FR2589352A1 - INTRAOCULAR LENS HAVING NON-GLARE EDGES AND MANUFACTURING METHOD THEREOF - Google Patents

Abstract

AN INTRAOCULAR LENS WITH A COLORED OR NON-GLARE PERIPHERAL EDGE (ANTI-REFLECTED) TO PREVENT DIFFUSED AND REFLECTED LIGHT FROM PRODUCING A BLIND OR SECONDARY IMAGES. A STRIP 45 IS FORMED ON THE PERIPHERY OF THE LENS BODY 42 AND IS PREFERABLY COLORED (TINTED) SO AS TO NOT TRANSMIT LIGHT. HAPTIC ELEMENTS 48, 50 ARE ALSO COLORED TO HELP THE VISUALIZATION OF THE LENS DURING A SURGICAL OPERATION. THE LENS IS PREFERABLY MADE OF A SINGLE PIECE OF MATERIAL, ALTHOUGH IT MAY INCLUDE SEVERAL PARTS. LOCATION HOLES 70 HOUSEHOLDS IN THE LENS BODY ARE IDENTICALLY PROTECTED WITH NON-GLARE MATERIAL.

Description

1.

  The present invention relates to intra-

  eyepieces and, more particularly, lenses having a non-glare surface (anti-reflection) on their periphery in order to prevent their edge from diffusing or reflecting light causing streaks or secondary images.

  In the human eye, the lens is located at the back.

  of the pupil and iris, and has the function of focali-

  ser the light passing through the cornea and the pupil on the retina

  at the back of the eye. The lens is a bi-con- structure

  vex highly, transparent, made up of ectoder- cells

  mics surrounded by a thin capsule. The crystal capsule

  flax is supported at its periphery by ligaments, called zonules, which pursue the ciliary muscle. The contraction and dilation of this muscle relax and tighten the zonules, changing the shape of the lens and therefore changing

focal length.

  A cataract condition occurs when the material

  re located inside the capsule of the lens veils, thus obstructing the passage of light. To correct this condition, there are two forms of surgery: intracapsular surgery 2.

  and extracapsular surgery. In intracap-

  cataract sular, the entire lens is removed while intact. To achieve this, the surgeon cuts the suspension zonules or ligaments over the entire periphery of the capsule and removes the lens with the cap.

  the and its contents intact.

  In extracapsular removal of cataracts, an incision is made in the front wall of the membrane ("anterior capsule") of the lens, and the material is removed

  cell veiled through this opening.

  Various techniques are used to carry out this removal.

  scratching, aspiration or phageomulsification. The transparent wall of the membrane of the rear capsule ("posterior capsule") remains in place in the eye. The zonules and the peripheral parts of the anterior capsule also remain in place.

  Intraocular lenses are used to replace

  cer the lens after surgery either ex-

  tracapsular or intracapsular. After implantation, the intraocular lenses serve as means of optical correction

of the eye.

  Prior art intraocular lenses

  quent many designs that are based on various pro-

  the fixation and stabilization of the implant inside the eye so that the central or intermediate body of the lens is kept in a stable position relative to

  the pupil and the line of vision of the eye. Intra-

  There are generally three types of eyepieces: those placed in the interior chamber, that is to say between

  iris and cornea, those that are in the posterior chamber

  superior, that is to say at the back of the iris and those that are

  directly supported by the iris. We use conventional-

  These three types of lenses, the choice being partly dictated

  ted by the patient's condition and in part by the preferences of the

doctor inserting the lens.

  Intraocular lenses normally include 3. an optical element with two or three haptic elements

  which generally extend radially from the element

  optically and contain foot parts which sit

  normally be in the sclera spur for a lens

  the inner and either in the ciliary groove or the inner

  laughing of the lens capsule for a posterior lens

  re. For lenses supported by the iris, the hap-

  ticks are in contact with the iris and keep the optical element centered in the pupil. The optical element normally includes a transparent circular optical lens with a diameter of about 6 mm. The haptic elements in most of the lenses are strands or filaments

  hoses having one end fixed to the lens and comprising

  as a second part moving away radially from the lens to form the seat. Several haptic designs are commonly used; for example, a pair of U-shaped loops in which the two ends of each loop are connected to the lens, and J-shaped loops in which only one end of the loop is fixed

to the lens.

  More recently, other forms of intraocular lenses have been developed, either for the anterior chamber, or for the posterior chamber, or for both. Some of these lenses are described in the following United States patents No. 4,174,543, No. 4,328,595, No. 4,412,359, No. 4,418,431, No. 4,426,741, No. 4,435,855, No. 4,437 194, no.4 441 217, no 4 480 340, no 4 502 162, no 4 502 163,

  n 4,503,570, n 4,504,981 and n 31,626 (Reissue).

