Multi-piece intraocular lens with locking mechanism

Abstract

A multi-piece intraocular lens (IOL) is provided having interchangeable optics that are mounted on a base and secured by a locking mechanism. The optic includes an anterior surface having a diameter greater than the diameter of the ring of the base. The posterior side of the optic includes a posterior surface, a transition region for contacting the base, and sidewalls and protrusions radially outward of the transition region. The sidewalls and protrusions overlap at least a portion of the ring to reduce or even prevent decentering and tilting of the optic. Each protrusion has a lateral extension for coupling to the base.

Description

[0001] Priority Declaration

[0002] This application claims the benefit of priority to U.S. Provisional Patent Application Serial No. 62 / 985,419, filed on March 5, 2020, entitled “MULTI-PART INTRAOCULAR LENS WITH LOCKING MECHANISM,” inventors Kamal K. Das and William Jacob Spenner Dolla, which is hereby incorporated by reference in its entirety as if fully and completely set forth herein. Technical Field

[0003] The present disclosure relates generally to multi-piece intraocular lenses (IOLs). More specifically, the present disclosure relates to embodiments of interchangeable optics having a locking mechanism for coupling to a base. Background Art

[0004] The function of the human eye is to provide vision by allowing light to pass through a transparent outer part called the cornea and focusing an image onto the retina through 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.

[0005] The lens is a transparent, biconvex structure in the eye that, along with the cornea, helps refract light so that it is focused on the retina. The lens changes its shape, allowing the eye to focus on objects at various distances, thereby forming a clear, true image of the object of interest on the retina. This adjustment of the lens is called accommodation and is similar to how a camera focuses by moving its lens.

[0006] Aging or other eye diseases cause the lens to become less transparent (e.g., cloudy), and vision can deteriorate due to the reduced light that can be transmitted to the retina. This defect in the lens of the eye is medically known as a cataract. The current effective treatment for this condition is to surgically remove the lens from the capsular bag and place an artificial intraocular lens (IOL) in the capsular bag. Most cataractous lenses are removed through a surgical technique called phacoemulsification. In this procedure, an opening (capsulorhexis) is made on the front side of the capsular bag, and a thin phacoemulsification tip is inserted into the diseased lens and ultrasonically vibrated. The vibrating tip liquefies or emulsifies the lens, making it possible for the lens to be sucked out of the capsular bag. Once the cataractous lens is removed, it is replaced with an IOL. Summary of the Invention

[0007] Embodiments of the IOL described herein include multi-piece IOLs in which a base and optic components are combined. The base generally has a ring and a pair of haptics for positioning and stabilizing the ring in the capsular bag. The optic is selected based on the eye condition to be treated and then coupled to the base to complete the IOL.

[0008] In one embodiment, the base includes a ring and a pair of tabs, and the optic is configured to rest on the front surface of the ring. Sidewalls on the optic overlap the base to reduce or even prevent decentering and tilting of the optic, and protrusions on the optic engage the tabs to secure the optic to the base.

[0009] The ring is formed with a front surface and a rear surface defining the ring thickness and an inner surface and an outer surface defining the ring width.In certain embodiments, the ring may have a groove.

[0010] The optic has an anterior surface formed on the diameter of the optic. The anterior surface has a radius of curvature based on the desired visual outcome for the patient's eye. The optic also has a posterior side with a posterior surface, wherein the posterior surface has a smaller diameter than the anterior surface. The posterior side also includes a transition region for contacting the anterior surface of the ring. The sidewall on the posterior side of the optic is located radially outward from the transition region and is configured to overlap at least a portion of the base when the optic is seated on the base. The height of the sidewall determines the overlap and is selected to reduce or even prevent tilt and decentration once the IOL is implanted in the patient. A protrusion with a lateral extension is also located on the posterior side of the optic. The protrusion has lateral extensions that can be positioned behind features on the base to lock the optic to the base. In some embodiments, these features are haptics. In other embodiments, the features are part of the base, making them readily engageable by the protrusion. In still other embodiments, the base is formed with features. These features can be posts or other physical extensions from the base, or they can be recesses or openings formed in the base.

