Full depth-of-focus intraocular lens

Abstract

To provide a system and a method for providing depth-of-focus extension that provides a Full Depth of Focus (FDoF) continually from a near distance to an infinite distance.SOLUTION: An ophthalmic lens comprises an anterior surface and a posterior surface. At least one of the anterior and posterior surfaces includes a first surface region corresponding to a photopic aperture of a pupil, and a second surface region corresponding to a difference between the photopic aperture and a mesopic aperture of the pupil. A first microstructure pattern is formed in the first surface region, and introduces a phase perturbation into an optical path of incoming light such that a full depth of focus for photopic vision is provided.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates generally to ophthalmic lenses, and more particularly to presbyopia-correcting full depth of focus ophthalmic lenses. [Background technology]

[0002] The human eye includes a cornea and a lens that are intended to focus light entering the eye's pupil onto the retina. However, the eye can exhibit a variety of refractive errors that result in the light not being properly focused onto the retina, which can result in reduced visual acuity. Ocular aberrations can range from relatively simple spherical and cylindrical errors that cause myopia, hyperopia, or regular astigmatism, to more complex refractive errors that can cause, for example, halos and starbursts in a person's vision.

[0003] Many procedures have been used over the years to correct various ocular aberrations. These procedures include spectacles, contact lenses, corneal refractive surgery (e.g., Laser Assisted In Situ Keratomileusis (LASIK) or corneal transplants), and intraocular lenses (IOLs). The diagnosis and specification of spherocylindrical spectacles and contact lenses for the treatment of myopia, hyperopia, and astigmatism are well established.

[0004] Presbyopia refers to a condition in which a person's eyes lose the ability to see objects clearly at close range. Ophthalmic lenses with multifocal capabilities have been developed to help patients focus on objects at relatively close range.

[0005] In particular, IOLs have been developed that have multifocal capabilities, allowing the patient to focus simultaneously on two or three focal planes, but multifocal IOLs typically cannot provide full vision from near to infinity.

[0006] Additionally, IOLs with extended depth of focus (EDF) capabilities have been developed. However, the extended depth of focus is too limited to fully correct a patient's presbyopia. Thus, there is a need for a system and method that provides an extended depth of focus that provides a full depth of focus (FDoF) continuously from near to infinity. Summary of the Invention [Means for solving the problem]

[0007] In certain embodiments, an ophthalmic lens includes an anterior surface and a posterior surface, at least one of the anterior surface and the posterior surface including a first surface region corresponding to a photopic aperture of a pupil and a second surface region corresponding to a difference between the photopic aperture and an intermediate adapting aperture of the pupil, and a first microstructure pattern formed on the first surface region, the first microstructure pattern introducing a phase perturbation into an optical path of incident light to provide full depth of focus for photopic vision.

[0008] In certain embodiments, the second surface region may have optical power. Alternatively, the second microstructure pattern may be formed on the second surface region. In certain embodiments, the second microstructure pattern may include bifocal or trifocal diffractive structures.

