Multi-component intraocular lens having a locking mechanism

Abstract

A multi-component intraocular lens (IOL) having an interchangeable optic seated on a base and secured by a locking mechanism. The optic has an anterior surface with a diameter larger than the diameter of the base ring. The posterior side of the optic has a posterior surface, a transition region for contacting the base, and sidewalls and tabs radially outward of the transition region. The sidewalls and tabs overlap at least a portion of the ring to reduce or even prevent decentering and tilting of the optic. Each tab has a lateral extension for coupling to the base.

Description

[Technical field]

[0001] Priority This application claims the benefit of priority to U.S. Provisional Application No. 62 / 985,419, filed March 5, 2020, entitled "MULTI-PART INTRAOCULAR LENS WITH LOCKING MECHANISM," inventors Kamal K. Das and William Jacob Spenner Dolla, all of which are incorporated by reference as if fully and completely set forth herein.

[0002] The present disclosure relates generally to multi-component intraocular lenses (IOLs). In particular, the present disclosure relates to embodiments of an interchangeable optic having a locking mechanism for coupling to a base. [Background technology]

[0003] The human eye functions to provide vision by transmitting light through a clear outer portion called the cornea and focusing the 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.

[0004] The crystalline lens is a transparent biconvex structure within the eye that, together with the cornea, serves to refract light and focus it on the retina. By changing its shape, the crystalline lens functions to change the focal length of the eye so that objects at different distances can be focused on, thus allowing a sharp, real image of the object to be formed on the retina. This adjustment of the crystalline lens is known as accommodation, and is analogous to the focusing of a photographic camera by the movement of its lens.

[0005] Aging or other eye diseases reduce the transparency of the lens (e.g., cause clouding), decreasing the amount of light that can be transmitted to the retina and thus reducing vision. This defect in the eye's lens is medically known as a cataract. The currently available treatment for this condition is to surgically remove the lens from the lens capsule and place an intraocular lens (IOL) within the lens capsule. Most of the cataract lens is removed by a surgical technique called phacoemulsification. During this procedure, an opening (capsulotomy) is formed in the front of the lens capsule, and a thin cutting tip for phacoemulsification is inserted into the affected lens and vibrated by ultrasound. The vibrating cutting tip liquefies or emulsifies the lens so that the lens can be aspirated from the lens capsule. Once the cataract lens is removed, it is replaced with an IOL.

Summary of the Invention

Means for Solving the Problems

[0006] The IOL embodiments described herein include a multi-component IOL in which a base and an optical component are combined. The base generally has a ring and a pair of haptics for positioning and stabilizing the ring within the lens capsule. The optical component is selected based on the symptoms of the eye being treated and is then coupled to the base to complete the IOL.

[0007] In one embodiment, the base includes a ring, a pair of haptics, and an optical component configured to seat on the front surface of the ring. Sidewalls on the optical component overlap the base to reduce or even prevent eccentricity and tilt of the optical component, and tabs on the optical component engage the haptics to secure the optical component to the base.

[0008] The ring is formed with a front surface and a rear surface that define a ring thickness, and an inner surface and an outer surface that define a ring width. In certain embodiments, the ring may have a groove.

[0009] The optical component has a front surface that is formed across the diameter of the optical component. The front surface has a radius of curvature based on a desired visual outcome of the patient's eye. The optical component also has a posterior side having a rear surface with a diameter smaller than that of the front surface. The posterior side also includes a transition region for contacting the front surface of the ring. The sidewall of the posterior side of the optical component is located radially outside the transition region and is configured to overlap at least a portion of the base when the optical component is seated on the base. The height of the sidewall is selected to define the overlap and to reduce or even prevent tilt and decentration when the IOL is implanted in a patient. A tab having a laterally extending portion is also located on the posterior side of the optical component. The tab has a laterally extending portion that is positioned behind a feature on the base and can lock the optical component to the base. In some embodiments, these features are haptics. In other embodiments, the feature is part of the base such that the feature is already available for engagement by the tab. In other embodiments, the base is formed with the feature. The feature may be a post or other physical extension from the base or may be a recess or opening formed in the base.