[0011] Embodiments of the IOLs described herein may provide a larger optic positioned more anteriorly in the capsular bag that may be less sensitive to decentration, reduce the incidence of negative photopsia after implantation, reduce the occurrence of scintillations, and provide other benefits. An IOL having an optic with a sidewall height greater than the annulus thickness may reduce cell proliferation known as posterior capsule opacification (PCO).

[0012] Various other aspects and advantages of embodiments of the present disclosure are described in the following detailed description and accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The accompanying drawings illustrate exemplary embodiments of the present disclosure. The drawings are not necessarily drawn to scale, may include similar elements with the same number, and may include dimensions (in millimeters) and angles (in degrees) that are provided as examples and not necessarily limiting. In the drawings:

[0014] Figure 1 is a perspective view of a multi-piece IOL according to the present disclosure;

[0015] Figure 2 is available for Figure 1 A perspective view of the base portion of the multi-piece IOL shown;

[0016] Figure 3 is available for Figure 1 A perspective view of the base portion of the multi-piece IOL shown;

[0017] Figure 4A and Figure 4B They are Figure 1 Front and side views of the optic of the illustrated multi-piece IOL;

[0018] Figure 5A and Figure 5B They are Figure 1 A perspective view and close-up perspective view of the multi-piece IOL shown;

[0019] Figures 6 to 8 is a top view of the base of a multi-piece IOL showing alternative positions of the locking mechanism;

[0020] Figure 9 is a close-up partial view of an IOL with an alternative locking mechanism; and

[0021] Figure 10 With additional optical devices, Figure 1 A perspective view of a multi-piece IOL is shown. DETAILED DESCRIPTION

[0022] Reference will now be made in detail to examples of the present disclosure, which are illustrated in the accompanying drawings. Wherever possible, the same reference numerals will be used throughout the drawings to refer to the same or like parts. In the following discussion, relative terms such as "about," "substantially," "approximately," and the like are used to indicate a possible variation of ±10% of the stated value, number, or other value, unless otherwise indicated.

[0023] The following detailed description describes a number of different embodiments of multi-piece IOLs and multi-piece IOL systems. Features described with reference to any one embodiment may be applicable to and incorporated into other embodiments.

[0024] I. Multi-Piece IOLs with Interchangeable Optics and Locking Mechanisms—Overview

[0025] Figure 1 Depicted is a multi-piece intraocular lens (IOL) 10 designed for easy insertion and assembly in the capsular bag to correct eye conditions. The IOL 10 includes an interchangeable optic 12 positioned on top of (in front of) a base 14. Figure 1 Further depicted are one of a pair of side walls 16 on the optical device 12 and one of a pair of protrusions 18 positioned relative to a pair of tabs 20 that form part of a locking mechanism discussed in greater detail below.

[0026] During surgery, the surgeon can insert and position the base 14 into the capsular bag, insert the optical device 12 into the capsular bag, and then align and couple the optical device 12 with the base 14 so that the optical device 12 is seated on the base 14. The sidewalls 16 and protrusions 18 formed on the optical device 12 overlap at least a portion of the base 14 to help position the optical device 12 on the base 14 or orient the optical device 12 relative to the base 14 during surgery. When the optical device 12 is positioned on the base 14, the sidewalls 16 and protrusions 18 reduce or even prevent tilt and decentration of the optical device 12.

[0027] II. Base for Supporting the Optic in a Multi-Piece IOL

[0028] Figure 2 and Figure 3 Depicted is a perspective view of an embodiment of a base 14 for use in a multi-piece IOL 10. In general, various designs and configurations of base 14 include a ring 22 in which haptics 20 are formed.

[0029] like Figure 2 and Figure 3 As depicted, the ring 22 is formed with a front surface 24, a rear surface 26, an inner surface 28, and an outer surface 30. The distance between the front surface 24 and the rear surface 26 defines the ring thickness. The outer surface 30 defines the ring circumference. The inner surface 28 and the outer surface 30 define the ring width. Figure 2 , one or more of the front surface 24 , the rear surface 26 , the inner surface 28 , and the outer surface 30 may be formed as a smooth, continuous surface. Figure 3 One type of base 14 is depicted in which one or more of the anterior surface 24, posterior surface 26, inner surface 28, and outer surface 30 are formed with openings 32 that allow a surgeon to more easily insert and manipulate the base 14 or assemble the IOL 10. The inner surface 28 may be formed with a radially inward recess or groove 34 that is commonly used to retain other types of optics.