[0009] For a more complete understanding of the present invention, and the features and advantages thereof, reference is now made to the following descriptions taken in conjunction with the accompanying drawings, in which: [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a diagram of an exemplary IOL. [Diagram 2] 1 is a diagram of different pupil apertures. [Figure 3A-3B] 1 shows diagrams of through-focus energy distributions at a photopic aperture having distance-primary and near-primary characteristics, respectively. [Figure 4A-4B] The through-focus images at the photopic aperture corresponding to the diagrams shown in Figures 3A and 3B are shown, respectively. [Figure 5A-5B]Figure 5A is a cross-sectional view of a photopic microstructure for a phase perturbation with optical power beyond the photopic aperture, and Figure 5B shows a diagram of the through-focus energy distribution at the intermediate accommodation aperture corresponding to the microstructure shown in Figure 5A compared to the through-focus intermediate accommodation energy distribution corresponding to a typical monofocal lens. [Figure 6A-6B] The through-focus images at an intermediate accommodating aperture and a typical prime lens corresponding to the microstructure shown in FIG. 5A are shown, respectively. [Figure 7A-7B] Figure 7A shows a cross-sectional view of a diffractive microstructure for phase perturbation including a bifocal diffractive microstructure beyond the photopic aperture. Figure 7B shows a diagram of the through-focus energy distribution at the intermediate accommodation aperture corresponding to the microstructure shown in Figure 7A compared to the through-focus intermediate accommodation energy distribution corresponding to a typical bifocal lens. [Figure 8A-8B] 7B and 7C show the through-focus images in an intermediate accommodation aperture and a typical bifocal lens, respectively, corresponding to the microstructure shown in FIG. 7A. [Figure 9A-9B] Figure 9A shows a cross-sectional view of a diffractive microstructure for phase perturbation including a trifocal diffractive microstructure beyond the photopic aperture. Figure 9B shows a diagram of the through-focus energy distribution at the intermediate accommodation aperture corresponding to the microstructure shown in Figure 9A compared to the through-focus intermediate accommodation energy distribution corresponding to a typical trifocal lens. [Figure 10A-10B] 9B and 9C show the through-focus images in an intermediate accommodating aperture and a typical trifocal lens, respectively, corresponding to the microstructure shown in FIG. 9A. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Exemplary embodiments relate to ophthalmic devices such as IOLs and contact lenses. The following description is presented to enable one of ordinary skill in the art to make and use the invention and is provided in the context of a patent application and its requirements. Various modifications of the exemplary embodiments, general principles and features described herein will be readily apparent. Exemplary embodiments are primarily described in terms of specific methods and systems provided in specific implementations. However, the methods and systems work effectively with other implementations. For example, the methods and systems are primarily described in terms of IOLs. However, the methods and systems may also be used with contact lenses and spectacles.

[0012] In the following description, details are given by way of example to facilitate explanation of the disclosed subject matter, but it should be apparent to those skilled in the art that the disclosed embodiments are illustrative and do not encompass all possible embodiments.

[0013] As used herein, hyphenated forms of a reference number refer to a specific instance of an element, and non-hyphenated forms of a reference number refer to a generic element. Thus, for example, device "12-1" refers to an instance of a class of devices collectively referred to as device "12," which generally refers to any one of the devices referred to as device "12."

[0014] After cataract treatment or replacement of a person's crystalline lens with a conventional monofocal IOL, the patient's vision becomes presbyopic. Conventional solutions require a multifocal intraocular lens (MIOL) design or an extended depth of focus (EDF) design. Some bifocal IOLs can provide the patient with good vision at distance and near simultaneously. However, patients implanted with such bifocal lenses typically have unsatisfactory mid-distance vision. When using a bifocal IOL with an additional refractive power for the mid-distance range, better mid-distance vision may be obtained, but near vision is worse. Certain trifocal IOLs may provide the patient with some distance, mid-distance, and near vision, despite the lack of continuity of vision from distance to near. A typical EDF IOL limits the depth of focus to mid-distance vision, but may still compromise the near vision of the patient with the EDF IOL. Thus, as mentioned above, conventional multifocal IOLs cannot provide a full field of vision correcting presbyopia from near to infinity.

[0015] As described in more detail, full depth of focus IOLs are disclosed that correct presbyopia and provide full vision from near to infinity. The full depth of focus IOLs disclosed herein may provide highly efficient light energy usage, indicating that the IOL is resistant to potential photohazards. The full depth of focus IOLs disclosed herein may be implemented using refractive, bifocal and trifocal designs in areas beyond the photopic aperture, and can provide vision approximating monofocal, bifocal or trifocal intermediate adaptation vision. The full depth of focus IOLs disclosed herein may restore full vision following replacement of a person's crystalline lens.

[0016] A diffractive ophthalmic lens, such as the full depth of focus IOL disclosed herein, may be configured based on an optical aperture. The ophthalmic lens may have an anterior surface, a posterior surface, and at least one diffractive structure including a plurality of echelettes. The diffractive structure may be located on the anterior or posterior surface. The diffractive structure may provide the ophthalmic lens with a presbyopia-correcting full depth of focus in the photopic aperture while providing various types of performance characteristics in the intermediate accommodation aperture through different embodiments of the diffractive structure.