[0010] Embodiments of the IOL described herein may provide an optical component that is larger and positioned more anteriorly within the capsular bag, which is less sensitive to decentration, reduces the incidence of abnormal photopsia after implantation, reduces the prevalence of glare, and may provide other benefits. An IOL comprising an optical component having a sidewall with a sidewall height greater than the ring thickness may reduce cell proliferation referred to as posterior capsular opacification (PCO).

[0011] Various other aspects and advantages of embodiments of the present disclosure are set forth in the following detailed description and the drawings.

[0012] The drawings illustrate exemplary embodiments of the present disclosure. The drawings are not necessarily to scale and may include similar elements labeled with the same numbers and, by way of example and not limitation, may include dimensions (in millimeters) and angles (in degrees).

Brief Description of the Drawings

[0013]

Figure 1

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DETAILED DESCRIPTION OF THE INVENTION

[0014] Here, reference is made in detail to the embodiments of the present disclosure shown in the accompanying drawings. As far as possible, the same reference numbers are used throughout the drawings to refer to the same or similar parts. In the following discussion, relative terms such as "about", "substantially", "approximately", etc. are used to indicate possible variations of ±10% in the values, numerical values, etc. described, unless otherwise indicated by other variations.

[0015] The following detailed description describes various embodiments of a multi-component IOL and a multi-component IOL system. Features described with reference to any one embodiment may be applied to and incorporated into other embodiments.

[0016] I. Multi-component IOL with Replaceable Optical Component and Locking Mechanism - Overview FIG. 1 shows a multi-component intraocular lens (IOL) 10 designed to facilitate insertion and assembly into the capsular bag of the eye to treat eye conditions. The IOL 10 includes a replaceable optical component 12 seated on top (front) of a base 14. FIG. 1 further shows one of a pair of sidewalls 16 on the optical component 12 and one of a pair of tabs 18 positioned with respect to a pair of haptics 20 that form part of a locking mechanism to be discussed in more detail below.

[0017] During surgery, the surgeon can insert and position the base 14 into the capsular bag, insert the optical component 12 into the capsular bag, and then align and couple the optical component 12 to the base 14 such that the optical component 12 seats on the base 14. The sidewalls 16 and tabs 18 formed on the optical component 12 overlap at least a portion of the base 14 to facilitate positioning of the optical component 12 onto the base 14 or placing the optical component 12 in the correct orientation with respect to the base 14 during surgery. When the optical component 12 is positioned on the base 14, the sidewalls 16 and tabs 18 reduce or even prevent tilting and decentration of the optical component 12.

[0018] II. Base for Supporting the Optical Component in a Multi-component IOL Figures 2 and 3 show perspective views of embodiments of the base 14 for use in the multi-component IOL 10. Generally, the various designs and configurations of the base 14 include a ring 22 formed with the haptic 20.

[0019] As shown in FIGS. 2 and 3, 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 thickness of the ring. The outer surface 30 defines the ring circumference. The inner surface 28 and the outer surface 30 define the ring width. Referring to FIG. 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. FIG. 3 shows a type of base 14 in which one or more of the front surface 24, the rear surface 26, the inner surface 28, and the outer surface 30 are formed with an opening 32 that allows 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 hold other types of optical components.

