Presbyopia-correcting ophthalmic lenses with reduced visual impairment

Abstract

The intraocular lens (IOL) includes a lens body having an anterior surface and a posterior surface centered on an optical axis, and a gradual phase-step structure formed on the refractive surface profile of at least one of the anterior surface and the posterior surface, wherein at least one of the anterior surface and the posterior surface has an outer zone, an inner zone, and a transition zone continuously connecting the outer zone and the inner zone. The refractive surface profile of the outer zone provides a base refractive power, and the refractive surface profile of the inner zone provides an add refractive power. The gradual phase-step structure includes a first annular ridge structure in the inner zone and a second annular ridge structure extending radially from the transition zone to the outer zone.

Description

[Technical Field]

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS This application claims priority to and the benefit of U.S. Provisional Patent Application No. 63 / 486,567, filed February 23, 2023, which is hereby assigned to the assignee herein and expressly incorporated by reference in its entirety as if fully set forth below and for all applicable purposes. [Background technology]

[0002] The human eye, simply put, functions to provide vision by transmitting light through a clear outer portion called the cornea and focusing an image onto the retina by means of the lens. The quality of the focused image depends on many factors, including the size and shape of the eye and the transparency of the cornea and lens. When age or disease reduces the transparency of the lens, vision is impaired because less light can be transmitted to the retina. This damage to the eye's lens is medically known as a cataract. The accepted treatment for this condition is surgical removal of the lens and replacing its function with a presbyopia-correcting intraocular lens (PC-IOL).

[0003] PC-IOLs replace the eye's natural lens and are used in both refractive lens exchange and cataract surgery to correct refractive errors. Among them are extended depth of focus (EDOF) IOLs and diffractive multifocal IOLs. While the benefits of existing PC-IOLs are known, improvements in PC-IOL design continue to improve outcomes and benefit patients. Summary of the Invention [Means for solving the problem]

[0004] An aspect of the present disclosure provides an ophthalmic lens, such as an intraocular lens (IOL) or contact lens, including a lens body having an anterior surface and a posterior surface disposed about an optical axis, and a gradual phase-step structure formed on the refractive surface profile of at least one of the anterior surface or the posterior surface, wherein at least one of the anterior surface or the posterior surface has an outer zone, an inner zone, and a transition zone continuously connecting the outer zone and the inner zone. The refractive surface profile of the outer zone provides a base refractive power, and the refractive surface profile of the inner zone provides an add refractive power. The gradual phase-step structure includes a first annular ridge structure in the inner zone and a second annular ridge structure extending radially from the transition zone to the outer zone.

[0005] Aspects of the present disclosure also provide an ophthalmic lens, e.g., an intraocular lens (IOL), including a lens body having an anterior surface and a posterior surface disposed about an optical axis, and a gradual phase-step structure formed on the refractive surface profile of at least one of the anterior surface or the posterior surface, wherein the refractive surface profile and the gradual phase-step structure are configured to provide continuous vision, e.g., with a visual acuity of approximately 0.2 logMAR, in a defocus range between 0 diopters and -2.2 diopters.

[0006] Aspects of the present disclosure further provide an intraocular lens (IOL) including a lens body having an anterior surface and a posterior surface disposed about an optical axis, and a gradual phase-step structure formed on the refractive surface profile of at least one of the anterior surface or the posterior surface, wherein at least one of the anterior surface or the posterior surface has an outer zone, an inner zone, and a transition zone continuously connecting the outer zone and the inner zone. The refractive surface profile of the outer zone provides a base refractive power, and the refractive surface profile of the inner zone provides an add refractive power. The gradual phase-step structure includes a first annular ridge structure in the inner zone and a second annular ridge structure extending radially from the transition zone to the outer zone. The refractive surface profile and the gradual phase-step structure are configured to provide continuous vision, for example, with a visual acuity of approximately 0.2 logMAR in a defocus range between 0 diopters and -2.2 diopters.

