CA2635716A1

CA2635716A1 - Accommodating intraocular lens with outer support structure

Info

Publication number: CA2635716A1
Application number: CA002635716A
Authority: CA
Inventors: Daniel G. Brady; Arlene E. Gwon
Original assignee: Individual
Current assignee: Johnson and Johnson Surgical Vision Inc
Priority date: 2005-12-28
Filing date: 2006-12-06
Publication date: 2007-07-12
Anticipated expiration: 2026-12-06
Also published as: US20060161252A1; EP1965734A1; WO2007079315A1; EP1965734B1; US8343216B2; US7763069B2; CA2635716C; US20110054602A1; US9504560B2; US20170065405A1; US20140012375A1; AU2006332628A1; AU2006332628B2

Abstract

An intraocular lens (300) for insertion into the capsular bag of an eye contains an optic (302), an outer periphery, and an outer support structure (304). The optic has a periphery and centered about an optical axis. The outer periphery is disposed about the optic and configured to engage an equatorial region of the capsular bag of an eye. The outer support structure is disposed along the periphery and spaced from the optic with voids outer support structure and the optic. The intraocular lens further comprises a first intermediate member ( 308) and a weakened region (310) disposed along the outer periphery between the outer support structure and the first intermediate member. The first intermediate member operably couples the optic and the outer support structure. The weakened region is attached to and configured to provide relative motion between, the outer support structure and the first intermediate member in response to the ciliary muscle of the eye.

Description

ACCOMMODATING INTRAOCULAR LENS WITH OUTER SUPPORT
STRUCTURE

I2elated Application This application is a Continuation-In-Part application of U.S. patent application Ser.
No. 10/661,401, filed Sept. 12, 2003 and of U.S. patent application Ser. No.
10/341,701, filed Jan. 14, 2003, which claimed the benefit of provisional application Serial No.
60/348,705, filed Jan. 14, 2002, and provisional application Serial No. 60/372,309, filed Apr. 12, 2002.
Background of tl~ze Invention The present invention relates to intraocular lenses (IOLs). More particularly, the pxesent invention relates to IOLs that provide accornm.odating movement in the eye.
The human visual system includes the eyes, the ex,traacular muscles which control eye position within the eye socket, the optic and other nerves that connect the eyes to the brain, and particular areas of the brain that are in neural communication with the eyes. Ea.cb eye foims an image upon a vast airay of light sensitive photoreceptors of the retina. The cornea is the primary refracting surface which admits light through the anterior part of the outer surface of the eye. The iris contains muscles which alter the size of the entrance port of the eye, or pupil. The crystalline lens has a variable shape within the capsular bag, under the indirect control of the ciliary rnuscle. Having a reftactive index higher than the surrounding media, the crystalline lens gives the eye a varia.ble focal length, allowing accommodation to objects at varying distances fxozn the eye.
Much of the remainder of the eye is filled with fluids and materials under pressure which help the eye maintain its shape. For exainple, the aqueous humor fills the anterior chamber between the cornea and the iris, and the vitreous humor fills the majority of the volume of the eye in the vitreous chamber behind tlae lens. The crystalline lens is contained within a third chamber of the eye, the posterior chamber, which is positioned between the anterior and vitreous chambers.
The human eye is susceptible to nuxnerous disorders and diseases, a num'ber.of which attack the crysta.lline lens. For example, cataracts mar vision through cloudy or opaque discoloration of the lens of the eye_ Cataracts often result in partial or corn.plete blindness. If this is the case, the crystalline lens can be removed and replaced with an intxa.ocular lens, or I+pL.

While restoring vision, conventional ZOLs have limited ability for accommodation (i.e., the focusing on near objects). This condition is known as presbyopia.
To overcome presbyopia of an IOL, a patient may be prescribed eyeglasses. Alternative attempts in the art to overcome presbyopia focus on providing YOLs with accommodation ability.
Accornmodation may be aecomplished by either changing the shape of at least one optic surface of the TOL, by moving the lOL along its optical axis, or some combination of the two.
These and similar approaches for providing accommodation are disclosed, for example, in the following U.S. patents and patent applications, all of which are herein incozpoXated by referenee: 4,373,218; 4,601,545; 4,816,031; 4,892,543; 4,994,083; 5,066,301;
5,108,429;
5,171,266; 5,203,788; 6,176,878; 6,406,494; 6,443,985; 6,599,317; 6,616,692;
6,638,305;
6,645,246; 2003/0060881; 200310158599; 2004/0034415; 2004/0082993;
2005/0131535; and U.S. patent application Serial No. 09/656,661, filed in September 7, 2000.
Despite these various devices and method of providing accommodation, there continues to be a need, to provide new IOLs with enhanced accommodative capabi3ities.
Summary of the Invention ln one aspect of the invention, air intraocular lons for insertion into the capsular bag of an eye comprises an optic, an outer periphery, an outer support structure. The optic has a periphery and centered about an optical axis. The outer periphery is configured to engage an equatorial region of the capsular bag of an eye and the outer support structure is disposed along the outer periphery of the intraocular lens and is spaced from the optic with voids tlierebetween. The intraocular lens further comprises a first intermediate mezn.ber operably coupled to the optic and the outer support structure. The intraocular lens also comprises first and second weakened regions disposed along the outer periphery. Each of the weakened regions may be disposed between the outer support structure and the first intermediate member. The weakened regions are configured to allow relative motion between the outer support structure and the first intermediate meinber in response to the ciliary anuscle of the eye. In certain embodiments, the relative motion is an angular motiori between the first intei-mediate member and the outer support structure.
In certain embodiments, the outer support structure surrounds or entii-ely surrounds the optic and/or the intermediate mem:bers. In other embodiments, the outer support structure is connected to distal ends of the first and second intennediate members. In such em.bodirnents, the weakened regions are disposed along the outer periphery to either side of andlor proximal to the distal eiids. The outer periphery may be ciroulax or elliptical or soine other shape that is suited for insertion into the eye, for example, into the capsular bag.