[0020] Referring further to FIGS. 2 and 3, the base 14 includes a haptic 20 coupled to the ring 22. The haptic 20 is shaped to position and stabilize the base 14 within the capsular bag. Each of the haptics 20 has a gusset region 20a, an elbow region 20b, and a distal region 20c. The gusset region 20a may be configured to move the attachment location of the haptic 20 radially outward from the ring 22 and may have an opening 36 that allows a surgeon to insert and manipulate the base 14. A pair of openings 36 within the haptic 20 may define an axis (B-B) of the base 14 that is discussed in more detail below. The distal region 20c may be configured to provide a contact region between the haptic 20 and the capsular bag. The elbow region 20b may be configured to provide flexibility of the haptic 20 to allow the distal region 20c to engage the capsular bag to position and stabilize the ring 22 within the capsular bag. The inner surface of the gusset region 20a and the outer surface 30 of the ring 22 form a ring-haptic junction 38. In some embodiments, the haptic 20 and the ring-haptic junction 38 are configured to form part of a locking mechanism of the IOL 10 that is discussed in more detail below.

[0021] III. Optical Component for Seating on the Ring of the Base Generally, when an optical component (not shown) is positioned inside a ring (such as ring 22 shown in FIG. 3), the optical component has a diameter smaller than the inner diameter of the ring. As a result, this type of optical component is more difficult to position within the ring, the optical portion is smaller, and the ring has the potential to increase glare or other effects.

[0022] FIGS. 4A and 4B show a front view and a side view, respectively, of an optical component 12 configured with a large optical portion that is capable of seating (instead of seating therein) on the ring 22. Referring to FIG. 4A, the optical component 12 has an optical diameter (D of the optical portion of the optical component 12 OPTICIt may include a front surface 40 that may be defined over a range. By positioning the optical component 12 on or covering the ring 22, the optical component may thus not only be positioned further forward but may also have a larger front surface 40. These features of the optical component 12 may provide benefits such as, for example, alleviating undesirable light phenomena and reducing the morbidity rate of glints. In some embodiments, the front surface includes an aperture 50, which will be discussed below. The optical component 12 has a rear side that defines a radius of curvature with respect to an optical rear diameter (D OPTIC smaller than D POS ). The optical rear diameter (D POS ) may be greater than or equal to the diameter of the inner surface 28 of the ring 22. The rear side of the optical component 12 further includes a transition region 44 between the rear surface 42 and the sidewall 16. In certain embodiments, the intersection of the rear surface 42 and the transition region 44 forms an angle. In certain embodiments, the DPOS of the rear surface 42 is substantially the same as the diameter of 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.

[0023] The optical component 12 further includes components used in one embodiment of a locking mechanism. As shown in FIGS. 4A and 4B, the rear side of the optical component 12 includes a sidewall 16 and a tab 18 formed near the outer periphery of the optical component 12. Each sidewall 16 is configured with a height (H SIDEWALL ), and each tab 18 is configured with a height (H TAB ) such that the sidewall 16 and the tab 18 extend rearward and overlap a base (such as the base 14 shown in FIG. 2 or FIG. 3). The sidewall 16 and the tab 18 are each formed with a height (H SIDEWALL ) and (H TAB ) to facilitate positioning of the optical component 12 on the base 14 during surgery and even reduce or prevent eccentricity and tilt after surgery. As shown in FIG. 4B, the height (H SIDEWALL ) of the sidewall 16 may vary circumferentially, and each sidewall 16 may be tapered or curved to improve usability. In some embodiments, the sidewall 16 has a height (H SIDEWALL) is formed together with. In other embodiments, the sidewall 16 overlaps such that the sidewall 16 extends a distance behind the ring 22 and has a height (H greater than or equal to the thickness of the ring 22 SIDEWALL ) is formed together with.