[0007] So that the above-recited features of the present disclosure can be understood in detail, a more particular description of the present disclosure briefly summarized above can be had by reference to embodiments, some of which are illustrated in the accompanying drawings. It should be noted, however, that the accompanying drawings illustrate only some aspects of the present disclosure, which may be susceptible to other equally effective embodiments. [Brief explanation of the drawings]

[0008] [Figure 1A] FIG. 1A illustrates a top view of an intraocular lens (IOL), according to certain embodiments. [Figure 1B] FIG. 1B shows a side view of a portion of the IOL of FIG. 1A, in accordance with certain embodiments. [Figure 2A-2B] FIG. 2A illustrates a refractive surface profile of an anterior surface of an IOL according to certain embodiments, and FIG. 2B illustrates a surface profile of a gradual phase step structure on the anterior surface of the IOL of FIG. 2A according to certain embodiments. [Figure 3A] FIG. 3A illustrates the monocular visual acuity (VA) of an exemplary low visual disturbance (LVD) PC-IOL, according to certain embodiments. [Figure 3B-3D] 3B-3D show modulation transfer functions (MTFs) of exemplary low visual impairment (LVD) PC-IOLs, according to certain embodiments. [Figure 4] FIG. 4 illustrates an exemplary system for designing, configuring, and / or forming an IOL, according to certain embodiments. [Figure 5] FIG. 5 illustrates exemplary operations for forming an IOL, according to certain embodiments. DETAILED DESCRIPTION OF THE INVENTION

[0009] For ease of understanding, where possible, identical reference numerals will be used to designate identical elements common to the figures, and it is contemplated that elements and features of one embodiment may be beneficially incorporated in other embodiments without further recitation.

[0010] The embodiments described herein provide ophthalmic lenses, such as intraocular lenses (IOLs), having surface profiles that produce controlled changes in the phase shift of light waves passing through various regions of the IOL to extend depth of focus, as well as methods and systems for manufacturing the same. In certain embodiments, the lens surface of the IOL has a progressive phase-step structure in conjunction with an add power surface to produce a continuum of vision from distance to near. The presbyopia-correcting intraocular lenses (PC-IOLs) described herein can provide full-field performance (e.g., by maximizing depth of focus for near vision) without the use of diffractive structures, while minimizing visual impairments (VDs) such as halos. Other exemplary embodiments include contact lenses having the progressive phase-step structure described in conjunction with an add power surface to provide a continuum of vision from distance to near.

[0011] Non-diffractive presbyopia-correcting intraocular lens (PC-IOL) Figure 1A shows a top view of an intraocular lens (IOL) 100, according to certain embodiments. Figure 1B shows a side view of the IOL 100. The IOL 100 includes a lens body 102 and a haptic portion 104 coupled to a peripheral non-optical portion of the lens body 102.

[0012] The lens body 102 has an anterior surface 102A and a posterior surface 102P centered on the optical axis OA. The posterior surface 102P may have a smooth surface profile, for example, a smooth convex profile. On the anterior surface 102A, a gradual phase step structure is formed on the base surface profile of the anterior surface 102A. The anterior surface 102A includes an outer zone 106, an inner zone 108, and a transition zone 110 that continuously connects the outer zone 106 and the inner zone 108. The base surface of the outer zone 106 provides a base power appropriate for distance vision correction (assuming zero add power). The base surface of the inner zone 108 provides an add power appropriate for near vision correction. The transition zone 110 may have two or more subzones 110A and 110B. The gradual phase step structure may be formed on the anterior surface 102A in one or more of the subzones 110A and 110B of the transition zone 110. The gradual phase step structure produces different phase shifts in light waves passing through different regions or zones of the lens body 102. Constructive interference between light waves with different amounts of phase shift produces an extended depth of focus. Thus, the overall surface profile Z of the front surface 102A A (r) (described as the sag of a point on the front surface 102A at a radial distance r from a point on the front surface 102A at the optical axis OA) is a function of the refractive surface profile Z of the gradual phase step structure, as described in detail below. RP (r) and surface profile Z PS The sum of (r), Z A (r)=Z RP (r)+Z PS (r).

