contact lens kits shown in Figures 4 and 10, the multifocal lenses in the contact lens kit shown in Figure 12 can use at least one or more different aspherical curvatures to provide selected lens powers (e.g., +8.0D to +1.0D), which have a form of controlled power distribution (e.g., the slope of power change (E) in the second peripheral optical zone 103 is 1.0; Figure 13); and other selected powers in the kit (e.g., -8.0D to -1,0D), which have a different form of controlled power distribution (e.g., the slope of power change (E) in the second peripheral optical zone 103 is 0.2; Figure 13). The aspherical curvature for the power distribution of the optical zone of the improved multifocal lens in the contact lens kit can be selected to provide a controlled power distribution within any desired subset of multifocal lens powers and / or additions in any selected optical zone of any desired shape in the contact lens kit.

[0081] In some embodiments, the multifocal lens can form at least one lens of a lens kit for correcting presbyopia in presbyopic subjects with low, moderate, and / or high presbyopia. In some embodiments, the multifocal lens with an aspherical curvature can be used as a medium / high ADD, while the low ADD can be a multifocal lens with a spherical curvature.

[0082] In some embodiments, the multifocal lens with an aspherical curvature can form one lens of a lens system or kit for correcting presbyopia in presbyopic subjects, and the other lens of the system or kit can have a progressive power distribution (e.g., where at least one optical zone has a power distribution that forms a continuous power progression within the optical zone) or can have at least one optical zone with a spherical curvature or at least one curvature forming a non-coaxial optical zone (e.g., an optical zone where at least one focus is not focused on the optical axis of the multifocal lens) or at least one curvature forming a coaxial optical zone (e.g., an optical zone where at least one focus is focused on the optical axis of the multifocal lens).

[0083] In some embodiments, the multifocal lens with an aspherical curvature can form one lens of a lens system or kit for correcting presbyopia in presbyopic subjects, and the other lens of the system or kit can have at least one or more non-coaxial optical zones, or can form one or more off-axis foci in front of, above, behind the retina, or any combination thereof.

[0084] In some embodiments, a lens kit can include a multifocal lens that incorporates at least one optical zone formed by an improved curvature as disclosed herein and can achieve improved aberration control (e.g., coma, astigmatism, and higher-order aberrations) under a range of conditions, including: different vergences (e.g., far, intermediate, and / or near vergences), different pupil sizes (e.g., daytime or nighttime conditions), the presence of bright light at night (e.g., night driving), and / or different lens centrations on the eye (e.g., good centration, where the optical center of the lens can be located within 0.1 mm of the eye's visual axis) and / or with the lens eccentric with respect to the eye's visual axis (e.g., the lens is eccentric 0.1 mm or more, including 0.2 mm, 0.3 mm, 0.5 mm, 0.7 mm, and 1.0 mm or more), which can result from the interaction of lens geometry, lens material properties, and / or the eye characteristics and biometrics of the wearer under static (e.g., forward gaze) and / or dynamic conditions (e.g., saccadic gaze, eye movement, and blink). Aberration control can be determined during lens wear under the above conditions by applying mathematical and / or computational models that describe the average performance of the human eye (e.g., Liou-Brennan, Navarro et al., Atchison et al., Campbell model eyes). Optical performance metrics considered in the improved aberration control can be, for example, image contrast (e.g., calculated by the modulation transfer function (“MTF”) curve), Zernike aberration terms (e.g., defocus, coma, spherical aberration, astigmatism, trefoil), point spread functions (e.g., geometric and RMS point spread functions), and / or image simulation at the image plane (e.g., the retina).

[0085] In some embodiments, the optical performance metrics presented by the resulting improved multifocal lens kit incorporating at least one optical zone formed by an improved curvature as disclosed herein can be improved by 30%, 35%, 40%, 45%, 50%, 55%, 60%, 75%, 100%, 200%, 300%, 400%, or 500% or more relative to the optical performance metrics of an optical zone formed by a spherical curvature, or other reasonable numbers within this range (e.g., the MTF units of the second peripheral optical zone 103 for distance vision correction are improved by more than 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 90%, 100%, 110%, 120%, 130%, or other reasonable numbers within this range).