[0017] For example, a diffractive structure placed at the photopic aperture may provide various photopic through-focus performance (e.g., distance-dominant, near-dominant, or any other desired performance characteristic). A diffractive structure placed at the photopic aperture may be combined with a second diffractive structure in a region beyond the photopic aperture and within the intermediate accommodation aperture. For example, the second diffractive structure may be null, meaning that the second diffractive structure provides only refractive performance and provides monofocal-like through-focus performance to the intermediate accommodation aperture of the ophthalmic lens. In a further example, the second diffractive structure may be a bifocal structure and provide bifocal-like through-focus performance to the intermediate accommodation aperture of the ophthalmic lens. In yet another example, the second diffractive structure may be a trifocal structure and provide trifocal-like through-focus performance to the intermediate accommodation aperture of the ophthalmic lens.

[0018] Referring now to the drawing of FIG. 1, IOL 101 may represent any type of IOL used in ophthalmology. As shown, IOL 101 includes an optic zone 110 (also referred to herein simply as the "optic") and two haptics 112-1, 112-2, shown for convenience in an exemplary configuration. In various implementations, IOL 101 may include different types and numbers of haptics 112. In some implementations, IOL 101 may not have haptics. The materials used for optic zone 110 and haptics 112 may be different. For example, IOL 101 may be an unfolded rigid IOL with optic zone 110 including, for example, a polymethylmethacrylate (PMMA) lens. In some implementations, IOL 101 may be a flexible IOL and optic zone 110 may include various materials (e.g., silicone, hydrophobic acrylic, hydrophilic acrylic, hydrogel, collagen copolymer, or combinations thereof). In the IOL 101, the haptics 112 may comprise a variety of materials, such as polypropylene, polymethylmethacrylate (PMMA), hydrophobic acrylic, hydrophilic acrylic, silicone, or combinations thereof. The optic zone 110 may be designed to have a specified optical power or may be designed as a multifocal element having multiple optical powers.

[0019] In particular, the optical zone 110 may be implemented with a full depth of focus IOL that corrects presbyopia and provides full vision from near to infinity. Thus, the present disclosure is directed to a microstructure incorporated into one surface of a normal refractive monofocal IOL optic. The microstructure is formed as a pattern in the same material as the base IOL optic itself. The microstructure introduces a phase perturbation into the optical path of the incident photons that results in a very long extension of the presbyopia correcting depth of focus characteristic of the IOL optic. For example, the depth of focus is continuously extended from far or infinity to near distances. The phase perturbation may be restricted to a central region of the lens aperture to provide the patient with full depth of field photopic vision, as described by the aperture in FIG. 2 below.

[0020] The phase perturbation may be distributed in many discontinuous concentric regions and may be different in different regions in the IOL aperture (see FIG. 2). Thus, a full depth of focus IOL may provide pupil size dependent performance to meet the different requirements of photopic and intermediate adapted vision.

[0021] Reference is now made to Figure 2. Figure 2 shows a diagram of a pupil eyepiece aperture 200. The photopic aperture 202 is a light-adapted aperture that is adapted to light under bright conditions, e.g., daylight conditions, or approximately 3 candelas per square meter (cd / m 2 ) and above. The intermediate adaptation aperture 204 is larger than the photopic adaptation aperture 202 and exhibits a pupil aperture under dim conditions, e.g., in moonlight, or at approximately 3 cd / m 2 and about 0.01 cd / m 2 2 illustrates the pupil aperture at ambient light intensities between 202 and 204. As described in more detail below, the full depth of focus IOLs disclosed herein may be implemented using microstructured surface patterns formed in the material of the optical zone 110 at locations corresponding to the photopic aperture 202 and the intermediate accommodation aperture 204.

[0022] As described, phase perturbations in the photopic aperture of a full depth of field IOL may provide presbyopia-corrected full depth of focus photopic vision. Figures 3A and 3B illustrate two types of photopic energy through focal distributions resulting from two different types of phase perturbation designs, which are described and shown in detail below in Figures 7A and 9A, respectively.

[0023] Reference is now made to FIG. 3A, which illustrates a through-focus energy diagram 300-1 versus depth of focus. In diagram 300-1, photon energy is plotted against defocus depth to illustrate how photon energy is distributed from far to near distances. In particular, it can be seen that diagram 300-1 illustrates a far-distance principal energy curve that provides photopic vision with a continuous depth of focus from far to near distances (see also FIG. 4A).