[0013] Although in the examples described herein the refractive surface profile and gradual phase step structure are formed only on the anterior surface 102A of the lens body 102, the refractive surface profile and gradual phase step structure may be formed on the posterior surface 102P of the lens body 102, or on both the anterior surface 102A and posterior surface 102P of the lens body 102.

[0014] It should be noted that the shape and curvature of the lens body 102 are shown for illustrative purposes only, and that other shapes and curvatures are within the scope of this disclosure. For example, the lens body 102 shown in Figure 1B has a biconvex shape. In other examples, the lens body 102 can have a plano-convex, convex-concave, or plano-concave shape.

[0015] The lens body 102 can be made of biocompatible materials such as modified poly(methyl methacrylate) (PMMA), modified PMMA hydrogel, hydroxyethyl methacrylate (HEMA), PVA hydrogel, other silicone polymer materials, and hydrophobic acrylic polymer materials, such as AcrySof® and Clareon® materials available from Alcon, Inc., Fort Worth, Texas. The lens body 102 has a diameter between about 4.5 mm and about 7.5 mm, e.g., about 6.0 mm.

[0016] The haptic portion 104 is coupled (e.g., adhesively or welded) to the peripheral portion of the lens body 102 or is molded with a portion of the lens body 102, thereby extending radially from the lens body 102 and engaging an outer peripheral wall of the lens capsule of the eye to hold the lens body 102 in a desired position of the eye. It includes radially extending struts (also called "haptics") 104A and 104B. The haptics 104A and 104B can be made of modified poly(methyl methacrylate) (PMMA), modified PMMA hydrogel, hydroxyethyl methacrylate (HEMA), PVA hydrogel, other silicone polymer materials, and biocompatible materials such as hydrophobic acrylic polymer materials, e.g., AcrySof® and Clareon® materials available from Alcon, Inc., Fort Worth, Texas. The haptics 104A and 104B typically have radially outward ends that define arcuate terminal portions. The terminal portions of the haptics 104A and 104B can be spaced apart by a length between about 6 mm and about 22 mm, e.g., about 13 mm. The haptics 104A and 104B have a specific length such that, when in contact with the equatorial region of the lens capsule after insertion, the terminal portions create a slight engagement pressure. FIG. 1A shows one exemplary configuration of the haptics 104A and 104B, but any plate haptic or other type of haptic can also be used.

[0017] FIG. 2A shows the refractive surface profile Z RP (r) of the front surface 102A. The refractive surface profile Z RP (r) includes a refractive surface profile Z Zone1 (r) (also called "zone 1", 0 ≦ r < r5) of the inner zone 108 that provides an additional refractive power for near vision correction, and a refractive surface profile Z Zone4 (r) (also called "zone 4", r7 ≦ r < r 10 ) of the outer zone 106 that provides a basic refractive power for distance vision correction. The inner zone 108 having the refractive surface profile Z Zone1 (r), and the refractive surface profile Z Zone4The outer zone 106 having (r) is connected continuously to the refractive surface profile Z via the transition zone 110 (r5≦r<r7). Zone2 (r) and Z Zone3 (r) are connected continuously. The transition zone 110 of the front surface 102A can include two or more zones including a sub-zone 110A (also called "zone 2", r5≦r<r6) and a sub-zone 110B (also called "zone 3", r6≦r<r7) surrounding the sub-zone 110A. The refractive surface profile Z Zone1 (r), Z Zone2 (r), Z Zone3 (r), and Z Zone4 (r) are caused by adding sag offsets D2, D3, and D4 to the refractive surface profile Z so that there is no discontinuity at the boundary between adjacent zones. For example, the refractive surface profile Z RP (r) can be defined as follows. RP (r) can be defined as follows. [Number] Wherein the refractive surface profile Z Zone1 (r), Z Zone2 (r), Z Zone3 (r), and Z Zone4 (r) are as follows: [Number] are defined as such. The curvature c1 and the conic constant k1 are determined based on the additional refractive power desired for the inner zone 108. The coefficients c4 and k4 are determined based on the basic refractive power for the outer zone 106. The transition zone parameters c2, k2, c3, and k3 are determined by optimizing the design for better visual acuity (VA) performance. By optimizing those refractive zone parameters in conjunction with the progressive phase structure, a smooth and continuous VA performance between approximately -1.0 diopter of intermediate vision and approximately -2.0 diopter of near vision can be provided by the embodiments herein. The coefficients A4 and A6 are the fourth and sixth order aspheric coefficients.