[0030] Still refer to Figure 2 and Figure 3 The base 14 includes a loop 20 coupled to a loop 22. The loops 20 are shaped to position and stabilize the base 14 within the pocket. Each of the loops 20 has a gusset region 20a, an elbow region 20b, and a distal region 20c. The gusset region 20a can be configured to move the attachment location of the loop 20 radially outward from the loop 22 and can have an opening 36 to allow the surgeon to insert and manipulate the base 14. A pair of openings 36 in the loop 20 can define an axis (BB) of the base 14, discussed in more detail below. The distal region 20c can be configured to provide a contact area between the loop 20 and the pocket. The elbow region 20b can be configured to provide flexibility to the loop 20, allowing the distal region 20c to engage the pocket to position and stabilize the loop 22 within the pocket. The inner surface of the gusset region 20a and the outer surface 30 of the loop 22 form a loop-loop joint 38. In some embodiments, haptics 20 and ring-haptic junction 38 are configured to form part of a locking mechanism for IOL 10, discussed in greater detail below.

[0031] III. Optics mounted on the ring at the base

[0032] Typically, if the optical device (not shown) is positioned in a ring (such as Figure 3 If the optical device is positioned within the depicted ring 22), then the diameter of the optical device will be smaller than the inner diameter of the ring. As a result, this type of optical device will be more difficult to position within the ring, the optical device area will be smaller, and the ring may increase glare or other effects.

[0033] Figure 4A and Figure 4B Depicted are front and side views, respectively, of an optic 12 configured with a large optic area that can be positioned on (rather than within) the ring 22. Figure 4A The optic 12 includes a front surface 40 in which the optic portion may be defined by an optic diameter (D 光学器件 ). Because the optical device 12 is positioned on or above the ring 22, the optical device can be positioned more forward and have a larger front surface 40. These features of the optical device 12 can provide benefits such as mitigating undesirable light phenomena and reducing the occurrence of glare. In some embodiments, the front surface includes an opening 50 discussed below. The optical device 12 has a rear side having a rear surface 42 that defines a region less than D 光学器件 The diameter of the optical device back surface (D POS ) is the radius of curvature of the optical device. POS) can be equal to or greater than the diameter of the inner surface 28 of the ring 22. The rear side of the optical device 12 further includes a transition region 44 between the rear surface 42 and the sidewall 16. In some embodiments, the intersection of the rear surface 42 and the transition region 44 forms an angle. In some embodiments, the D of the rear surface 42 is POS The transition region 44 is approximately the same diameter as the inner surface 28 of the ring 22 , such that the width of the transition region 44 is equal to the width of the ring 22 .

[0034] The optical device 12 further includes components for an embodiment of a locking mechanism. Figure 4A and Figure 4B As depicted, the rear side of the optical device 12 includes sidewalls 16 and protrusions 18 formed near the outer circumference of the optical device 12. Each sidewall 16 is constructed with a height (H 侧壁 ), and each protrusion 18 is constructed with a height (H 突出部 ), so that the side wall 16 and the protrusion 18 extend in the rearward direction to meet the base (such as Figure 2 or Figure 3 The sidewalls 16 and the protrusions 18 may each be formed with a height (H 侧壁 ) and (H 突出部 ) to help position the optical device 12 on the base 14 during surgery and reduce or even prevent decentration and tilting after surgery. Figure 4B As depicted, the height of the side wall 16 (H 侧壁 ) may vary circumferentially, and each sidewall 16 may be tapered or curved to improve usability. In some embodiments, the sidewalls 16 are formed with a height (H) that is less than the thickness of the ring 22. 侧壁 ) such that the sidewall 16 overlaps a portion of the ring 22 but does not completely cover the ring. In other embodiments, the sidewall 16 is formed with a height (H) equal to or greater than the thickness of the ring 22. 侧壁 ) so that the side walls 16 overlap and extend a certain distance behind the ring 22.