2 In another aspect of the inveaation, the intraocular Iens further conaprises a second, or even three or more, intermediate member(s) extend'ang between and operably coupling the optic and the outer support structure. In such einbodirn.ents, the intraocular lens may comprise first weakened regions disposed along the outer peripheiy between the outer support structure and the intermediate =mbers, as well as second weakened regions disposed along the outer periphery between the outer support structure and the in.texnaediate members. The first and second weakened regions may be conf'igctred to allow angular motion between the outer support structure and the interrnediate members in respol'ise to the ciliary inuscle and/or capsular bag. In some embodiments, the outer support structure further comprises at least one intermediate weakened region circurrri'erential.ly disposed belween intermediate members. The intermediate weakened regions may be circumferentially disposed equidistant between intermediate members or otherwise disposed to provide a predetermined per~ormance of the outer suppoi-t structure or intraocular lens when the outer siapport structure is compressed or stretched.
The weakened regions may be configured or formed in various way to provide the predetermined perforrnance of the outer support structure or intraocular lens.
For example, one or more of the weakened regions may comprise a hinge. Also, one or naore of the weakened regions may have a radial thickness that is less than a radial thickness of the outer support structure in a region proximal the at least one weakened region.
Additionally or a.lternatively, the weakened regions may have a thickness along the optical axis that is less than a thickness along the optical axis of the outer support structure in a region proximal the at least one weakened region. In some embodiments, the outer support structure is made of a first material and at least one of the wealcened i-egions is made of a second material that is rnore bexidable than the first nxaterial_ In yet another aspect of the invention, the outer support structure comprises a first artn and the secozad arm with a void therebetween. In such er-abod.iments, at least a portion of the first arn7 inay be slidably disposed to at least a portion of the second arua.
Anot.her aspect of the invent.ion involves an intraocular lens for insertion into the capsular bag of an eye comprising an optic, an outer support structure having an outer periphery, a first intermediate meinber, and a weakened region disposed proximal to the first intermediate member and along the outer periphery of the intraocular lens. The optic has a periphery and is centered about an optical axis. The first intermediate member extends between and is operably coupled to the optic and the outer support structure.
The outer support structure entirely and continuously surrounds the optic and is spaced frorn the optic

3 and there are one or more voids between the outer support structure and the optic. The outer support stiveture is configured to engage an equatorial region o-P the capsular bag of an eye.
The weakened region is configured to allow relative motion between the outer support structure and the first intermediate member in response to the ciliary muscle of the eye.
Each and every feature described herein, and each and every cornbination of two or more of such features, is included within the scope of the present invention provided that the features included in such a conibination are not mutually inconsistent.
Brief Description of the Drawinas Additional aspects, features, and advantages of the present invention are set forth in the following description and claims, pa~rticularly when considered in conjunction with the accompanying drawings in which like parts bear like reference numbers.
FIG. l. is a vertical cross-section of an eye illustrating an exea-nplary intraocular lens of the present invention laositioried within the capsular bag;
FIG. 2 is a cross-section similar to FIG. ! showing foivvard or anterior movement of an optic of the intraocular lens;
FIG. 3 is a plan view of the exemplary intraocular lens of the present invention having an oval outer ring and a.pair of nonlinear intermed'rate mernbers;
FIG. 4 is a plan view of an alternative intraoculax lens of the present invention having two radially oriented intermediate members;
FIG. 5 is a plan view of an alternative intraocular lens of the present invention having three radially oriented intermediate members;
FIG. 6 is a perspective view of an alternative intraocular lens of the present invention having three radially oriented intermediate znernbers;
FIG. 6A is an elevational view of one edge of the intraocular lens of FIG. 6;
FIG. 7A is a perspective posterior view of a still further alternative intraocular lens of the present invention having three radially oriented plate-like intermediate members and an optic that is bowed slightly out of the plane of a surround.ing capsular bag support ring;
FIG. 7B is a perspective anterior view of the intraocular lens of FIG. 7A;
FIGS. 7C and 7D are plan and side elevation.al views, respectively, of the intraocular lens of FIG. 7A;
FIG. 7E is a sectional view taken through line 7E-7E of FIG. 713;
FIG. 8A is a perspective view of a still further alternative intraocular lens of the present invention having two radially oriented plate-like intermediate members connecting a central optic to an oval surrounding capsular bag support ring;

4

5 PCT/US2006/061671 FIG. 8B is another perspective view of the intraocular lens of FIG. 8A; and FIGS. 8C and 8D are side elevational and plan views, respectively, of the intraocular lens of FIG. 8A.
FIG. 9 is a plan view of another alternate embodiment of the invention;
FIG. 10 is a plan view of still another alternate einbodiment of the invention;
FIG. ,L 1 is a plan view of an outer ring according to yet another embodiment of the invention;
FIG. 12 is a plan view of an outer ring according to anotlier enZ'bodittient of the invention; and FIG. 13 is a plan view of a outer ring according to still another embodiment of tl--e invention;
FIG. 14 is a plan view of a outer ring according to still another embodiment of the invention;
FIG. 15 is a fragmentary perspective posterior view showing a portion of a support ring structured to bend in an anterior direction;
FIG. 16 is a fragmentary perspective anterior view showing a support ring structured to bend in a posterior direction;
FIG. 17 is a view similar to FIG. 7B, showing an embodiment of the invention having an alternate hinge configuration;
FIG. 18A is an anterior plan view showing yet another embodiment of an intraocular lens according to the pxesent invention;
FIG. 18B is a sectional view taken through line B-B of FIG. 18A;
FIG. 18C is a sectional view taken through line C-C of FIG. 18A; and FIG. 19 is a fragmentary perspective anterior view showing a support ring structured to bend both posteriorly and radially outwardly.
FIG. 20 is a plan view of an IOL having weakened portions according to ei.nbodirnents of the present invention.
FIG. 21 is a plan view of another embodiment of an IOL having weakened portions.
FIG. 22 is a plan view of an IOL havin.g weakened portions made of a different material than other portion of the IOL.
FIG. 23 is a plan view of an IOL having weakened portions and a void between arrrxs of the TiOL.
FIG, 24 is a plan view of another embodiment of an IOL having weakened portions and a void between arms of the IOI..

FIG. 25 is a plan view of an IOL having a circular outer support ring and weakened portions.
FIG. 26 is a side view of an optic from an IOL according to embodiinents of the invention wherein the optic is not compressed.
FIG. 27 is a side view of an optic from an TOX.. according to embodiments of the invention wherein the optic is compressecl.
Detailed Description of the DrawLn~s Referring to the drawings in i-nore detail, an intraocular lens (IOL) 20 according to an exeinplaiy embodiment of the pr.esent invention is illustrated in FIGS. I and.
2 after implantation in the capsular bag 22 of an eye. Exemplaiy IOL 20 includes an optic 24 and a inovernent assembly 26 coupled thereto. The optic 24, which has an optical axis OA, is adapted to focus light onto a retina of an eye. The movement assembly 26 of exemplary JOL
cooperates with the eye to effect accoraamodating anovezx-ent of the optic 24 and, in particular, converts radial movement (i.e., movement perpendicular to the optical axis OA) of 15 the capsular bag of an eye to axial movement (i.e., movement parallel to the optical axis OA) of the optic 24. In the exemplaty embodiment, the movement assembly 26 biases the optic 24 in a posterior d'zrection (to the right) against the posterior wall of the capsular bag 22.
With further reference to FIG. 3, which illustrates the exemplary IOL 20 in plan view, the optic 24 comprises a generally circular periphery or per-ipheral edge 42 that defines the 20 radially outer extent of the optic 24 and separates a posterior face from an anterior face. The optic 24 is typically circular, but may exhxbit a diifferent shape as long as the optical -correction character is centered about the optical axis OA. The optic 24 may be bi-convex, or the anterior and posterior faces can take other shapes, such as planar or concave. In any event, the posterior face and anterior face are spaced apart on opposite sides of an optic plane (not slzown) that extends perpendicular to the optical axis OA. In other words, the optic 24 is centered on and oriented in the optic plane.
The movement assembty 26 may further comprise a pair of intermediate meYnbers 50a, SOb connected to and extending between the circular periphery 42 of the optic 24 and an outer ring 52. Each intermediate member 50a, 50b lias an inner end 54 connected to the circular periphery 42, and an outer end 56 connected to the outer ring 52. As used herein in this context, the term "connected" means firi-oly attached to, for example, by using an adhesive or ultrasonic bond, by forming integrally, or by for7ning as a cohesive single piece.
In the latter case, the lens is desirably molded. Each intermed'zate inernber 50a, 50b is desirably oriented in a plane that is in the optic plane. Indeed, the intermediate rnembers 50a,