[0024] IV. Locking Mechanism for a Multi-Part IOL The IOL 10 includes a locking mechanism that facilitates keeping the optical component 12 seated on the base 14 in a desired orientation. FIGS. 2, 3, 4A, and 4B illustrate a portion of one embodiment of the locking mechanism. Referring to FIGS. 2 and 3, the ring 22 includes the haptic 20, and FIGS. 4A and 4B illustrate the tabs 18, where each tab 18 includes a laterally extending portion 46. When the optical component 12 is seated on the ring 22, the optical component 12 may be latched to the base 14 by positioning the laterally extending portion 46 behind the haptic 20. In some embodiments, when the optical component 12 is seated on the front surface 24 of the ring 22, the height H of the tab 18 TAB is such that the laterally extending portion 46 is generally positioned behind the haptic 20. When the laterally extending portion 46 is generally positioned behind the haptic 20, rotation of the optical component 12 in a first direction (e.g., clockwise) with respect to the optical axis (OA) positions the laterally extending portion 46 behind and adjacent to the haptic 20 such that the optical component 12 and the ring 22 are connected. In some embodiments, the optical component 12 is rotatable in the first direction until the front surface 48 of the laterally extending portion 46 contacts the rear surface of the haptic 20 to latch the optical component 12 to the base 14.

[0025] The locking mechanism enables the optical component 12 to be unlatched from the base 14. To unlatch the optical component 12 from the base 14, when the optical component 12 and the ring 22 are connected and the optical component 12 is rotated in the opposite direction (e.g., counterclockwise with respect to the optical axis OA), the laterally extending portion 46 may be moved from a position adjacent to the haptic 20 to a position not adjacent to the haptic 20 so as to disengage the optical component 12 and the ring 22 and separate the optical component 12 from the ring 22.

[0026] V. Assembly of a Multi-Part IOL with Interchangeable Optical Components and a Locking Mechanism The multi-part IOL 10, including the base 14 and the optical component 12, may be implanted using various surgical techniques. The multi-part IOL 10 may be implanted by first delivering the base 14 into the lens capsule in a rolled configuration through a corneal incision, through a capsulotomy, using an injector (also known as an inserter or delivery tube) that is inserted into the lens capsule.

[0027] The base 14 may be discharged from the injector and enabled to deploy. With gentle manipulation, the haptic 20 of the base 14 engages the inner equator of the lens capsule and the central ring 22 against the capsulotomy. The opening 36 in the haptic 20 may facilitate handling of the base 14 and indicate the orientation of the base 14 including the axis (B-B) associated with the orientation of the base 14.

[0028] The optical component 12 may also be delivered in a rolled configuration using an injector and positioned adjacent to the base 14 at its distal tip. The optical component 12 may be discharged from the injector and enabled to deploy. With gentle manipulation, the optical component 12 is centered with respect to the capsulotomy. The optical component 12 may have an opening 50 to facilitate insertion of the optical component 12 into the lens capsule, to remove the optical component 12 from the lens capsule, and to assist in aligning the optical component 12 with respect to the base 14. Referring to FIG. 5A, the optical component 12 may have two openings 50 on one side of the optical component 12 and one opening 50 on the opposite side to indicate the orientation of the optical component 12. The opening 50 may facilitate identifying the axis (O-O) associated with the optical component 12. The opening 50 may also function as a toric marker or indicator in some embodiments to further facilitate alignment of the optical component 12 and more generally the IOL 10.

[0029] Once the optical component 12 is delivered and deployed within the lens capsule, the optical component 12 may be connected to the base 14.

[0030] The optical component 12 may be connected to the base 14 by, first, seating the optical component 12 on the base 14. The optical component 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. FIGS. 5A and 5B show, respectively, a perspective view and an enlarged partial perspective view of the IOL 10 with the optical component 12 seated on the base 14.

[0031] Still referring to FIGS. 5A and 5B, when the optical component 12 is seated on the base 14, the optical component 12 may generally be manipulated to position the tab 18 within the ring-haptic junction 38. With the tab 18 positioned within the ring-haptic junction 38, rotation of the optical component 12 about the optical axis (OA) may position the lateral extension 46 beneath the haptic 20. In some embodiments, positioning the lateral extension 46 beneath the haptic 20 results in contact between the front surface 48 of the lateral extension 46 and the rear surface of the haptic 20. In the embodiment shown in FIGS. 5A and 5B where the tab 18 is generally positioned within the ring-haptic junction 38, clockwise rotation of the optical component 12 about the optical axis (OA) positions the lateral extension 46 behind the haptic 20 such that the front surface 48 contacts the rear surface of the haptic 20.