[0035] IV. Locking Mechanism for Multi-Piece IOLs

[0036] IOL 10 includes a locking mechanism to help maintain optic 12 seated on base 14 in a desired orientation. Figure 2 、 Figure 3 、 Figure 4A and Figure 4B Portions of one embodiment of a locking mechanism are depicted. Figure 2 and Figure 3 , the ring 22 includes the loop 20, and Figure 4A and Figure 4BThe projections 18 are depicted, wherein each projection 18 includes a lateral extension 46. When the optical device 12 is seated on the ring 22, positioning the lateral extensions 46 behind the loops 20 can lock the optical device 12 to the base 14. In some embodiments, when the optical device 12 is seated on the front surface 24 of the ring 22, the height H of the projection 18 is 突出部 Ensure that lateral extensions 46 are positioned generally behind haptics 20. When lateral extensions 46 are positioned generally behind haptics 20, rotation of optic 12 in a first direction (e.g., clockwise) relative to optical axis (OA) positions lateral extensions 46 behind and proximate to haptics 20, coupling optic 12 with ring 22. In some embodiments, optic 12 can be rotated in the first direction until front surface 48 of lateral extension 46 contacts rear surface of haptics 20 to lock optic 12 to base 14.

[0037] The locking mechanism allows the optical device 12 to be unlocked from the base 14. To unlock the optical device 12 from the base 14, if the optical device 12 and the ring 22 are connected and the optical device 12 is rotated in the opposite direction (e.g., counterclockwise relative to the optical axis OA), the lateral extension 46 can be moved from a position proximate to the haptic 20 to a position not proximate to the haptic 20, so that the optical device 12 and the ring 22 are disconnected and the optical device 12 can be separated from the ring 22.

[0038] V. Assembly of Multi-Piece IOLs with Interchangeable Optics and Locking Mechanisms

[0039] The multi-piece IOL 10, including the base 14 and the optic 12, can be implanted using a variety of different surgical techniques. The multi-piece IOL 10 can be implanted by first delivering the base 14 into the capsular bag in a rolled configuration using an injector (also called an inserter or delivery tube), which is inserted through a corneal incision, through the capsulorrhexis, and into the capsular bag.

[0040] The base 14 can be ejected from the injector and allowed to expand. With gentle manipulation, the haptics 20 of the base 14 engage the inner equator of the lens capsule and center the ring 22 relative to the capsulorrhexis. The openings 36 in the haptics 20 can facilitate handling of the base 14 and indicate the orientation of the base 14, including the axis (BB) associated with the orientation of the base 14.

[0041] The optic 12 can also be delivered in a rolled configuration using an injector, positioning its distal tip adjacent to the base 14. The optic 12 can be ejected from the injector and allowed to unfold. With gentle manipulation, the optic 12 is centered relative to the capsulorrhexis. The optic 12 can have an opening 50 to facilitate insertion into the capsular bag, removal of the optic 12 from the capsular bag, and to assist in aligning the optic 12 relative to the base 14. Figure 5AIn some embodiments, the optic 12 may have two openings 50 on one side of the optic 12 and one opening 50 on the opposite side to indicate the orientation of the optic 12. The openings 50 may help identify the axis (OO) associated with the orientation of the optic 12. In some embodiments, the openings 50 may also serve as toricity markings or indicators to further aid in the alignment of the optic 12, and more generally, the IOL 10.

[0042] Once the optic 12 has been delivered into the capsular bag and deployed therein, the optic 12 may be connected to the base 14 .

[0043] The optical device 12 may be connected to the base 14 by first placing the optical device 12 on the base 14. The optical device 12 may be positioned on the base 14 such that the sidewall 16 overlaps at least a portion of the ring 22. A small force may be applied until the transition region 44 contacts the front surface 24 of the ring 22. Figure 5A and Figure 5B A perspective view and a close-up partial perspective view of IOL 10 with optic 12 seated on base 14 are depicted, respectively.