[0086] In some embodiments, the aberration control (e.g., measured in microns of coma aberration, diopters of astigmatism) presented by the resulting improved multifocal lens kit incorporating at least one optical zone formed by an improved curvature, as disclosed herein, can be improved by 100%, 250%, 500%, 750%, 1000% or more relative to the optical performance metric caused by an optical zone formed by spherical curvature, or other reasonable numbers within this range.

[0087] In some embodiments, the point spread functions (geometric and RMS point spread function variation ratios) presented by the resulting improved multifocal lens kit incorporating at least one optical zone formed by an improved curvature, as disclosed herein, can be more symmetric and uniform relative to the point spread functions of an optical zone formed by spherical curvature, by 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, or 60% more, or other reasonable values within this range. Examples:

[0088] A1. An ophthalmic lens, comprising: a central optical zone having a lens power combined therein that is at least greater than the positive power required to correct for a far - distance refractive error; a first peripheral optical zone having one or more zones with a combined power that is at least lower than that of the central optical zone, wherein at least one of the consecutive zones has a lower power than any previous zone; a second peripheral optical zone having a lens power combined therein that is at least the power required to correct for a far - distance refractive error; and at least one curvature forming any of the central optical zone and / or the first peripheral optical zone and / or the second peripheral optical zone is aspherical.

[0089] A2. The lens according to any one of embodiments A, wherein at least one curvature forming any of the central optical zone and / or the first peripheral optical zone and / or the second peripheral optical zone can be aspherical.

[0090] A3. The lens according to any one of embodiments A, wherein at least one curvature forming any of the central optical zone and / or the first peripheral optical zone and / or the second peripheral optical zone can at least partially correct for the higher - order aberrations of the lens.

[0091] A4. The lens according to any one of embodiments A, further comprising a lens system, wherein at least one lens can be used for the dominant or non - dominant eye of a presbyopic person.

[0092] A5. The lens according to any one of embodiments A, further comprising a lens kit, wherein at least one lens can be used to correct for a far - distance refractive error.

[0093] A6. The lens according to any one of embodiments A, wherein the refractive error can be in the range of + / - 5D, + / - 8D, + / - 10D, + / - 15D or + / - 20D.

[0094] A7. The lens as described in any one of Embodiment A further includes a lens kit, wherein at least one lens can be used to correct the presbyopia of a presbyopic person suffering from low, medium, and / or high presbyopia.

[0095] A8. The lens as described in any one of Embodiment A further includes a lens system for correcting presbyopia, wherein at least one lens can have a progressive power distribution or a non-concentric optical zone curvature.

[0096] A9. The lens as described in any one of Embodiment A further includes a lens kit for correcting presbyopia, wherein at least one lens can have a progressive distribution or at least one zone formed with a spherical curvature or at least one non-concentric optical zone curvature or at least one concentric optical zone curvature.

[0097] A10. For the lens as described in any one of Embodiment A, the diameter of the central optical zone can be between 0.25 mm and 4.0 mm (e.g., 0.2, 0.25, 0.3, 0.4, 0.5, 1.0, 1.25, 1.5, 1.75, 2.0, 2.25, 2.5, 2.75, 3.0, 3.25, 3.5, 3.75, or 4.0 mm).

[0098] A11. For the lens as described in any one of Embodiment A, the width of any zone incorporated in the first peripheral optical zone can be between 0.05 mm and 2.0 mm (e.g., 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.125, 0.15, 0.175, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, or 2.0 mm).

[0099] A12. For the lens as described in any one of Embodiment A, the width of the second peripheral optical zone can be between 0.05 mm and 5.0 mm (e.g., 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.125, 0.15, 0.175, 0.2, 0.3, 0.4, 0.5, 1.0, 1.25, 1.5, 1.75, 2.0, 2.25, 2.5, 2.75, 3.0, 3.25, 3.5, 3.75, 4.0, 4.25, 4.5, 4.75, or 5.0 mm).