[0032] Referring to FIGS. 3 and 5A, the base 14 may have a first axis (B-B), and the optical component 12 may have a second axis (O-O). The base 14 may be inserted into the capsular bag and manipulated to orient the first axis (B-B). The opening 36 in the base 14 may facilitate the insertion and manipulation of the base 14, which may include orienting the first axis (B-B). Further, the opening 50 in the optical component 12 may facilitate the insertion and manipulation of the optical component 12, which may include aligning the second axis (O-O) with respect to the first axis (B-B) to align the optical component 12 with respect to the base 14.

[0033] Optionally, the IOL 10 including the optical component 12 and the base 14 may be removed by substantially reversing the steps described above. Removal of the IOL 10 begins by rotating the optical component 12 relative to the base 14 to disengage the tab 18 from the haptic 20. In the embodiments shown in FIGS. 5A and 5B, counterclockwise rotation of the optical component 12 disengages the laterally extending portion 46 from the haptic 20 such that the laterally extending portion 46 is behind but not proximate to the haptic 20.

[0034] A probe or similar device may enter the capsular bag containing the multi-component IOL 10. The probe or similar device may engage an opening 50 within the optical component 12 and rotate the optical component 12. As the optical component 12 is rotated, the laterally extending portion 46 disengages from the haptic 20. With gentle manipulation, the optical component 12 may be lifted such that the optical component 12 and the base 14 are separated. The probe may remove one or more of the optical component 12 and the base 14.

[0035] VI. Alternative Locking Mechanism The tab 18 having the laterally extending portion 46 that engages the haptic 20 provides an interlock connection between the base 14 and the optical component 12. More generally, one or more interlock connections may be provided between the base 14 and the optical component 12. Each interlock connection may include a pair of interlock members, where one or both of the interlock members are operable. FIGS. 6-8 show embodiments of the base 14 formed with features that may be used in a locking mechanism for the IOL 10.

[0036] Referring to FIG. 6, a pair of posts 52 may be formed on the outer surface 30 of the ring 22. The optical component 12 (not shown in FIG. 6) may be configured with the tabs 18 as described above with respect to FIGS. 4A and 4B. The optical component 12 may be seated on the base 14 and rotated as described above. However, instead of the laterally extending portion 46 engaging the haptic 20, the laterally extending portion 46 engages the post 52 outside the ring 22. Referring to FIG. 7, a pair of posts 52 may be formed on the inner surface 28 of the ring 22. The optical component 12 (not shown) may be configured with the tabs 18 located radially inward of the transition region 44. The optical component 12 may be seated on the base 14 and rotated as described above. However, instead of the laterally extending portion 46 engaging the haptic 20, the laterally extending portion 46 engages the post 52 inside the ring 22.

[0037] Referring to FIG. 8, a pair of openings 54 may be formed in the ring 22. The tab 18 may be formed in the transition region 44 of the optical component 12 (not shown). When the optical component 12 is seated on the base 14, the tab 18 extends through the opening 54 so as to engage the laterally extending portion 46 with the rear surface 26 of the ring 22 by the rotation of the optical component 12 with respect to the ring 22.

[0038] An advantage of the embodiments shown in FIGS. 6-8 may be that the optical component 12 can be coupled to the base 14 without using the haptic 20 even when the haptic 20 is present. Further, in embodiments where the tab 18 is radially inward of the optical component diameter (D OPTIC ) the sidewall 16 can extend over a greater portion of the circumference to provide additional stability and other advantages.