6 50b and outer ring 52 may have approxirnately the same thickness and be located in the same plane.
A brief description of the anatomy of the eye is appropriate in order to understand the invention. The capsular bag 22 resides in the posterior chamber of the eye and is in direct contact with the jelly-like vitreous humor 28 which fills tlie nearly sphexzcal space between the capsular bag and the retina (not showri). In a healthy person, the capsular bag 22 contains the natural crystalline lens which transmits light passing through the orifice of the iris 30 to the relina. The capsular bag 22 is connected to an annular ciliary muscle 34 by suspensory ligaments or zonules 36. The ciliary muscle 34 is the chief agent in .accommod.ation, i.e., in adjusting the eye ta focus o7n near objects. The zonules 36 retain the lens in posi.tion and are relaxed by the contraction of the ciliary muscle 34, thereby allowing a natural crystalline lens to becorne more convex.
In certain embodiments, the optic 24 is monofoeal optic. In such embodiments, the anteriar and posterior surfaces of the optic 24 may have spherical prcafiles.
Altex-natively, at least oize of the anterior and posterior surfaces of the optic 24 may have an asphei-ic profile, for exax-nple, as discussed in U.S. Patent Number 6,609,793, which is herein incorporated by reference. In other exnbodir.nents, the optic 24 is a rnultifocal optic baving a plurality of zones of varying optical powers, wlierein the naaximuin add power of the rEear zones is reduced by an axnount equivalent to the diopter shift obtained thxough axial movement of the optic 24.
Thus, the net power correction in the near zones is equal to the patient's full add prescription only when optic 24 has moved to the near distance (i.e., anteriorrnost) position. 'Examples of suitable multifocal optics are disclosed in Lang et al. U.S. Pat. No.
6,231,603 and Lang et al.
PCT International Application No. WO/01/82839 Al. The disclosures of both the U.S_ patent and the PCT international application are incorporated in their entireties herein by zeference_ Although controlled fibrosis (i.e., cellular growth) on the outer ring 52 may be desirable, the fOLs 20 of the invention inhibit cell growth, particularly epithelial cell growth, onto the optic 24. This is accomplished by configuring the periphery 42 of the optic 24 with mechanical barriers such as relatively sharp posterior and/or anterior edge corners, for example, as disclosed in U.S. Patent Numbers 6,162,249, 6,468,306, and 6,884,262. The proliferation of unwanted epithelial cell growth may also be inhibited through the use of material properties.
The inteirnediate inembers 50a, 50b ofthe IOL 20 are substantially longer than previous intermediate members as they extend in a nonlinear fashxon from the outer ring 52

7 to the circular optic periphery 42. More particularly, the inner end 54 and outer end 56 are angularly spaced about the optical axis OA by at least approximately 90 degrees. The mid-portio-n of each interrnedxate member SO extends in a serpentine fashion between its inner and outer ends.
In certain erribodiments, as seen in FIG. 3, the outer ring 52 is oval in shape and has a major axis 60 perpendicular to the optical axis OA. A minor axis 62 extends perpendicularly to the major axis 60 and to the optical axis OA. Desirably, the outer ends 56 of the intermediate rneznbers 50 connect to the oval ring 52 along th.e major axis 60_ In this way, the length of the intermediate members 50 is maximized.. In the illustrated embodiment, the inner ends 54 of the intermediate members 50 connect to the cir-cular optic periphery 42 along the minor axis 62. Therefore, the inner and outer ends 54, 56 are angularly spaced apart by about 90 degrees.
FIG. 4 illustrates an alternative IOL 70 of the present invention having an optic 72, an oval outer ring 74, and a pair of intermediate members 76a, 76b extending radially therebetween. Again, the optic 72, outer ring 74 and intermediate members 76a, 7Gb are desirably forrned as a single homogeneous (i.e., integral) piece. In certain embodiments, the oval outer ring 74 may move the optic 72 axially with grea.ter effectiveness than a circular ring because of the orientation of the intermediate rrzezxzbers 76a,b along the major axis.
The fixation tnembers 76a,b are shown as piate-like, and desirably are greater in width (the dimension parallel to the minor axis) than axial thickness (the dimension parallel to the optical axis). Preferably, the ratio of width to axial thickness is about four. In absolute terms, the width of the fixation members 76a, 76b may be between about 0.8 mm and about 3.0 nun.
FIG. 5 illustrates a still further IOL 80 having an optic 82, an outer ring 84, and tlzree evenly arranged and radially oriented intermediate members 86a, 86b and 86c.
Because the intermediate members 86 are not syminetric about any plane through the optical axis OA, forces exerted by the surrounding capsular bag do not act in oppositian to one another and thus may be translated more effectively into axial movement of the optic 82.
The radial thickness tr of the outes ring 84 is indicated, and is desirably in the range of 0.2-0.6 rnm.
Moreover, the corners, ox at least one corner, of the outer peXipheral edge of the outer ring 84 are desirably relatively sharp to reduce the instance of epitttielial cell growth thereon.
FIGS. 6 and 6A illustrate a still further IC?Ir 90 of the present invention having an optic 92, a plurality of intermediate members 94 extending radially outward therefrom, and an outer ring 96. The edge surface 97 of the outer ring 96 may be contoured to conform to

8 the inner wall of the capsular bag. Therefore, as seen in FIG. 6A, at least a portion 98 of the edge surface 97 is convexly outwardly curved. At the same time, at least one corner, in this case the posteiior corner 99, is left shaip (i.e., unpolished) to form a barrier against posterior capsular olaacification (PCO).
Furthermore, p'XG. 6 illustrates the greater axial thickness tõ of the outer i-ing 96 with respect to the axial thickness of the intermediate meinbffrs 94 and optic 92.
Specifically, the axial thtckness ta of the outer ring 96 is desirably between about 0.4 mm and about 1.0 mm.
Without wishing to limit the invention to any particular theory of operation, it is believed that a ring having an axial thickness in this range will place both the posterior and the anterior 2onutes of the eye under tension. Thus, both setS of zonules work in unison to change the diameter of the capsular bag in response to action of the ciliary zxiuscle, resulting in axial movement of the optic. In some embodiments, a thinner ring would not interact as effectively with both sets of zonules, and thus, in all likelihood, would result in less axial movement.
Li addi.tion, an outer ring 96 having increased axial thickness will increase the pressure on the sharp corner 99 of the edge surface 97 to increa.se the barrier effect of the ring against PCO.
FIGS. 7A.-7E show another lOL 100 of the present invention having a circular outer capsular bag support ring 102, an inner optic 104, and a movement system comprising a plurality of radially-oriented plate-lilCe interniediate members 106 extendiilg therebetween.
Preferably, the optic 104, whether it be bi-convex or otherwise, is circumscribed by a circular rim 105 to which the fixation intei7nediate members 106 are directly attached.
The i-im 105 desirably has a constant axial dimension and helps to reduce glare while not increasing incision size.
Movement systerns other than that shown may be suitable, such as a more solid interface rather than discrete intermediate members. However, separated intermediate members with voids therebetween and between the optic 104 and support ring 102 are preferred. The support ring 102, inner optic 104, and intermediate meinbers 106 are firmly attached to each other with adhesive or ultrasonic bonding, or preferably formed integrally, i.e., molded or machined as one cohesive (homogeneous) piece of rnateiial. The IOL 100 is desirably liquid injection molded frorrz silicone or machined from a hydrophilic rnaterial which fabrication proeess reduces cost and inexeases quality ancUor consistency of the product.