[0024] Reference is now made to FIG. 3B, which illustrates a through-focus energy diagram 300-2 versus depth of focus. In diagram 300-2, photon energy is plotted against defocus depth to illustrate how photon energy is distributed from far to near distances. In particular, it can be seen that diagram 300-2 illustrates a near-distance principal energy curve that provides photopic vision with a continuous depth of focus from far to near distances (see also FIG. 4B).

[0025] Referring now to Figure 4A, Figure 4A shows through-focus character chart image 400-1 for a lens design corresponding to through-focus energy diagram 300-1. The five chart images in Figure 4A each correspond to a defocus distance in Table 1.

[0026] [Table 1]

[0027] The character chart images in Figure 4A (chart image 402-far, chart image 404-far-middle, chart image 406-middle, chart image 408-middle-near, and chart image 410-near) each correspond to the distances in Table 1. Chart image 400-1 illustrates that depth of focus is continuous over the illustrated range of distances.

[0028] Reference is now made to Figure 4B, which shows a through-focus character chart image 400-2 for a lens design corresponding to through-focus energy line diagram 300-2. The five chart images in Figure 4B (chart image 412-far, chart image 414-far-middle, chart image 416-middle, chart image 418-middle-near, and chart image 420-near) each correspond to a defocus distance in Table 1. Chart image 400-2 shows that depth of focus is continuous over the illustrated range of distances.

[0029] Referring now to FIG. 5A, FIG. 5A illustrates a photopic full depth of focus (FDoF) microstructure 500 in cross-sectional form. The photopic FDoF microstructure 500 extends across the photopic aperture 202, but does not extend beyond the photopic aperture 202 to the intermediate adaptation aperture 204. At locations between the photopic aperture 202 and the intermediate adaptation aperture 204, normal refractive correction occurs. For the region outside the photopic aperture (RoPA), the photopic microstructure 500 provides refractive power to provide monofocal-like intermediate adaptation vision. Thus, the photopic FDoF microstructure 500 may limit phase perturbations to the photopic aperture 202 and may be free of phase perturbations beyond the photopic aperture 202.

[0030] Referring now to Figure 5B, Figure 5B shows a through-focus energy diagram 501 versus depth of focus for photopic microstructure 500 (see Figure 5A). In diagram 501, photon energy is plotted against defocus depth to show how photon energy is distributed from far to near distances. In particular, diagram 501 shows a similarity to a prime lens, but can be seen to provide more energy at near distances than a prime lens.

[0031] Referring now to Figure 6A, Figure 6A shows a mid-adapting aperture through-focus character chart image 600-1 for a single focus design of photopic microstructure 500 as shown in through-focus energy line diagram 501. The five chart images in Figure 6A (chart image 602-far, chart image 604-far-mid, chart image 606-mid, chart image 608-mid-near, and chart image 610-near) correspond to the defocus distances in Table 1. Chart image 600-1 shows that the far image 602 has single focus quality while maintaining a moderately continuous depth of focus, especially for close distances.

[0032] Referring now to Figure 6B, Figure 6B shows a through-focus character chart image 600-2 for a conventional monofocal IOL as shown in the through-focus energy line diagram 501. The five chart images in Figure 6B (chart image 612-far, chart image 614-far-mid, chart image 616-mid, chart image 618-mid-near, and chart image 620-near) correspond to the defocus distances in Table 1. Chart image 600-2 shows that while far image 612 has monofocal quality, it does not maintain depth of focus, in stark contrast to chart image 600-1.

[0033] Now, referring to FIG. 7A, FIG. 7A shows an FDoF bifocal diffractive microstructure 700 in a cross-sectional shape. The FDoF bifocal diffractive microstructure 700 extends across the photopic aperture 202 to exhibit FDoF characteristics, and extends beyond the photopic aperture 202 to the intermediate adaptation aperture 204 to exhibit bifocal characteristics. The FDoF bifocal diffractive microstructure 700 may provide FDoF photopic vision as illustrated in FIG. 4A or FIG. 4B, and intermediate adaptation vision as bifocal. The phase perturbation beyond the photopic aperture 202 takes the form of a bifocal design. The step height, step width, and phase value of the bifocal design may be optimized for a desired through-focus energy distribution by design methods and procedures described in detail below.