[0100] A13. For the lens as described in any one of Embodiment A, the power of the central optical zone can be at least 0.25 D greater than the positive power required to correct the refractive error at a distance.

[0101] A14. The lens as described in any one of embodiments A, wherein at least one zone of the first peripheral optical zone can be at least 0.125 D less positive than the central optical zone, and wherein each successive zone is 0.125 D less positive than any previous zone.

[0102] A15. The lens as described in any one of embodiments A, wherein the power of the central optical zone and / or the power of at least one zone in the first peripheral optical zone and / or the second peripheral optical zone can form a substantially constant power distribution for any power or portion of the optical zone.

[0103] A16. The lens as described in any one of embodiments A, wherein the portion of the optical zone having a substantially constant power distribution can be 10% or more, 20% or more, 40% or more, 50% or more, or 75% or more within the power range of myopic power and / or hyperopic power within the range of + / - 8.0 D, or + / - 10.0 D or + / - 15.0 D.

[0104] A17. The lens as described in any one of embodiments A, wherein at least one curvature forming any zone in the central optical zone and / or the first peripheral optical zone and / or the second peripheral optical zone can be non - coaxial.

[0105] A18. The lens as described in any one of embodiments A, wherein at least one curvature forming any zone in the central optical zone and / or the first peripheral optical zone and / or the second peripheral optical zone can form on - axis and / or off - axis foci in front of, above, and / or behind the retinal plane.

[0106] A19. The lens as described in any one of embodiments A, wherein at least one curvature forming any zone in the central optical zone and / or the first peripheral optical zone and / or the second peripheral optical zone can form a spherical toroid.

[0107] A20. The lens as described in any one of embodiments A, wherein at least one curvature forming any zone in the central optical zone and / or the first peripheral optical zone and / or the second peripheral optical zone can form a non - spherical toroid.

[0108] A21. The lens as described in any one of embodiments A, wherein at least one curvature forming any zone in the central optical zone and / or the first peripheral optical zone and / or the second peripheral optical zone can form a non - rotationally symmetric lens.

[0109] A22. The lens as described in any one of embodiments A, wherein at least one curvature forming any zone in the central optical zone and / or the first peripheral optical zone and / or the second peripheral optical zone can form a ballast lens.

[0110] The lens as described in any one of Embodiment A, wherein at least one curvature forming any of the central optical zone and / or the first peripheral optical zone and / or the second peripheral optical zone can form an aspheric lens.

[0111] It should be understood that the above embodiments are cited by way of example, and the present invention is not limited to what is specifically shown and described above. On the contrary, the scope of the present disclosure includes combinations and sub - combinations of the various features described above, as well as variations and modifications thereof that would occur to those skilled in the art upon reading the foregoing description and that are not disclosed in the prior art.

Claims

1. An ophthalmic lens, comprising: A central optical zone having a combined lens power that is at least greater than the positive power required to correct for a refractive error at a distance; A first peripheral optical zone having a power in one or more zones that is at least lower than that of the central optical zone, wherein at least one of the contiguous zones has a power lower than any previous zone; A second peripheral optical zone having a lens power that is at least the power required to correct for the refractive error at a distance; And At least one curvature forming any of the central optical zone and / or the first peripheral optical zone and / or the second peripheral optical zone is aspherical.

2. The lens according to claim 1, wherein at least one curvature forming any of the central optical zone and / or the first peripheral optical zone and / or the second peripheral optical zone is aspherical.

3. The lens according to any one of the preceding claims, wherein at least one curvature forming any of the central optical zone and / or the first peripheral optical zone and / or the second peripheral optical zone at least partially corrects for higher order aberrations of the lens.

4. The lens according to any one of the preceding claims, further comprising a lens system, wherein at least one lens is for the dominant or non-dominant eye of a presbyopic patient.