9 FIG. 7.A. illustrates the IOL 100 froin the posteiior side, while FZG. 713 is an anterior view. These two views show the axial position at which the intermedxate members 106 attach to the support ring 102. That is, the support ring 102 has an axial dimension and the intermediate members 106 attach to a posterior edge thereof. When implanted, the intermediate members 106 and connected optic 104 are thei-efore held in a postexior-rnost position with respect to the support ring 102.
As in the embodiment of FIG. 6, the edge surface of the outer ring 102 is contourecl to facilitate iinplantation within the capsular bag of the patient. More particularly, the support ring 102 has an outer surface that is convexly curved, to better mate with the concave inner wall portion of the capsular bag between ttie anterior and posterior zonules.
With reference to FIGS. 7C and 7E, the interrr-ediate members 106 cornprise a radially inner portion 108, a radially outer portion I 10, and a hinge 112 therebetween. The inner and outer portions 108, 110 are generally plate-like having larger circumferential dimensions than axial dimensions. T he hinge 112 may be formed in a nutnber of ways, and as illustrated coxxaprises a r,egion wberein both the axial and the circumferential thickness are reduced by about 50% with respect to the inner and outer portions 108, 110.
Alternatively, only one of the axial and the circumferential thicknesses are reduced as compared to the remaining portions of the interrrtecliate member 106. The reduced znaterial at the hinge 112 rneans that it is weaker than the remaining portions of the interrreediate member and thus will more easily bend at that location. In other embodiments, the hinge 112 has the same axial and the circumferential thickness as the remaining portions of the intermediate member 106.
In such embodiments, the hinge 112 may be made of a different material or from the same material that is processed differently from the remaining portions of the inteiTnediate meTnber 106 (e.g., with a differing amount of polymerization). The location of each hinge 112 i.s desirabty tI-te sam.e for all of the fixation intennediate meinbers 106, and preferably is closer to the support r-ing 102 than to the optic 104. Foi- example, each hinge 11.2 rnay be located about 60% of the way from the optic 104 to the support ring 102. In some embodiments, the interrrtediate member 106 has no distinct hixtge sucb as the hinge 112, for example, as illustrated in FIGS. 4 and 5 for the IOLs 70 and 80, respectively. In such embodirrzents, the entire intermediate member (e.g., intermediate members 76a or 86a) may bend to allow the optic of the IOL to translate anteriorly and posteriorly in response to the ciliary rnuscie 34.
FIG, 7I? illustrates the IOL 100 in an elevational view wherein the support ring I02 lies substantially in a plane and the optic 104 projects in a posterior direction therefrom by virtue of the shape of the intermediate members 106. Specifically, the intermediate members 106 are bowed slightly in the posterior direction such that the optic 104 will tend to lie against or closely adjacent to the posterior wall of the capsular bag.
Relaxation of the ciliary muscles 34 surrounding the capsular bag 22 eithcr moves the optic 104 or changes the posterior bias imparted thereto by the intermediate members 106. As a result, the vitreous huxnor behind the capsular bag can move the optic 106 so as to allow a subject to focus both on distant and relatively near objects.
In one exeznplary ernbodinient, tlte support ring 102 bas a diameter of between about 9.0-10.5 mm, and an axial thickness of about 0.7 mm. Furthermore, the support ring 102 -has a curvature that mimics the curvature of the natural capsular bag between tlle anterior a3ld posterior zonules, which cuivature is between about 0.3-1.0 mm. As mentioned above, at least one corn.er edge of the ou.ter ring is left sharp to help prevent cell growth thereon. In other embodiments, the support ring 102 may be sized to have a diameter that provides a predetermined fit within the capsular bag 22, for example when the eye is in an accommodative state, a disaccommodative state, or a state somewhere betwcen the accomnnodative and disaceoinmodative states. IOLs 100 may be configured to have a plurality of diameters to provide a predetermined fit within different size capsular bags 22 for different eyes. Preferably, the diameter of the support ring 102 is between about 8 mm and at least about 13 mm, more preferably between 8 znrn and 12 mm, and even more preferably between 9 mm and 1 I mm.
Although three radial intermediate members 106 are illustrated 120 degrees apart, the configuration of the intermediate arneznbers 106 may vary. However, two factors that are believed to facilitate axial -m.oveznent, or accommodation, of the optic 104 are the tripod orientation and presezace of the hinges 112. More specifically, inward radial forces from the -surrounding ciliary muscle 34 and interrnediary zonules 36 are transmitted from the support ring 102 through the intermediate meinbers 106 to the optic 104. Because the intermediate members 106 are oriented so that none is diametrically opposed to another, there are no directly opposing forces and a larger component therefore translates into axial movement of the optic 104.
'ne intermediate members 106 are plate,like to increase stability of the lens in the cye. That is, the forces imparted by the surround'ang ciliary muscle 34 may not be entirely uniforrn and may exert torsional forces on the iens. Plate-like intermediate rnembers 106 help resist twisting of the lens and thus increase stability. The circutnferential thickness, or width, of the interinediate rneinbers 106 may be between about 1.5-4.0 mm, and the axial thickness is desirably between about 0.2-0.5 rnm.