[0018] The outer radius r5 of the inner zone 108 can be between about 0.95 mm and about 1.5 mm, for example, about 1.1 mm. The outer radius r6 of the subzone 110A of the transition zone 110 can be between about 1.0 mm and about 1.5 mm, for example, about 1.25 mm. The outer radius r7 of the subzone 110B of the transition zone 110 can be between about 1.25 mm and about 2.05 mm, for example, about 1.3 mm. Base Profile Z Base (r)=Z Zone4 The radius of curvature (1 / c4) of (r) (also called the "base radius") can be between about 5.5 mm and about 95 mm. Refractive surface profile Z Zone1 The radius of curvature (1 / c1) of (r) and the refractive surface profile Z Zone3 The radius of curvature (1 / c3) of (r) can be between about the base radius minus 10 mm and about the base radius. Zone2 The radius of curvature (1 / c2) of (r) can be between about the base radius and about the base radius plus 10 mm, which is the refractive surface profile Z Zone3 (r) is greater than the radius of curvature (1 / c3). The conic constants k1, k2, k3, and k4 can be between -100 and +100, between -50 and +50, between -50 and +5, and between -2500 and +2500, respectively. The coefficient A4 is -5.0 x 10 -4 mm -3 to +5.0×10 -4 mm -3 The coefficient A6 can be between -5.0 x 10 -4 mm -5 to +5.0×10 -4 mm -5 It can be between.

[0019] FIG. 2B shows the surface profile Z of the gradual phase step structure on the front surface 102A. PS (r) shows the surface profile Z PS (r) includes the incremental steps described as follows:

number

[0020] As shown in FIG. 2B, the progressive phase step structure includes two annular ridge structures, namely, a first annular ridge structure extending radially from r = r1 (within the inner zone 108) to r = r4 (within the inner zone 108), and a second annular ridge structure extending radially from r = r6 (at the boundary between the sub - zones 110A and 110B within the transition zone 110) to r = r9 (within the outer zone 106). The first annular ridge structure increases in height radially from r = r1 to r = r2 and decreases in height radially from r = r3 to r = r4 which is smaller than r = r5 (at the boundary between the inner zone 108 and the transition zone 110). The second annular ridge structure increases in height radially from r = r6 (at the boundary between the sub - zones 110A and 110B) to r = r7 (at the boundary between the transition zone 110 and the outer zone 106) and decreases in height radially from r = r8 to r = r9.

[0021] Moving radially outward from the optical axis OA, four phase - shift steps may occur. Constructive interference between light waves having various amounts of phase shift results in an extended depth of focus.

[0022] The ranges of the parameters Δ1, Δ2, Δ3, Δ4, r1, r2, r3, r4, r8, r9, and r 10 are shown below.

[0023] [[ID=**********]]

Table 1

[0024] FIG. 3A shows the surface profile Z shown in FIGS. 2A and 2B measured in LogMAR (logarithm of minimum angle of resolution) scores. RP (r)+Z PS Figure 1 shows the monocular visual acuity (VA) of an exemplary low visual impairment (LVD) PC-IOL with (r). A 0 logMAR score corresponds to a score of 20 / 20 on the Snellen chart, or a spatial resolution (also called "spatial frequency") of 100 lp / mm (line pairs per millimeter). A 0.4 logMAR score corresponds to a score of 20 / 50 on the Snellen chart, or 40 lp / mm. Monocular VA was assessed using a 3 mm (photopic) aperture to determine the depth of focus (also called "defocus") of the lens.