5. The lens according to any one of the preceding claims, further comprising a lens kit, wherein at least one lens is for correcting the refractive error at a distance.

6. The lens according to claim 5, wherein the refractive error is in the range of + / -5D, + / -8D, + / -10D, + / -15D or + / -20D.

7. The lens according to any one of the preceding claims, further comprising a lens kit, wherein at least one lens is for correcting the presbyopia of a presbyopic patient having low, moderate and / or high presbyopia.

8. The lens according to any one of the preceding claims, further comprising a lens system for correcting presbyopia, wherein at least one lens has a progressive power distribution or an aspherical curvature of a non-coaxial optical zone.

9. The lens according to any one of the preceding claims, further comprising a lens kit for correcting presbyopia, wherein at least one lens has a progressive distribution or at least one zone formed with a spherical curvature or at least one non-coaxial optical zone curvature or at least one coaxial optical zone curvature.

10. The lens according to any one of the preceding claims, wherein the diameter of the central optical zone is between 0.25 mm and 4.0 mm (e.g., 0.2, 0.25, 0.3, 0.4, 0.5, 1.0, 1.25, 1.5, 1.75, 2.0, 2.25, 2.5, 2.75, 3.0, 3.25, 3.5, 3.75 or 4.0 mm).

11. The lens according to any one of the preceding claims, wherein the width of any zone incorporated in the first peripheral optical zone is between 0.05 mm and 2.0 mm (e.g., 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.125, 0.15, 0.175, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9 or 2.0 mm).

12. The lens according to any one of the preceding claims, wherein the width of the second peripheral optical zone is between 0.05 mm and 5.0 mm (e.g., 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.125, 0.15, 0.175, 0.2, 0.3, 0.4, 0.5, 1.0, 1.25, 1.5, 1.75, 2.0, 2.25, 2.5, 2.75, 3.0, 3.25, 3.5, 3.75, 4.0, 4.25, 4.5, 4.75 or 5.0 mm).

13. The lens according to any one of the preceding claims, wherein the power of the central optical zone is at least 0.25 D greater than the positive power required to correct the distance refractive error.

14. The lens according to any one of the preceding claims, wherein at least one zone of the first peripheral optical zone is at least 0.125 D less positive than the central optical zone, and wherein each successive zone is 0.125 D less positive than any previous zone.

15. The lens according to any one of the preceding claims, wherein the power of the central optical zone and / or at least one zone of the first peripheral optical zone and / or the second peripheral optical zone forms a substantially constant power distribution for any power or portion of the optical zone.

16. The lens according to claim 15, wherein the portion of the optical zone having a substantially constant power distribution can be within a range of + / −8.0 D, or + / −10.0 D or + / −15.0 D and is 10% or more, 20% or more, 40% or more, 50% or more, or 75% or more within the power range of myopia and / or hyperopia.

17. The lens according to any one of the preceding claims, wherein at least one of the curvatures forming any zone of the central optical zone and / or the first peripheral optical zone and / or the second peripheral optical zone is non - coaxial.

18. The lens according to any one of the preceding claims, wherein at least one of the curvatures forming any zone of the central optical zone and / or the first peripheral optical zone and / or the second peripheral optical zone forms on - axis and / or off - axis foci in front of, above, and / or behind the retinal plane.

19. The lens according to any one of the preceding claims, wherein at least one curvature forming any of the central optical zone and / or the first peripheral optical zone and / or the second peripheral optical zone forms a spherical toroid.

20. The lens according to any one of the preceding claims, wherein at least one curvature forming any of the central optical zone and / or the first peripheral optical zone and / or the second peripheral optical zone forms a non-spherical toroid.

21. The lens according to any one of the preceding claims, wherein at least one curvature forming any of the central optical zone and / or the first peripheral optical zone and / or the second peripheral optical zone forms an aspherical lens.

22. The lens according to any one of the preceding claims, further comprising a ballast.

23. The lens according to any one of the preceding claims, wherein the lens has a toric optical zone.

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