FIG. 17 shows an alternate ernbodirnent of an IOL 102' substantially similar to the embodiment of FIGS. 7A-7E, except that the thickness of the hinge portion 112' is reduced in the axial direction only. That is, the circumferential thickness, or width, of each plate-like intermediate member 106' is uniforzn throughout its length. This hinge configuration has been found to be less susceptible to fibrosis than a hinge configuration having reduced thickness in the circumferential direction.
Another alternative IOL 120 of the present invention is seen in FIGS. 8A-8D.
As in an earlier embodiY-nent, there are only two intex-mediate members 122 extending between an oval shaped outer capsular bag support ring 124 and an inner circular optic 126. fn the illustrated emlaocliment, the outer ring 124 comprises a band having a generally rectangular cross-section with a longer axial than radial dimension. Preferably, at least one corner of the oLiter ring 124 is sharp to prevent epithelial cell growth thereon. The support ring 124, inner optic 126, a.nd internned'zate members 122 are firmly attached to each other with adhesive or ultrasonic bonding, or preferably formed integrally, i.e., xraolded or machined as a cohesive s1iigle piece. 'I'I]e IOI.. 120 is desirably liquid Izijectaoii molded'frotxi silicone or ntacllzned from a hyd.rol?liilic material which, again, rediices cost and increases cIt-ality anclJor consistency of the product.
As seen best in FIG. 8D, the oval outer ring 124 has a rnajor axis 121 and a rninor axis 123, and the two internxediate members 122 are diametrically opposed across the optic 126 along the major axis 123. In one exemplary ernbodiment, t11e support ring 124 has a major diameter of between about 115-135 l0 of the minor diameter.
The inten-nediate members 122 are plate-like, each having a relatively larger circumferential than axial dimension. In contrast to the IOL 100 of FIGS. 7A-7D, the intermediate members 1221ie in a plane defined by the oval-shaped outer ring 124, and thus the optic 12G is not bowed either way. Furthermoxe, the intermediate members 122 are joined to the inner surface of the outer ring 124 at approxixnately the axial midpoint thereof.
Therefore, in contrast to the earlier embodiment, the optic 126 is not positioned or biased to favor rnovenraent in one direction or the other.
With reference to FIG. 8A, each intermediate mernber 122 has a hinge 128 therein located closer to the outer ring 124 than to the optic 126. The location of each hinge 128 is desirably the sanie for all of the inÃennediate meinbers 122, a.nd preferably is located about 75% or more of the way from the optic 126 to the support ring 124. Empirical detei-mination of hinge 128 location optimizes the design such that less radial and axial compression force is required to axially translate the optic 126, while at the same time the ability of the lens to resist twisting is not adversely affected_ In the illustrated embodiment, these hinges 128 are formed by reduced axial thickness portions along each intermediate meznber 122. For example, curved troughs on both sides of intermediate members 122 as shown may form the hinges. Alternatively, or in addition, the circumferential dimension of each intermediate member 122 may be reduced.
As with the earlier embodiment, the optic 126, whether it be biconvex or otherwise, is recessed ('rom a circular rim 130 to which the inten-raediate members 122 are directly attached. The rim 130 is slightly tapered downward toward the optic and helps reduce glare on the lens. Desirably, the maximum axial dimension of the rim 130 is greater than the center thickness of the optic 126. Advantageously, a reduced center thickness permits a reduction in incision size.
FIGS. 18A-18C show an alternate embodiment of an I L 120' similar to the ernbodirnent of FIGS. 8A-81), except that the optic 126' is multifocal, and oval support ring 124' has a non-uniforni cross-sectional area. Alternatively, the optic 126' may be a monofocal optic, as disciissed elsewbere herein. In the illustrated embodiment, the radial thickness of the support ring 124 increases from a minimum value t,-1, for instance about 0.2 mm, at diametrically opposed locations 125a and 125b along the rrtinor axis 121', to a maxirnum value t,2, for instance about 0.6 mm, at diametrically opposed locations along the xnajor axis 123', where the intermediate members 122' are secured to the ring 124'. In addition, the axial thickness ta of the ring 124' is constant throughout the entire circuznference of the ring 124' and has a value greater than the maximum radial thickness t,.2.
The circumferential thickness, or width, of each intermediate menzber 122' is also non-uniform throughout its lengthT for instance decreasing in a non-linear fashion from a maximum width where the interiraediate meml3er 122' joins the circular rim 130' of the optic 126' to a minilnurn width at the hinge 128', and remaining substantially constant between the hinge 128' and the outer ring 124'. This parLicular c:Onfiguration of the oval outer ring 124' and intermediate members 122' has been .found to be particularly stable, with miniinal "flopping", twistitig, or other unwanted i-novernent, of the thinnest portions 125a and 125b of the o ter ring 124'.
FIGS. 9-16 and 19-25 show alternate embodiments of the invention wherein the support ring includes weakened portions configured to allow the ring to allow consistent and repeatable deformation duiing compression.
FIG. 9 shows an IOL 131 having an optic 132, an outer iing 134, and a pair of plate-like intermediate znembers 136a and 136b. The intermediate members 136a and 136b are shown without hinges, similar to the intermediate members 76a and 76b of FIG.
4, although hinged internnediate rnembers could also be used. The outer ring 134 is generally oval, with two generally arcuate ends 138, 140 that rnerge with the distal ends of the intermediate members 136a and 136b, respectively, and two elongated leg portions 142, 144 that extend parallel to a major axis 146 of the outer ring 134 along opposite sides of the optic 132 A. weakened portion 146a, b is formed in each leg portion 142, 144 at a location along the minor axis 147 of the support ring 134, such that each weakened portion 146a, b is 180 degrees away from the other weakened portion 146a, b and equidistant frora the arcuate ends 138, 140 of the outer ring 134. Each weakened portion 146a, b is in the form of a thinned area in one of the legs 142, 144, the thinned area being created, in this embodiment, by pro-viding a generally C-shaped indentation 148a, b on each side of the leg.
This configuration ensures that any bending or buckling of the outer ring 134 as a result of compressive forces on the distal ends 138, 140 of the outer ring 134 will occur at the weakened portions rather than elsewhere along the outer ring 134. In some embodirnents, the outer ring 134 comprises only one of indentations 148a, b. In yet other embodirrrents, the outer ring 134 coixrpaxses two or more weakened portions 146a and two or more weakened portions 146b in order cause the outer ring 134 to deform in a predeter.rnined manner in response to the ciliary muscle 34. In such embodiments, the shape of each of at least some of the weakened portions 146a, b rnay be different frorn the shape of others of the weakened portions 146a, b in order to produce the desired response to the ciliary muscle 34.
FIG. 10 shows an IOL 150, generally similar to IOL 80 of FIG. 5, comprising an optic 152, a circular outer ring 154 and three evenly aiYanged and radially oriented intermediate members 156a, 156b, and 156c, which may be hingeless as shown, or hinged, for example, as in the embodiment of FIGS. 7A-7D. The support ring 154 includes three weakened areas 158a, b, c provided 120 degrees from one another and radially equidistant from the intern-lediate meinbers 156a, 156b, and 156. Again, the weakened areas 158a, b, and c, which are shown here as C-shaped indentations on each side of the outer ring 154, are configured to ensure that any bending or buckling of the outer ring 154 occurs at the three weakened area only, rather than at other locations along the ring. In some embodiments, there may be two or more weaken areas 158a, b, and c betweGn each of the intermediate members 156a, 156b, and 156c in order to the outer ring 154 to deform in a predetennined i-nanner in response to the ciliary muscle 34.
FIG. 11 shows an outer ring 160 according to an alternate embodin-:ent of the invention wherein the weakened ai-eas 162a and 162b are in the fornn of V-shaped indentations or grooves in the outer circumferential surface 163 of the outer ring 160. An outer ring 160 llaving this configuration will tend to bend or buckle in a radially inward d.irection at the two weakened areas 162a and 162b when the outer ring 170 is subjected to compressive forces_ FIG. 12 shows an outer ring 164 according to another embodiment of the irnvention wherein the weakened areas 166a and 166b are in the form of U-shaped indentations or grooves fox-ir-ed in thc inner ci-rcumferen.tial sux ~ace 168 of the outer ring 164. An outer ring 164 having this configuration will tend to bend or buckle in a radially outward direction at the two weakened areas 166a and 166b when the outer ring 164 is subjected to radially compressive forces.
In still another embodinient of the invention, shown in FIG. 13, the outer ring 170 is provided with four symmetrically arranged weakened areas 172a, b, c, and d, each in the form of a slit or notch in the outer cizcumferential surface 174 of the outer ring 170. An outer ring 170 having this configuration will tend to bend or buckle in a radially inward direction at the four weakened areas when the outer ring 170 is subjected to radially compressive forces.
In yet another ernbodirnent, sbown ir? Fl~''x. 14, a circular outer ring 176 is provided with two thinned areas 178a and 178b on diametrically opposite locations on the ring. Each tliinned area is formed by providing a pair of U-shaped grooves or indentations in the ring 176, e=_ach pair consisting of a fizst indentation 180a in the outer circumferential surface 182 of the outer ring 176 and a second indentation 1:80b in the inner circunaferential surface 184 of the outer ring 176.
FIG. 15 is an enlarged fraginentary perspective view showing a weakened portion 186 according to still another embodiment of the inventzon. In this embodiment, the weakened portion 186 comprises a thinned area, notch, indentation or groove formed in the postet7ior face I 88 of tlze outei: ring 190. An outer ring 19(} having a plurality of weakened portions 186 configured in this way will tend to bend in an anterior direction (towards the cornea) at each of the weakened portions when subjected to radially compressive forces.
AlternaÃively, a weakened portion 192 according to another embodiment of the invention inay comprise a thinned area, notch, indentation or groove formed in the anterior face 194 of the outer ring 196, as shown in F1G- 16. An outer ring 196 having a plurality of weakened portions 192 configured in this way will tend to bend in an postez'ior direction (away from the cornea) at each of the weakened portions when subjected to radially compressive forces.