[0044] Still refer to Figure 5A and Figure 5B Once optic 12 is seated on base 14, optic 12 can be manipulated to generally position protrusion 18 within ring-hook junction 38. With protrusion 18 positioned within ring-hook junction 38, rotation of optic 12 relative to optical axis (OA) can position lateral extension 46 beneath haptic 20. In some embodiments, positioning lateral extension 46 beneath haptic 20 results in contact between anterior surface 48 of lateral extension 46 and posterior surface of haptic 20. With protrusion 18 generally positioned within ring-hook junction 38, Figure 5A and Figure 5B In the depicted embodiment, clockwise rotation of the optic 12 relative to the optical axis (OA) positions the lateral extension 46 behind the haptic 20 such that the anterior surface 48 contacts the posterior surface of the haptic 20 .

[0045] refer to Figure 3 and Figure 5A , base 14 can have a first axis (BB), and optic 12 can have a second axis (OO). Base 14 can be inserted into the capsular bag and manipulated to orient the first axis (BB). Opening 36 on base 14 can facilitate insertion and manipulation of base 14, which can include orienting the first axis (BB). Additionally, opening 50 on optic 12 can facilitate insertion and manipulation of optic 12, including aligning the second axis (OO) relative to the first axis (BB) to align optic 12 relative to base 14.

[0046] If desired, the IOL 10, including the optic 12 and base 14, can be removed by generally reversing the above steps. Removal of the IOL 10 is initiated by rotating the optic 12 relative to the base 14 to disengage the projections 18 from the haptics 20. Figure 5A and Figure 5B In the depicted embodiment, counterclockwise rotation of the optical device 12 will disengage the lateral extensions 46 from the haptics 20 such that the lateral extensions 46 are behind the haptics 20 but not proximate to them.

[0047] A probe or similar device can enter the capsular bag containing the multi-piece IOL 10. The probe or similar device can engage the opening 50 in the optic 12 and rotate the optic 12. As the optic 12 rotates, the lateral extensions 46 disengage from the haptics 20. With gentle manipulation, the optic 12 can be lifted, disconnecting the optic 12 from the base 14. The probe can remove one or more of the optic 12 and the base 14.

[0048] VI. Alternative Locking Mechanisms

[0049] The protrusion 18 having the lateral extension 46 that engages the haptic 20 provides an interlocking connection between the base 14 and the optical device 12. More generally, one or more interlocking connections can be provided between the base 14 and the optical device 12. Each interlocking connection can include a pair of interlocking members, wherein one or both of the interlocking members are actuatable. Figures 6 to 8 An embodiment of a base 14 formed with features that may be used in a locking mechanism of an IOL 10 is depicted.

[0050] refer to Figure 6 , a pair of struts 52 may be formed on the outer surface 30 of the ring 22. The optical device 12 ( Figure 6 Not shown) can be constructed as described above with reference Figure 4A and Figure 4B The optical device 12 can be placed on the base 14 and rotated as described above. However, instead of the lateral extension 46 engaging the loop 20, the lateral extension 46 engages the post 52 outside the ring 22. Figure 7 , a pair of struts 52 can be formed on the inner surface 28 of the ring 22. The optic 12 (not shown) can be configured with the protrusion 18 located radially inwardly of the transition region 44. The optic 12 can be placed on the base 14 and rotated as described above. However, instead of the lateral extensions 46 engaging the haptics 20, the lateral extensions 46 engage the struts 52 inside the ring 22.

[0051] refer to Figure 8, a pair of openings 54 can be formed in the ring 22. The protrusions 18 can be formed in the transition region 44 of the optic 12 (not shown). When the optic 12 is seated on the base 14, the protrusions 18 extend through the openings 54 so that rotation of the optic 12 relative to the ring 22 causes the lateral extensions 46 to engage the rear surface 26 of the ring 22.

[0052] Figures 6 to 8 An advantage of the depicted embodiment may be that, even with the presence of the haptic 20, the optic 12 may be coupled to the base 14 without the use of the haptic 20. Additionally, the projection 18 may be positioned within the optic diameter (D 光学器件 ) In radially inner embodiments, the sidewall 16 may span a larger portion of the circumference to provide additional stability and other benefits.