[0025] In Figure 3A, the monocular VA 302 of a typical monofocal IOL (producing a single focus) and the monocular VA 304 of a typical EDOF IOL (producing a single elongated focus) are shown, along with simulated results 306 of the monocular VA of an exemplary LVD PC-IOL. The monocular VA 304 of the typical EDOF IOL exhibits an extended depth of focus compared to the monocular VA 302 of the typical monofocal IOL. The monocular VA 306 of the exemplary LVD PC-IOL exhibits an extended depth of focus similar to the monocular VA 304 of the typical EDOF IOL, but exhibits significant enhancement of VA at intermediate distances (approximately -1.5 diopters) and near distances (approximately -2 diopters) compared to the typical EDOF IOL. As can be seen in FIG. 3A, the exemplary LVD PC-IOL exhibits a continuous visual field range from distance to near (i.e., VA from distance to near vision of -1.8 diopters is greater than or better than 0.1 logMAR, and VA from distance vision of 0 diopters to near vision of -2.2 diopters is greater than 0.2 logMAR).

[0026] 3B, 3C, and 3D are graphs showing the surface profile Z shown in FIGS. 2A and 2B. RP (r)+Z PSFigure 1 shows the modulation transfer function (MTF) of an exemplary low visual impairment (LVD) PC-IOL with (r), evaluated at focal planes of 100 lp / mm (equivalent to a VA of 20 / 20), 67 lp / mm (equivalent to a VA of 20 / 30), and 50 lp / mm (equivalent to a VA of 20 / 40), respectively.

[0027] System for designing IOLs 4 illustrates an exemplary system 400 for designing, configuring, and / or forming an IOL, such as the LVD PC-IOL described herein. As shown, system 400 includes, but is not limited to, a control module 402, a user interface display 404, an interconnect 406, an output device 408, and at least one I / O device interface 410 that may allow various I / O devices (e.g., keyboard, display, mouse device, pen input, etc.) to be connected to system 400.

[0028] The control module 402 includes a central processing unit (CPU) 412, a memory 414, and storage 416. The CPU 412 may read and execute programming instructions stored in the memory 414. Similarly, the CPU 412 may read and store application data residing in the memory 414. The interconnect 406 transmits the programming instructions and application data between the CPU 412, the I / O device interface 410, the user interface display 404, the memory 414, the storage 416, the output devices 408, etc. The CPU 412 may represent a single CPU, multiple CPUs, a single CPU with multiple processing cores, etc. Additionally, in particular embodiments, the memory 414 represents volatile memory, such as random access memory. Furthermore, in particular embodiments, the storage 416 may be non-volatile memory, such as a disk drive, a solid-state drive, or a collection of storage devices distributed across multiple storage systems.

[0029] As shown, storage 416 includes input parameters 418, which may include any of the parameters used as inputs in the equations provided herein (e.g., the equations described in connection with FIGS. 2A and 2B). The input parameters 418 include the base power and add power of the lens. Memory 414 includes a calculation module 420 for calculating control parameters such as the outer radii of the various zones and the step height of the surface profile of the lens surface (e.g., the anterior surface). Additionally, memory 414 includes input parameters 422.

[0030] In certain embodiments, input parameters 422 correspond to input parameters 418, or at least a subset thereof. In certain embodiments, during calculation of the control parameters, input parameters 422 are retrieved from storage 416 and executed in memory 414. In such examples, calculation module 420 includes executable instructions for calculating the control parameters based on input parameters 422. In certain other embodiments, input parameters 422 correspond to parameters received from a user through user interface display 404. In such embodiments, calculation module 420 includes executable instructions for calculating the control parameters based on information received from user interface display 404.

[0031] In certain embodiments, the calculated control parameters are output via output device 408 to a lens manufacturing system configured to receive the control parameters and form a lens accordingly. In other certain embodiments, system 400 itself represents at least a portion of a lens manufacturing system. In such embodiments, control module 402 then causes hardware components (not shown) of system 400 to form a lens in accordance with the control parameters. Details of lens manufacturing systems are known to those skilled in the art and are omitted here for the sake of brevity.