FIG. 19 shows yet another embodiinent of the invention wherein a weakened portion 198 is configured to cause bending in both a posterior and a radially outward direction.
Although the weakened portion 198 is shown as a single notch foimed at the corner 200 between the anterior surface 202 and the inner circumferential surface 204, it could also be formed as a pair of intersecting notclies, grooves or indentations, one extending entirely across the anterior surface 202 and the otber extending entirely across t1ie inner circumferential surfa.ce 204, or any other equivaleiZ t configuration.
A weakened portion or portaons could also be formed on any other combination or intersection of surfaces, for instance at a corner between a posterior surface and an outer eircumferential surface to cause bending in anterior and radially inward directions, or at a corner between an anterior surface and an outer circurrtferential surface to cause bending in posterior and radially inward directions. Various other combinations of weakened portions will be readily apparent to the skilled practitioner, but for reasons of brevity will not be illustrated here.
FIG. 20 illustrates still another en-ibodiment of the invention wherein an IOL

comprises an optic 302 having a periphery 303 and centered about an optical axis OA, an outer support structure 304 disposed about the optic 302 and spaced therefrom, and first and second interxxrediate members 308a, 308b extending between and operably coupling (and/or directly connected to) the optic 302 and the outer support structure 304. The outer support structure 304 is disposed along an outer periphery 305 of the IOL 300 and is configlrred to engage an equatorial region of the capsular bag 22. The outer support structure 304 may entirely and continuously surround the optic 302. That is, the outer support structure 304 may form a closed or unbroken ring or loop completely around the optic 302. In some embodiments, the outer support structure 304 is coupled or attached to the first and/or second intermediate rnembers 3{}9a, b. For example, the outer support structure 304 may be connected to distal ends 311 of the first and second intermediate m.embers 308a, b. In such embodiments, the weakened regions 310a, b may be disposed along the outer periphery 305 to either side of and/or proximal to the distal ends 311.
The IOL 300 further coinprises one or mora weakened regions, for example, the first and second weakened regions 310a, b shown in FIG. 20, disposed along the outet periphery 305 between the outer support structure 304 and the first and second intermediate rnembers 308a, b. The first and second weakened regions 310a, b are attached to the outer support structure 304 and th.e first and second intermediate mernbers 308a, b. The first and second weakened regions 310a, b are also configured to provide relative inotion between the outer support structure 304 and the first and second irzterrraediate members 308a, b in response to the ciliary muscle 34.
The weakened regions 31Oa, b are generally configured to allow angular motion between the first intermediate member 308a and the outer support structure 304 in response to the ciliary tiiuscle 34. Depending upon the structure of the weakened regions 310a, b and the nattKre and direction of the forces applied to the IOI.. 300 by the ciliary muscle 34 and/or the capsular bag 22, the weakened regions 3I0a, b may additionally or alternatively allow relative linear motion between the between the first intermediate member 308a and the outer support structure 304 in response to the ciliary inuscle 34.
With additional reference to FIG. 21, the outer support structure 304 may further comprise one or more intermediate weakened regions 312 that are cireumferentially disposed between first and/or second intermediate members 308a, b. The intermediate weakened regions 312 rnay be disposed at locations on the outer support structure 304 that will allow the outer support structure 304 to bend, buckle, or otherwise deform in a predetermined and/or desirable manner when the IOL 300 is compress by the capsular bag 22 or is otherwise affected by force produced in response to the ciliaiy muscle 34_ The weakened regions 310a, b and 312 may also be disposed so as to prevent or reduce utiwanted deformation and/or twisting of either the optic 302 and/or the first and second intexxnedia.tem.embers 3{}8a, b.
The weakened regions 310a, b and intermediate weakened regions 312 may comprise various structures and/or material so as to provide a predetermined performance, bending, corxa.pression, and/or motion of the outer support structure 304 and the intermediate m:embers 308a, b in response to the ciliary muscle 34 and/or the capsular bag 22. For exarnple, any of the configurations or arrangements shown in FIGS. 9-16 may be used in conjunction with the TOL 300. Referring to the etn.bodiments illustrated in FIGS. 20 and 21, one or more of the weakened regions 310a, b and 312 may have a radial thickness that is less than a radial thicktiess of the outer support structure in a region proximal the one or more weakened regions 310a, b and 312. Additionally or alternatively, o-ne or more of the weakened regions 310a, b and 312 aTe disposed on a top or bottoin surface of the outer support structure 304 and have a thickness alo-ng the optical axis OA that is less than a thxck-oess along the optical axis OA of the outer support structure 304 in a region proximal the one or more weakened regions 310a, b and 312. Also, one or inore of the weakened regions 310a, b aRid 312 n-iay be disposed along a cornier edge of th.e outer support structui-e 304 similar to the configuration illustrated in FTG. 19. In the illustrated exnbodiments of FIGS. 20 and 21, the weakened regions 310a, b and 312 are disposed along an outer perimete.r of the outer support structure 304; however, some or all of the weakened regions 310a, b and 312 may be disposed along an inner perimeter, a top or bottom surface, or along a corner edge of the outer suppoit structure 304.
Referring to FIG. 22, in certain embodiments, the outer support structure 304 is made of a first material and one or more of the weakened regions 310a, b an:d 312 are anade of a second material that is more bendable than the first material. For example, the first material may be reiatively stiff or hard (e.g., having a relatively high modulus of elasticity or tensile strength), while the second material is a relatively pliable or soft (e.g., having a relatively low modulus of elasticity or tensile strength). In certain embodiments, outer support structure 304 and one or more of the weakened regions 314a, b and 312 are made of the sarrte material or substantially the same material, but the material in the one or more of the weakened regions 310a, b and 312 is processed in a different way from the material in the outer support structure 304. For example, the degree of polymerization may be different in the one or more of the weakened regions 310a, b and 312 than in the outer support structure 304. It will be understood that while the weakened regions 310a, b and 312 are shown as distinct regions in FXG. 22, these regions may be indistinguishable or essentially indistinguishable by visual inspection in an actual IOL. Also, ttie boundary betweer3 the weakexied regions 3.l0a, b an.d 312 and the outer support structure may be extended, gradual, or non-existent_ For example, the boundary inay be defined, in certain einbodiinents, by a gradual transition from the first material to the second material or by a gradual change in the degree of polymerization between the weakened regions 310a, b and 312 than in the outer support structure 304.