[0039] Referring to FIG. 9, the IOL 10 may utilize a locking mechanism in which the front surface 48 of the laterally extending portion 46 is inclined as indicated by the angle 56. Rotation of the optical component 12 with respect to the base 14 causes the front surface 48 of the laterally extending portion 46 to contact the rear surface 58 of the haptic 20. Continuing the rotation may create a tensile force on the tab 18, which may help seat the optical component 12 on the base 14.

[0040] Figure 9 also shows a notch 60 formed in the haptic 20. The notch 60 may receive the tab 18 and the laterally extending portion 46 such that when the optical component 12 seats on the base 14 and the laterally extending portion 46 is positioned within the notch 60, the tab 18 is flush with (i.e., does not extend beyond) the rear surface of the haptic 20.

[0041] Figure 9 further shows a laterally extending portion 46 having a recess 62 that may correspond to a raised feature 64 on a corresponding joining feature of the haptic 20. The raised feature 64 positioned within the recess 62 inhibits, and further prevents, the optical component 12 from being separated from the base 14.

[0042] VII. Multi-component IOL Supporting Additional Optical Components Referring to FIG. 10, the embodiments described herein enable adding other optical components to the IOL 10. As shown in FIG. 10, the IOL 10 includes an optical component 12 that seats on the base 14 and further shows a second optical component 66 that seats on the (first) optical component 12. Using the techniques and features described above, a surgeon can insert the base 14, insert and couple the (first) optical component 12 to the base 14, and insert and couple the second optical component 66 to the (first) optical component 12. Further, the base 14 shown in FIG. 10 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 within a stable structure with increased optical parts increases the usefulness of the multi-component IOL 10 for treating eye conditions. Further, the IOL 10 may be assembled such that the haptic 20 is not required to add the second optical component 66.

[0043] Generally, the multi-component IOL 10 comprising a base 14 and an optical component 12, including alternative embodiments described herein, enables adjustment or replacement of the optical component 12 while leaving the base 14 in place, either during or after surgery. Examples of cases where this may be desirable include replacing the optical component 12 to correct a sub-optimal refractive result detected during surgery, replacing the optical component 12 to correct a sub-optimal refractive result (residual refractive error) detected after surgery, adjusting the optical component 12 by rotating it relative to the base 14 to fine-tune toric correction, laterally adjusting the optical component 12 relative to the base 14 for alignment with the true optical axis (which may not be at the center of the lens capsule), and replacing the optical component 12 to address changing optical needs or desires of the patient over time, including, but not limited to, adult or pediatric IOL patients who need to change their original optical correction as they mature, patients who wish to upgrade from a monofocal IOL to a premium IOL (toric, multifocal, accommodating or other future lens technologies), patients who are not satisfied with a premium IOL and wish to downgrade to a monofocal IOL, and patients who have developed a medical condition for which an IOL or a particular type of IOL is contraindicated.

[0044] By way of example, and without necessarily being limiting, an IOL according to embodiments of the present disclosure may be used to treat large optical errors, lens dislocation, aphakia, pseudophakia, and nuclear sclerosis in cataract, myopic (near-sighted) eyes, hyperopic (far-sighted) eyes, and astigmatic eyes. However, for purposes of explanation, the IOL embodiments of the present disclosure are often described with reference to cataracts that occur in the elderly population.

[0045] The foregoing discussion of the present disclosure has been presented for purposes of illustration and description. The foregoing is not intended to limit the present disclosure to the forms disclosed herein in singular or plural. The present disclosure includes descriptions of one or more embodiments and certain variations and modifications thereof, but other variations and modifications may be within the scope of the present disclosure, such as may be within the skill and knowledge of those of ordinary skill in the art after understanding the present disclosure. Whether or not such alternative, interchangeable, and / or equivalent structures, functions, scopes, or steps are disclosed herein, and without intending to publicly dedicate any patentable subject matter, the present disclosure is intended to obtain the right to include alternative embodiments within the allowable scope, including alternative, interchangeable, and / or equivalent structures, functions, scopes, or steps to those recited in the claims.