[0034] Referring now to FIG. 7B, FIG. 7B shows a through-focus energy diagram 701 versus depth of focus for the FDoF bifocal diffractive microstructure 700 (see FIG. 7A). In diagram 701, photon energy is plotted against defocus depth to show how the photon energy is distributed over far and near distances. In particular, it can be seen that diagram 701 shows the corresponding intermediate accommodation performance of the particular phase perturbation shown in FIG. 7A. In diagram 701, two foci (one for far vision and one for near vision) can be distinguished by the depth of focus, and the correlation with bifocal lenses is clear.

[0035] Now, referring to FIG. 8A, FIG. 8A shows a mid-adaptation aperture through-focus character chart image 800-1 for an FDoF bifocal diffractive microstructure 700 as shown in a through-focus energy line diagram 701. The five chart images in FIG. 8A (chart image 802-far, chart image 804-far-mid, chart image 806-mid, chart image 808-mid-near, and chart image 810-near) correspond to the defocus distances in Table 1, respectively. The chart image 800-1 shows the mid-adaptation imaging effect in that both the far image 802 and the near image 810 have high quality, while still creating different qualities for the mid images at different levels of focus depth.

[0036] Referring now to Figure 8B, Figure 8B shows a through-focus character chart image 800-2 for a conventional bifocal IOL as shown in through-focus energy line diagram 701. The five chart images in Figure 8B (chart image 812-far, chart image 814-far-mid, chart image 816-mid, chart image 818-mid-near, and chart image 820-near) correspond to the defocus distances in Table 1. Chart image 800-2 shows that both the far image 812 and the near image 820 have high quality, while the mid images at various levels of focal depth have poorer quality than chart image 800-1.

[0037] 9A, which shows an FDoF trifocal diffractive microstructure 900 in cross-sectional form. The FDoF trifocal diffractive microstructure 900 extends across the photopic aperture 202 to provide FDoF characteristics, and extends beyond the photopic aperture 202 to the intermediate adapting aperture 204 to provide trifocal characteristics. The FDoF trifocal diffractive microstructure 900 may provide FDoF photopic vision as illustrated in FIG. 4A or FIG. 4B, and intermediate adapting vision as trifocal. The phase perturbation beyond the photopic aperture 202 takes the form of a trifocal design. The step height, step width, and phase values ​​of the trifocal design may be optimized for a desired through-focus energy distribution by design methods and procedures described in detail below.

[0038] Referring now to FIG. 9B, FIG. 9B shows a through-focus energy diagram 901 versus depth of focus for an FDoF trifocal diffractive microstructure 900 (see FIG. 9A). In diagram 901, photon energy is plotted against defocus depth to show how the photon energy is distributed from far to near distances. In particular, it can be seen that diagram 901 shows the corresponding intermediate accommodation performance of the particular phase perturbation shown in FIG. 9A. In diagram 901, three foci (a focus for far vision, a focus for intermediate vision, and a focus for near vision) can be distinguished by the depth of focus, and the correlation with trifocal lenses is clear.

[0039] Now, referring to FIG. 10A, FIG. 10A shows a mid-adaptation aperture through-focus character chart image 1000-1 for an FDoF trifocal diffractive microstructure 900 as shown in a through-focus energy line diagram 901. The five chart images in FIG. 10A (chart image 1002-far, chart image 1004-far-middle, chart image 1006-middle, chart image 1008-middle-near, and chart image 1010-near) correspond to the defocus distances in Table 1, respectively. The chart image 1000-1 shows a mid-adaptation imaging effect in which the far image 1002, the middle image 1006, and the near image 1010 have good or high quality, while the other middle images at various levels of focal depth further form a continuous image quality.

[0040] Referring now to Figure 10B, Figure 10B shows a through-focus character chart image 1000-2 for a conventional trifocal IOL as shown in the through-focus energy line diagram 901. The five chart images in Figure 10B (chart image 1012-far, chart image 1014-far-mid, chart image 1016-mid, chart image 1018-mid-near, and chart image 1020-near) correspond to the defocus distances in Table 1. Chart image 1000-2 shows an intermediate accommodation imaging effect, with far image 1012, mid-distance image 1016, and near image 1020 having good or high quality.