Any or all of the weakened regions 310a, b and 312 rnay be configured to form a hinge or to perform the function of a hinge, for example by extending about the optical axis OA by a relatively small circumferential distance, for example less than about 2 mm, preferably less than 1 zxtkxa, arxd more preferably less than 0.5 rn.ixt.
Alternatively, any or all of the weakened regiotis 310a, b and 312 may be configured to form an elongated region in which the weakened regions 310a, b and/or 312 deform by varying amount along the region in response to the ciliary muscle 34 and/or the capsular bag 22. Such an elongate regions is preferably greater than about 2 mm and may be, for example, between about 2 mm to about 3 nnm or between about 3 mm to about 5 mm or even greater than 5 mzn.
Referring again to FIG. 20, for example, the interinediate weakened i-egions 312 rnay be circumferentially disposed equidistant or approximately equidistant between first and the second interrn.ediate mernbers 308a, b. In some embodiments, the outer support structui-e 304 cox-nprises a first arm 314 and a second arm 318 separate and distinct from the first arm, the first arm 314 being connected or coupled to the first wealcened region 308a located near the first intermediate region 308a and second arm 318 being connected or coupled to the first weakened region 308a located near the second intermediate region 308b.
Referring to FIGS. 23 and 24, in certain embodiments, the first and second arms 314, 318 are separate and distinct and the IOL 300 further comprises a void 320 between the first anri 314 and the second arzn 318. Such separation between the first and second arrns 314, 318 z-nay be useful in providing a predetermined performance of the outer support structure 304 a-nd/or the first and second intermediate members 308a, b in response the ciliary muscle 34 and/or the capsular bag 22. For example, referring to FIG. 23, the void 320 between the first and second arms 314, 318 may be configured so that the arms slide toward one another, but do not twist or buckle, as the outer support structure 304 is compressed in response to contraction of the ciliary i-auscle 34. In such embodiments the first and second arms 314, 318 may also rotate relative to the first and second intermediate members 308a, b.
Preferably, the void is sufficiently large that the distal ends of the first and second arms 314, 318 adjacent the voids 320 do not touch when the outer support structure is in its most compressed configuration within the eye.
Referring to FI.G. 24, at least a portion of the first arm 314 may be slidably disposed to at least a portion of the second arm 318. For example, the first and second anxzs 314, 3 18 may be configured to press against one another at their distal end and to slide as the capsular bag 22 changes shape during accoznmodatiort. Alternatively, the d.istal ends of the first and second arms 314, 318 may be kept in close contact with one another by using clamp or other appropriate device (not shown) for maintaining the distat end in contact with one another as the outer support structure is cotnpressed and/or expanded during accommodation. In some embodiments, the first and second arms 314, 318 is configured so that the distal ends are in close proximity to one anotber, but are not necessarily or always in contact with one another as the outer support structure 304 is compress and/or expanded.
Refexring to FIG. 25, the IC}I.. 300 may comprise a third intei-mediate member extending between and connecting the optic 302 and the outer support structure 304.
Additionally or alternatively, the outer support member may be configured to be circular, as illustrated in FIG. 25, rather that oval shaped, as illustrated in FIGS. 20-24. In the illustrated embodiment shown in FIG. 25, the'IOL 300 may further comprise the intermediate weakened regions 310 shown in FIGS. 20-22 (not shown). Also, the weakened regions 310a, b and/or 312 for the embodiment illustrated in FIG. 25 may have any of ti-iE structures or configurations discussed with regard to the embodiments discussed for FIGS. 20-24, where appropriate.
Referrin.g again to FIG. 20, the intraocular leiis 300 may comprise the optic 302 and the outer support structure 304, wli.erein the outer support structure 304 completely surrounds or encircles the optic 302 and the intermediate inembers 308. In sucla embodiments, the intermediate rnembet's 308 exteild between and couple or connect the optic 302 and the outer suppo-rt structu7re 304. Also, the outer support structure 304 coix-prises a first weakened region 310a disposed pxoxirnal the first interrrzediate member 308a and a second weakened region 310b disposed proximal the first intermediate rneniber 308a. Tl--e first and second weakened reglons 310a, b are configured to allow angular motion between the first intermediate mexnber 308a and the outer support structure 304 in response to the ciliary muscle 34 of the eye.
The configuration, number and location of the weakened areas or portions or of the hinges in each of the illustrated embodiments are intended xncrely to be illustrative and, in.
pr.actice, will depend on various factors such as the number and configuration of the intermediate members, the materials used, and the mode of deformation desired.
Furtherznore, the outer support structures and outer rings and intermediate tnennbers in the IOLs of the embodi;nents in each of the FIGS. 1-25 are not intended to be limited to use with optics of any particular structui-e or type of material. For instance, the optics may be forxned of rigid biocompatible materials such as polyxxzethyl methacrylate (PMMA) or deforrnable materials such as silicone polymeric xnaterials, acrylic polymeric materials, hydrogel polymeric materials, and the like. In addition, the optic bodies may be either refractive or diffractive.
In the most preferred embodirnents, the optic body has a diameter in the range of about 3.5 to about 7 xnm a-nd, optimally, in the range: of about 5 mm to about 6 mm. The overall diaineter of the IOL, including the intermediate members and outer ring in unstressed conditions, is prefe:rably about 8 mm to about 13 mm. Additionally, the optic has a far-vision correction power for infinity in an unaccoYnrnodated state.
A series of tests were run on a prototype IOL in order to evaluate the perfornaance of the IOL under compression. The prototype IOL had the canfiguration of IOL 120' shown in FIG. l8A and was foi-rned entirely of a unitary, reinforced cross-linked silicone polyrneric material of the type described in Christ U.S. Pat. Nos. 5,236,970, 5,376,694, 5,494,946, 5,661,195, 5,869,549, and 6,277,147. The disclosures of each of these U.S.
patents are inco;po-rated in their entirety herein by reference.