Claims

**Claim 1** An intraocular lens assembly comprising a base comprising a ring having a front surface and a rear surface that define a ring thickness, an outer surface that defines a ring diameter, and a pair of haptics extending from the outer surface of the ring, each haptic 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 ring-haptic junction; an optical component comprising a front side having a front surface that defines a front diameter larger than the ring diameter, a rear side comprising a rear surface, a transition region radially outward of the rear surface, a pair of sidewalls located radially outward of the transition region, each sidewall having a sidewall height, and a pair of tabs located radially outward of the transition region; each tab defines a tab height and comprises a laterally extending portion, and the tab is positioned such that when the tab is positioned at the ring-haptic junction, the laterally extending portion is positioned rearward of a rear surface of one of the pair of haptics; the intraocular lens assembly. **Claim 2** The intraocular lens assembly of claim 1, wherein the sidewall height is greater than the ring thickness. **Claim 3** The pair of haptics defines a first axis, the pair of tabs is disposed on a second axis, andpositioning each tab within the ring-haptic junction aligns the second axis with the first axis. The intraocular lens assembly of claim 1. **Claim 4** A first pair of apertures on the haptic defines the first axis, a second pair of apertures on the optical component defines the second axis, andaligning the second pair of apertures on the optical component with the first pair of apertures on the haptic aligns the second axis with the first axis. The intraocular lens assembly of claim 3. **Claim 5** Each laterally extending portion comprises a front surface, and rotation of the optical component relative to the base when the tab is positioned at the ring-haptic junction positions the tab proximate to the haptic due to contact between the front surface of the laterally extending portion and the rear surface of the haptic. The intraocular lens assembly of claim 1. **Claim 6** The intraocular lens assembly of claim 1, wherein an inner surface of the ring comprises a groove. ​ ​

7. The intraocular lens assembly according to claim 6, further comprising a second optical component positioned within the groove.

8. The intraocular lens assembly according to claim 1, wherein each haptic comprises a notch for receiving the lateral extension of each tab.

9. The intraocular lens assembly according to claim 1, wherein the front surface of each lateral extension comprises a recess for receiving a raised feature.

10. An intraocular lens (IOL) assembly, comprising: a base, comprising: a ring, having: a front surface and a rear surface defining a ring thickness; an outer surface defining a ring diameter; a pair of posts extending radially from the ring; and a ring comprising the base; an optical component, having: a front side having a front surface defining a front diameter larger than the ring diameter; a rear side, having: a rear surface having a rear surface radius of curvature; a transition region radially outside the rear surface; and a pair of side walls located radially outside the transition region, each side wall having a side wall height; and a pair of tabs extending rearwardly, each tab defining a tab height, each tab comprising a lateral extension, and the pair of tabs positioning the lateral extension behind the pair of posts when the optical component is seated on the base; and an optical component; an intraocular lens (IOL) assembly.

11. The pair of posts extend radially outward from the outer surface of the ring. The pair of tabs are located radially outside the rear surface of the optical component. The pair of tabs position the lateral extension behind the pair of posts when the optical component is seated on the base. Rotation of the optical component relative to the base causes the front surface of each lateral extension to contact the rear surface of one of the pair of posts. The IOL assembly according to claim 10.

12. The posts extend radially inward from the inner surface of the ring. The pair of tabs are located on the rear surface of the optical component. The pair of tabs position the lateral extension behind the pair of posts when the optical component is seated on the base. Rotation of the optical component relative to the base causes the front surface of each lateral extension to contact the rear surface of one of the pair of posts. The IOL assembly according to claim 10.

13. The pair of posts define a first axis. The pair of tabs define a second axis. Coupling the pair of tabs to the pair of posts aligns the second axis with the first axis. The IOL assembly of claim 10. **Claim 14** The IOL assembly of claim 10, wherein the width of the transition region is substantially equal to the width of the ring.

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