[0041] The photopic FDoF microstructure 500 shown in FIG. 5A, the FDoF bifocal diffractive microstructure 700 shown in FIG. 7A, and the FDoF trifocal diffractive microstructure 900 shown in FIG. 9A may all be designed according to the following methods and procedures. Photopic microstructures, such as the FDoF photopic microstructure 500, may be defined by a step pattern. The step pattern may be characterized by a number of parameters including, for example, a number of steps, step heights, step widths, and phase values. Photopic microstructures may be designed with a variety of numbers of steps. For example, the FDoF photopic microstructure 500 is shown in FIG. 5A with six steps. However, photopic microstructures may be designed with more or less than six steps. Additionally, other step parameters may be selected to alter the through-focus photopic aperture performance of the ophthalmic lens.

[0042] Once the photopic microstructure is selected, the photopic microstructure may be optimized. For example, any suitable optical design software program (e.g., ZEMAX optical design software) may be used to simulate the performance of the photopic microstructure. During this optimization process, a through-focus photopic aperture performance corresponding to the photopic microstructure may be calculated. Additionally, a reference through-focus photopic aperture performance may be determined and may represent a desired or target performance that is being sought through the design and optimization process. For example, the reference through-focus photopic aperture performance may be a far-distance dominant performance or a near-distance dominant performance. The through-focus photopic aperture performance of the photopic microstructure may be compared to the reference through-focus photopic aperture performance. If the first through-focus aperture performance does not sufficiently approximate the reference through-focus photopic aperture performance, the step parameters of the photopic microstructure may be adjusted.

[0043] Once the step parameters are adjusted, a second through-focus photopic aperture performance corresponding to the adjusted photopic microstructure may be calculated. This second through-focus photopic aperture performance may then be compared to the reference through-focus photopic aperture performance. If the second through-focus photopic aperture performance is sufficiently close to the reference through-focus photopic aperture performance, the adjusted photopic microstructure may be selected and implemented during the manufacture and formation of the ophthalmic lens. However, if the second through-focus photopic aperture performance is not sufficiently close to the reference through-focus photopic aperture performance, the step parameters of the adjusted photopic microstructure may be adjusted again. In some cases, the first through-focus photopic aperture performance may more closely approximate the reference through-focus photopic aperture performance than the second through-focus photopic aperture performance. In this case, the step parameters of the adjusted photopic microstructure may be adjusted accordingly. This process may be repeated as many times as necessary to provide a photopic microstructure having a through-focus photopic aperture performance sufficiently close to the reference through-focus photopic aperture performance. Finally, during the manufacture and formation of an ophthalmic lens, a photopic microstructure may be selected and implemented that has a through-focus photopic aperture performance that most closely approximates the reference through-focus photopic aperture performance.

[0044] Intermediate accommodation microstructures, such as the FDoF bifocal diffractive microstructure 700 at intermediate accommodation aperture shown in FIG. 7A and the FDoF trifocal diffractive microstructure 900 at intermediate accommodation aperture shown in FIG. 9A, may be defined by a step pattern. The step pattern may be characterized by many parameters including, for example, many steps, step heights, step widths, and phase values. Intermediate accommodation microstructures may be designed to provide various types of through-focus intermediate accommodation aperture performance. For example, the FDoF bifocal diffractive microstructure 700 may be designed to approximate a bifocal through-focus intermediate accommodation aperture performance, and the FDoF trifocal diffractive microstructure 900 is designed to approximate a trifocal through-focus intermediate accommodation aperture performance. However, intermediate accommodation microstructures may be designed to approximate other through-focus intermediate accommodation aperture performances by selecting various step parameters.

[0045] Once the intermediate adapting microstructure is selected, the intermediate adapting microstructure may be optimized. For example, any suitable optical design software program (e.g., ZEMAX optical design software) may be used to simulate the intermediate adapting microstructure. During this optimization process, a through-focus intermediate adapting aperture performance corresponding to the intermediate adapting microstructure may be calculated. Furthermore, a reference through-focus intermediate adapting aperture performance may be determined and may represent the objective or target performance being sought through the design and optimization process. For example, the reference through-focus intermediate adapting aperture performance may be a bifocal or trifocal performance as described above. The through-focus intermediate adapting aperture performance of the intermediate adapting microstructure may be compared to the reference through-focus intermediate adapting aperture performance. If the first through-focus intermediate adapting aperture performance does not sufficiently approximate the reference through-focus intermediate adapting aperture performance, the step parameters of the intermediate adapting microstructure may be adjusted.