During the tests, it was observed that, wlien the IOL 120' was compressed an ainount in the range of about 0.3 mm to about 1 nixn, the image quality in the far zone 132 iknproved slightly, while the image quality in the near zone (add power=2D), decreased slightly.
Referring to FIGS. 26 and 27, in certain embodiments, an equiconvex optic 304 comprises surfaces 306, 308. Those of skill in the art will recognize that the optic 304 nnay be characterized by a focal length f(e.g., f, in FTG. 26 and f2 in FIG. 27) produced as light 310 is refracted by tl-ie surfaces 306, 308, It will also be recognized by those of skill in the ait that the diopter power D of the equiconvex optic 304 is equal to 1/f, when f is in units of meters. For isotropic coznpression (e.g., cLt, tL> in FIGS. 26 and 27, respectively) or deforniation (e.g., deformation of the surfaces 306, 308 illustrated in FIGS.
26 and 27) of the equiconvex optic 304, there exists a relationship between the amount of diarnetric compression .d (i_e. decrease in refractive zone size; for example d, - d2) and the increase in diopter power (for example D2 - D 1). With an increase in diopter power (e.g., from Dl to D2), at least some improvement in near vision can be expected. Referring again to FIG. 18A, by coznbini.ng the increased diopter power obtained through deformation of the optic 126' with that obtained through axial movement, it is believed that enhanced accoansnodation can be achieved. In other words, a patient's presbyopia can be effectively reduced. Still better accommodation, or further redttction of presbyopia, can be obtained from the add power in the near zone 134 of a multifocal optic 126', or from the maximum add power of an aspheric optic.
Although the aforeznentioned tests were performed on an IO>:.. 120' foraxzed of a reinforced cross-linked silicone polymeric rrjaterlal, the principles of the invention will apply equally well to accommodating IOLs fonned of any ophthalmically acceptable, deformable material or cornbination of mateiials. For instance, one or more of the optic 126', intermediate members 122', and outer ring 124' may be formed of an acrylic polymeric niaterial. Particularly useful inaterials and combinations of materials are disclosed in U.S.
patent application Ser. No_ 10/314,069, filed Dec. 5, 2002.
Furthermore, while each of the accommodation assemblies illustrated 1-erein compi-ises an outer ring surrounding and spaced fiko:rn the optic with voids therebetween, and a plurality of intez-mediate members extending bctween and connectinb the optic and the outer ring, these assemblies are merely exemplary. Other assembly configurations capable of effecting both axial movement and accommodating deformation of the optic are also included within the scope of the invention. For instance, accommodation and/or force txansfer assemblies of the type shown in the aforementioned co-pending, commonly assigned U.S.
patent application Ser. Nos. 09/656,661, 09/657,251, and 09/657,325, may also be suitable.
Whi1e the present invention has been described with respect to various specific examples and embodiments, it is to be understood that the invention is not timited thereto and that it can be variously practiced within the scope of the following claims.

Claims

WHAT IS CLAIMED IS:

I. An intraocular lens for insertion into the capsular bag of an eye, comprising:
an optic having a periphery and centered about an optical axis;
an outer periphery configured to engage an equatorial region of the capsular bag of an eye;
an outer support structure disposed along the outer periphery of the intraocular lens and spaced from the optic with voids therebetween;
a first intermediate member operably coupled to the optic and the outer support structure; and first and second weakened regions disposed along the outer periphery, each of the weakened regions disposed between the outer support structure and the first intermediate member, the weakened regions configured to allow relative motion between the outer support structure and the first intermediate member in response to the ciliary muscle of the eye.
2. The intraocular lens of claim 1, wherein the outer periphery is circular.
3. The intraocular lens of claim 1, wherein the outer periphery is elliptical.
4. The intraocular lens of claim I, further comprising a second intermediate member extending between and operably coupling the optic and the outer support structure.
5. The intraocular lens of claim 4, further comprising a third intermediate member extending between and connecting the optic and the outer support structure.
6. The intraocular lens of claim 1, wherein the outer support structure further comprises at least one intermediate weakened region circumferentially disposed between first intermediate member and the second intermediate member.
7. The intraocular lens of claim 6, wherein the at least one intermediate weakened region is circumferentially disposed equidistant between first intermediate member and the second intermediate member.
8. The intraocular lens of claim 1, wherein at least one of the weakened regions comprises a hinge.
9. The intraocular lens of claim 1, wherein at least one of the weakened regions has a radial thickness that is less than a radial thickness of the outer support structure in a region proximal the at least one weakened region.
10. The intraocular lens of claim 1, wherein at least one of the weakened regions has a thickness along the optical axis that is less than a thickness along the optical axis of the outer support structure in a region proximal the at least one weakened region.
11. The intraocular lens of claim 1, wherein the outer support structure is made of a first material and at least one of the weakened regions is made of a second material that is more bendable than the first material.
12. The intraocular lens of claim 1, wherein the outer support structure comprises a first arm and the second arm with a void therebetween.
13. The intraocular lens of claim 12, wherein at least a portion of the first arm is slidably disposed to at least a portion of the second arm.
14. An intraocular lens for insertion into the capsular bag of an eye, comprising:
an optic having a periphery and centered about an optical axis;
an outer support structure having an outer periphery, the outer support structure entirely and continuously surrounding the optic and spaced therefrom with voids therebetween, the outer support structure configured to engage an equatorial region of the capsular bag of an eye; and a first intermediate member extending between and operably coupled to the optic and the outer support structure;
a weakened region disposed proximal to the first intermediate member along the outer periphery, the weakened region configured to allow relative motion between the outer support structure and the first intermediate member in response to the ciliary muscle of the eye.
15. The intraocular lens of claim 14, wherein the outer support periphery is elliptical.
16. The intraocular lens of claim 14, further comprising a second intermediate member extending between and operably coupling the optic and the outer support structure.
17. The intraocular lens of claim 16, further comprising first weakened regions disposed along the outer periphery proximal the intermediate members, and also comprising second weakened regions disposed along the outer periphery proximal the intermediate members, the first weakened regions and the second weakened regions configured to allow angular motion between the outer support structure and the intermediate members in response to the ciliary muscle of the eye.
18. The intraocular lens of claim 17, wherein the outer support structure further comprises at least one intermediate weakened region circumferentially disposed between first intermediate member and the second intermediate member.
19. The intraocular lens of claim 18, wherein the at least one intermediate weakened region is circumferentially disposed equidistant between first intermediate member and the second intermediate member.
20. The intraocular lens of claim 17, wherein at least one of the weakened regions comprises a hinge.
21. The intraocular lens of claim 17, wherein at least one of the weakened regions has a radial thickness that is less than a radial thickness of the outer support structure in a region proximal the at least one weakened region.
22. The intraocular lens of claim 17, wherein the outer support structure is made of a first material and at least one of the weakened regions is made of a second material that is more bendable than the first material.