[0032] How the IOL is formed 5 illustrates exemplary operations 500 for forming an IOL (e.g., IOL 100). In some embodiments, step 510 of operations 500 is performed by one system (e.g., system 400) and step 520 is performed by a lens manufacturing system. In other embodiments, both steps 510 and 520 are performed by a lens manufacturing system.

[0033] In step 510, control parameters (e.g., outer radii of various zones and step heights of the surface profile of the lens surface (e.g., the front surface)) are calculated based on input parameters (e.g., the base power and add power of the lens). The calculations performed in step 510 are based on one or more of the embodiments described herein. Various optimization techniques or algorithms can be used to select appropriate outer radii for various zones and step heights of the surface profile of the lens surface (e.g., the front surface). For example, a method can be used to numerically minimize an error function to calculate the difference between the target visual acuity and the achieved visual acuity by changing the design parameters.

[0034] In step 520, an IOL (e.g., IOL 100) is formed based on the calculated control parameters (e.g., the outer radii of the various zones and the step heights of the anterior surface profile of the lens) using appropriate methods, systems, and devices typically used in lens manufacturing, as known to those skilled in the art.

[0035] The embodiments described herein provide a presbyopia-correcting IOL that provides continuous vision from distance to near while avoiding or at least reducing the introduction of visual disturbances (e.g., halos, glare) more commonly associated with diffractive presbyopia-correcting IOLs. By providing continuous vision from distance to near, exemplary embodiments of low visual disturbance PC-IOLs may, in some cases, provide a greater depth of focus than some other EDOF IOLs. By avoiding visual disturbances (VDs) such as halos or glare, reductions in visual acuity and contrast sensitivity may also be avoided.

[0036] While the foregoing relates to embodiments of the present disclosure, other and further embodiments of the disclosure may be devised without departing from the basic scope thereof, which scope is determined by the following claims.

Claims

1. An ophthalmic lens, a lens body having a front surface and a rear surface disposed about an optical axis; a gradual phase step structure formed on a refractive surface profile of at least one of the front surface or the rear surface, the refractive surface profile having an outer zone, an inner zone, and a transition zone continuously connecting the outer zone and the inner zone; and Including, the refractive surface profile of the outer zone provides a base power; the refractive surface profile of the inner zone provides add power in the inner zone; The gradual phase step structure is a first annular raised structure within the inner zone; and a second annular ridge structure extending radially from the transition zone to the outer zone; 1. An ophthalmic lens comprising:

2. 10. The ophthalmic lens of claim 1, wherein the refractive surface profile and the gradual phase step structure are configured to provide continuous vision with a visual acuity of approximately 0.2 log MAR at defocus between 0 diopters and -2.2 diopters.

3. The transition zone includes a first subzone and a second subzone surrounding the first subzone. The ophthalmic lens of claim 1 , wherein the radius of curvature of the refractive surface profile of the first subzone is greater than the radius of curvature of the refractive surface profile of the second subzone.

4. the first annular raised structure radially increasing in height from a first radial distance from the optical axis to a second radial distance from the optical axis and radially decreasing in height from a third radial distance from the optical axis to a fourth radial distance from the optical axis; The ophthalmic lens of claim 3 , wherein the fourth radial distance is less than a fifth radial distance from the optical axis at a boundary between the inner zone and the transition zone.

5. the second annular raised structure radially increases in height from a sixth radial distance from the optical axis to a seventh radial distance from the optical axis and radially decreases in height from an eighth radial distance from the optical axis to a ninth radial distance from the optical axis; the sixth radial distance is at the boundary between the first subzone and the second subzone; The ophthalmic lens of claim 4 , wherein the seventh radial distance is at the boundary between the transition zone and the outer zone.