[0053] refer to Figure 9 , IOL 10 can utilize a locking mechanism in which the anterior surface 48 of lateral extension 46 is angled, as indicated by angle 56. Rotation of optic 12 relative to base 14 brings anterior surface 48 of lateral extension 46 into contact with posterior surface 58 of haptic 20. Continued rotation creates a tension in protrusion 18, which can assist in seating optic 12 on base 14.

[0054] Figure 9 Also depicted is a notch 60 formed on the haptic 20. The notch 60 can receive the protrusion 18 and the lateral extension 46 such that when the optic 12 is seated on the base 14 and the lateral extension 46 is positioned in the notch 60, the protrusion 18 is flush with (i.e., does not extend beyond) the rear surface of the haptic 20.

[0055] Figure 9 The lateral extension 46 is further depicted having a recess 62 that may correspond to a raised feature 64 on a corresponding mating feature of the haptic 20. The raised feature 64 positioned in the recess 62 limits or even prevents the optic 12 from becoming disengaged from the base 14.

[0056] VII. Multi-piece IOLs supporting additional optics

[0057] refer to Figure 10 , the embodiments described herein allow other optical components to be added to the IOL 10. Figure 10 As depicted, the IOL 10 includes the optic 12 disposed on the base 14, and further depicted is the second optic 66 disposed on the (first) optic 12. Using the techniques and features described above, the surgeon can insert the base 14, insert and couple the (first) optic 12 to the base 14, and insert and couple the second optic 66 to the (first) optic 12. In addition, Figure 10The depicted base 14 includes a groove 34 so that another optical component (not shown) can be supported by the base 14. The ability to have multiple optical components in a stable structure and the increased optic area increase the usability of the multi-piece IOL 10 for treating eye conditions. In addition, the IOL 10 can be assembled so that the haptics 20 do not require the addition of a secondary optic 66.

[0058] In general, the multi-piece IOL 10, including the base 14 and the optic 12 (including the alternative embodiments described herein), allows the optic 12 to be adjusted or replaced during or after surgery while leaving the base 14 in place. Examples of situations where this may be desirable include, but are not limited to: replacing the optic 12 to correct a less than optimal refractive outcome detected during surgery; replacing the optic 12 to correct a less than optimal refractive outcome detected after surgery (residual refractive error); rotationally adjusting the optic 12 relative to the base 14 to fine-tune toric correction; adjusting the optic 12 laterally relative to the base 14 to align the optic 12 with the true optical axis (which may not be the center of the capsular bag); and replacing the optic 12 to address different optical needs or desires of a patient over a longer period of time. Examples of the latter situation include, but are not limited to: adult or pediatric IOL patients whose initial optical correction needs to change as she / he matures; patients who wish to upgrade from a monofocal IOL to an advanced IOL (toric, multifocal, accommodative, or other future lens technology); patients who are dissatisfied with an advanced IOL and want to downgrade to a monofocal IOL; and patients with medical conditions that contraindicate an IOL or a specific type of IOL.

[0059] By way of example, and not necessarily limitation, IOLs according to embodiments of the present disclosure may be used to treat cataracts, large optical errors in myopia (nearsightedness), hyperopia (farsightedness), and astigmatism, ectopia lentis, aphakia, pseudophakia, and nuclear sclerosis. However, for descriptive purposes, embodiments of the present disclosure will be described with reference to cataracts, which are common in the elderly population.

[0060] The foregoing discussion of the present disclosure has been given for purposes of illustration and description. The foregoing is not intended to limit the present disclosure to the form or forms disclosed herein. Although the present disclosure includes a description of one or more embodiments and certain variations and modifications, other variations and modifications, such as within the skill and knowledge of those skilled in the art, after understanding the present disclosure, are also within the scope of the present disclosure. It is intended to obtain the right to include, to the extent permitted, alternative embodiments including alternative, interchangeable and / or equivalent structures, functions, scopes or steps of those claimed, whether or not such alternative, interchangeable and / or equivalent structures, functions, scopes or steps are disclosed herein, and it is not intended to disclose any patentable subject matter.