[0046] Once the step parameters are adjusted, a second through-focus intermediate accommodation aperture performance corresponding to the adjusted intermediate accommodation microstructure may be calculated. This second through-focus intermediate accommodation aperture performance may then be compared to the reference through-focus intermediate accommodation aperture performance. If the second through-focus intermediate accommodation aperture performance is sufficiently close to the reference through-focus intermediate accommodation aperture performance, the adjusted intermediate accommodation microstructure may be selected and implemented during the manufacture and formation of the ophthalmic lens. However, if the second through-focus intermediate accommodation aperture performance is not sufficiently close to the reference through-focus intermediate accommodation aperture performance, the step parameters of the adjusted intermediate accommodation microstructure may be adjusted again. In some cases, the first through-focus intermediate accommodation aperture performance may more closely approximate the reference through-focus intermediate accommodation aperture performance than the second through-focus intermediate accommodation aperture performance. In this case, the step parameters of the adjusted intermediate accommodation microstructure may be adjusted accordingly. This process may be repeated as many times as necessary to provide an intermediate accommodation microstructure having a through-focus intermediate accommodation aperture performance sufficiently close to the reference through-focus intermediate accommodation aperture performance. Finally, in the manufacture and formation of an ophthalmic lens, an intermediate accommodation microstructure may be selected and implemented that has a through-focus intermediate accommodation aperture performance that most closely approximates the reference through-focus intermediate accommodation aperture performance.

[0047] Once both the photopic microstructures and the intermediate adapting microstructures are selected, an ophthalmic lens may be formed and manufactured with the selected adapting microstructures at the photopic aperture of the ophthalmic lens and the selected intermediate adapting microstructures at the intermediate adapting aperture of the ophthalmic lens. The ophthalmic lens may provide presbyopia-correcting full depth of focus vision.

[0048] As disclosed herein, full depth of focus IOLs include diffractive structures formed on the surface of the IOL optic that extend the depth of focus to improve photopic and intermediate adapting vision.

[0049] The subject matter of the above disclosure should be considered as illustrative and not limiting, and the appended claims are intended to include all such modifications, improvements, and other embodiments that fall within the true spirit and scope of the present disclosure. Accordingly, to the maximum extent permitted by law, the scope of the present disclosure should be determined by the broadest permissible interpretation of the following claims and equivalents thereto, and should not be restricted or limited by the above detailed description.

Claims

1. An intraocular lens, wherein the intraocular lens is An optical section including a front surface and a rear surface, wherein a diffraction microstructure is formed on at least one of the front surface and the rear surface, The aforementioned diffraction fine structure is distributed across multiple concentric surface regions. The aforementioned surface region is A first surface region having a first diffractive microstructure defined by a first step pattern including multiple steps, A second surface region is located radially outward from the first surface region, the second surface region having a second diffraction microstructure defined by a second step pattern comprising a plurality of diffraction steps repeated throughout the entire second surface region, the first step pattern comprising a second surface region distinct from the second step pattern, Intraocular lens.

2. The intraocular lens according to claim 1, wherein the first surface region and the second surface region are concentric with respect to the optical axis of the intraocular lens.

3. The intraocular lens according to claim 1, wherein the diffractive microstructure is formed only on either the front surface or the rear surface.

4. The intraocular lens according to claim 1, wherein the diffraction microstructure is formed within the material constituting the optical part.

5. The intraocular lens according to claim 1, wherein the first step pattern and the second step pattern are defined by a step height, a step width, and a phase value parameter, respectively.

6. The intraocular lens according to claim 5, wherein the first step pattern has a different set of step height, step width, and phase value parameters than the second step pattern.

7. The intraocular lens according to claim 1, wherein the first step pattern includes a plurality of steps having different step heights.

8. The intraocular lens according to claim 1, wherein the second step pattern includes a periodic diffraction structure.

9. The intraocular lens according to claim 1, wherein the second diffractive microstructure includes a plurality of echellet.

10. The intraocular lens according to claim 1, wherein the second diffractive microstructure is configured to provide bifocal penetrating focal performance.

11. The intraocular lens according to claim 1, wherein the second diffractive microstructure is configured to provide trifocal penetrating focal performance.

12. The intraocular lens according to claim 1, wherein the first surface region corresponds to the central part of the optical part, and the second surface region corresponds to the peripheral part of the optical part.

Images