6. The ophthalmic lens of claim 1 , wherein the lens body comprises a hydrophobic acrylic polymer material.

7. The ophthalmic lens of claim 1 , further comprising one or more haptics coupled to the lens body.

8. a lens body having a front surface and a rear surface disposed about an optical axis; a gradual phase step structure formed on a refractive surface profile of at least one of the front surface or the rear surface; and Including, An ophthalmic lens, wherein said refractive surface profile and said gradual phase step structure are configured to provide continuous vision with acuity better than 0.2 log MAR in a defocus range between 0 diopters and -2.2 diopters.

9. At least one of the front surface or the rear surface is an outer zone in which the refractive surface profile provides a base power; an inner zone in which the refractive surface profile provides add power; a transition zone continuously connecting the outer zone and the inner zone; Including, The gradual phase step structure is a first annular raised structure within the inner zone; and a second annular ridge structure extending radially from the transition zone to the outer zone; 9. The ophthalmic lens of claim 8, comprising:

10. the transition zone includes a first subzone and a second subzone surrounding the first subzone; 10. The ophthalmic lens of claim 9, wherein the radius of curvature of the refractive surface profile of the first sub-zone is greater than the radius of curvature of the refractive surface profile of the second sub-zone.

11. the first annular raised structure radially increasing in height from a first radial distance from the optical axis to a second radial distance from the optical axis and radially decreasing in height from a third radial distance from the optical axis to a fourth radial distance from the optical axis; The ophthalmic lens of claim 10 , wherein the fourth radial distance is less than a fifth radial distance from the optical axis at a boundary between the inner zone and the transition zone.

12. the second annular raised structure radially increases in height from a sixth radial distance from the optical axis to a seventh radial distance from the optical axis and radially decreases in height from an eighth radial distance from the optical axis to a ninth radial distance from the optical axis; the sixth radial distance is at the boundary between the first subzone and the second subzone; The ophthalmic lens of claim 11 , wherein the seventh radial distance is at the boundary between the transition zone and the outer zone.

13. The ophthalmic lens of claim 9 , wherein the lens body comprises a hydrophobic acrylic polymer material.

14. The ophthalmic lens of claim 9 , further comprising one or more haptics coupled to the lens body.

15. a lens body having a front surface and a rear surface disposed about an optical axis; a gradual phase step structure formed on a refractive surface profile of at least one of the front surface or the rear surface, the refractive surface profile having an outer zone, an inner zone, and a transition zone continuously connecting the outer zone and the inner zone; Including, the refractive surface profile of the outer zone provides a base power; the refractive surface profile of the inner zone provides add power; The gradual phase step structure is a first annular raised structure within the inner zone; and a second annular ridge structure extending radially from the transition zone to the outer zone; Including, An intraocular lens (IOL) wherein the refractive surface profile and the gradual phase step structure are configured to provide continuous vision with acuity better than 0.2 log MAR in a defocus range between 0 diopters and -2.2 diopters.

16. the transition zone includes a first subzone and a second subzone surrounding the first subzone; 16. The IOL of claim 15, wherein the radius of curvature of the refractive surface profile of the first subzone is greater than the radius of curvature of the refractive surface profile of the second subzone.

17. the first annular raised structure radially increasing in height from a first radial distance from the optical axis to a second radial distance from the optical axis and radially decreasing in height from a third radial distance from the optical axis to a fourth radial distance from the optical axis; 17. The IOL of claim 16, wherein the fourth radial distance is less than a fifth radial distance from the optical axis at a boundary between the inner zone and the transition zone.

18. the second annular raised structure radially increases in height from a sixth radial distance from the optical axis to a seventh radial distance from the optical axis and radially decreases in height from an eighth radial distance from the optical axis to a ninth radial distance from the optical axis; the sixth radial distance is at the boundary between the first subzone and the second subzone; 18. The IOL of claim 17, wherein the seventh radial distance is at the boundary between the transition zone and the outer zone.

19. The IOL of claim 15 , wherein the lens body comprises a hydrophobic acrylic polymer material.

20. The IOL of claim 15 further comprising one or more haptics coupled to the lens body.

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