Claims

1. An intraocular lens assembly, comprising: A base, the base comprising: A ring comprising: a front surface and a back surface defining a thickness of the ring; an outer surface defining a ring diameter; and a pair of loops extending from the outer surface of the ring, each loop comprising a gusset region, an elbow region, and a distal region, wherein an inner surface of the gusset region and the outer surface of the ring form a loop-loop junction; and An optical device, comprising: a front side having a front surface defining a front surface diameter greater than a diameter of the ring; A rear side, comprising: posterior surface; a transition region radially outward of the rear surface; a pair of sidewalls located radially outward of the transition region, wherein each sidewall has a sidewall height; and a pair of protrusions located radially outward of the transition region, wherein: Each protrusion defines a protrusion height; Each projection includes a lateral extension; and When the protrusion is positioned in the loop-loop junction, the protrusion positions the lateral extension behind a posterior surface of one of the pair of loops.

2. The intraocular lens assembly of claim 1, wherein: The sidewall height is greater than the ring thickness.

3. The intraocular lens assembly of claim 1 , wherein: The pair of loops defines a first axis; and The pair of protrusions are arranged on the second axis; Wherein positioning each protrusion in the loop-loop junction aligns the second axis with the first axis.

4. The intraocular lens assembly of claim 3, wherein: a first pair of openings in the loop defining the first axis; A second pair of openings in the optical device defines the second axis; and Aligning the second pair of openings on the optical device relative to the first pair of openings on the haptic aligns the second axis with the first axis.

5. The intraocular lens assembly of claim 1 , wherein: Each lateral extension includes a front surface; and When the protrusion is positioned in the ring-hook junction, rotation of the optic relative to the base positions the protrusion proximate the haptic to enable contact between an anterior surface of the lateral extension and a posterior surface of the haptic.

6. The intraocular lens assembly of claim 1, wherein: The inner surface of the ring includes a groove.

7. The intraocular lens assembly of claim 6, further comprising a second optic positioned in the recess.

8. The intraocular lens assembly of claim 1 , wherein: Each tab includes a notch for receiving a lateral extension of each tab.

9. The intraocular lens assembly of claim 1, wherein: The front surface of each lateral extension includes a recess for receiving a raised feature.

10. An intraocular lens (IOL) assembly, comprising: A base, the base comprising: A ring comprising: a front surface and a back surface defining a thickness of the ring; an outer surface defining a ring diameter; and a pair of struts extending radially from the ring; An optical device, comprising: a front side having a front surface defining a front surface diameter greater than a diameter of the ring; A rear side, comprising: a rear surface having a rear surface radius of curvature; a transition region radially outward of the rear surface; a pair of sidewalls located radially outward of the transition region, wherein each sidewall has a sidewall height; and a pair of protrusions extending in a rearward direction, wherein: Each protrusion defines a protrusion height; Each projection includes a lateral extension; and The pair of protrusions positions the lateral extension behind the pair of posts when the optical device is seated on the base.

11. The IOL assembly of claim 10, wherein: the pair of struts extending radially outward from the outer surface of the ring; The pair of protrusions are located radially outward of the rear surface of the optical device; When the optical device is seated on the base, the pair of protrusions positions the lateral extension behind the pair of posts; and Rotation of the optic relative to the base brings the anterior surface of each lateral extension into contact with the posterior surface of one of the pair of posts.

12. The IOL assembly of claim 10, wherein: The struts extend radially inward from the inner surface of the ring; The pair of protrusions are located on the rear surface of the optical device; When the optical device is seated on the base, the pair of protrusions positions the lateral extension behind the pair of posts; and Rotation of the optic relative to the base brings the anterior surface of each lateral extension into contact with the posterior surface of one of the pair of posts.

13. The IOL assembly of claim 10, wherein: The pair of struts define a first axis; and The pair of projections define a second axis; Wherein coupling the pair of protrusions with the pair of struts aligns the second axis with the first axis.

14. The IOL assembly of claim 10, wherein: The width of the transition region and the width of the ring are substantially equal.

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