  The models and types of intraocular lenses that are commonly encountered are those which generally consist of a single solid piece of material, or generally of two or three pieces, often formed of types of materials.

  different. In multi-piece lenses, the optic body

  that central is typically made of polymethyl methacrylate (PIMMA), while the peripheral fixing parts are 4. of different material such as polypropylene (prolene), these

  materials being joined mechanically to the central optical body.

  It is often common to form a multitude of small holes, grooves or indentations on the outer periphery of the lens body to assist the surgeon in the im-

  planting and positioning of the lens in the eye.

  All intraocular lenses suffer from a significant defect. They reflect or refract part of the incoming light in such a way that secondary images, streaks of light or other reflections are created

  for the person wearing them. These images and streaks are annoying

  its and reduce the optical qualities of the lens.

  Stray light rays are mainly due to the edges of the circular body of the lens, although often they are also caused by the inner edges of the haptic elements (where they are linked to the body of the lens

  or inserted into it), as well as the grooves or holes

  location. The edges of the lenses are subjected to an operation

  finishing to give them a rounded shape (in order to obtain a smooth, non-irritating external surface) and, consequently, the edges can reflect and refract the

  light at virtually any angle and any-

  direction in the eye and on the retina. The holes in the edges and the ends of the haptic elements also create obstacles for the uniform passage of light and can

  also cause reflection and refraction of light rays

  in various directions and cause various forms of "ima-

"undesirable" secondary ages.

  Problems with streaking and secondary imaging can also be caused by one of the following three types of intraocular lenses: posterior chamber,

  anterior chamber, or lens supported by the iris. The problem

  me is most acute when the intraocular lens is decent

  trée at the start in its positioning or moves later

  to take a slightly off-center position in the eye. This can result in an edge of the body

  of the lens, one or more of the positioning grooves

  or one end of a haptic element is found

in the line of sight.

  The problem is also acute in situations

  dim light in which the pupil of the eye dilates

  te to take approximately equal dimensions or

  larger than the diameter of the lens body. For this reason

  her, people wearing intraocular lenses have difficulty when driving overnight or

when the light is dim.

  By their nature, intraocular lenses are small and transparent and surgeons often have difficulty seeing and handling them. The body of

  the lens itself is typically only in the range of 5 to 7 mil-

  diameter limiters and the current overall length of the len-

  Typical intraocular nails are only about 12-14 millimeters. Intraocular lenses are made up

  highly transparent material (e.g. poly-

  methyl methacrylate), so as to ensure good

  optical properties after insertion. Similarly, the in-place fasteners (or haptics) are typically made of a relatively clear material (for example, polypropylene or polymethyl methacrylate) so that the implants are not easily visible

  from the outside, especially when the lens is in use

located in the anterior chamber.

  Clear, small intraocular lenses raise the most visibility problems

  important during their implantation in the post-

  better. The surgeon sometimes has difficulty seeing them and therefore determining the precise location of the ends of the loops when the lens is partially inserted in the eye. Some multi-piece lenses today have haptic loops of a different color 6.

  of the optical part, which partially solves the problem.

  However, to date it has not been practical to make a one-piece lens with a clear body for

  the lens and colored haptic elements.

  It would be desirable to have an intraocular lens which makes it possible to reduce or eliminate lateral reflections during its use by the patient, and which is more visible to the surgeon during his

  One of the main ob-

  jets of the present invention is to obtain an intra-

  eyepiece for both the anterior chamber and the chamber

  which meets these objectives.

  Another subject of the present invention is a lens.

  the one-piece intraocular which has a clear optical part (body of the lens) and colored haptic elements

or not clear.

  The present invention also relates to a lens.

  the intraocular with a strip of light absorbing material

  re on its periphery so as to avoid that light

  diffused / reflected rasite is produced by the edge of the lens. The intraocular lens must also prevent stray light from being produced by the positioning apertures and the connections between the haptic loops and

the body of the lens.

  The present invention also relates to a lens.

  the intraocular which satisfies the objectives set out above

  which can be made and used easily

and economically.

  The intraocular lens of the present invention has

  was designed to overcome the problems raised by the len-

  intraocular lenses of the prior art and satisfy the

  objects just mentioned. The present invention can be used

  tion for intraocular lenses having virtually all

  your shapes and dimensions and with virtually all types or styles of haptic elements. It can also 7.

  be used in the case of lenses implanted in the chamber

  bre anterior, in the posterior chamber or fixed in the

plane of the iris.

  According to a preferred embodiment of the present invention, the intraocular lens comprises a body with a strip of optically different material, such as a light absorbing or anti-reflection material, on its periphery. The strip is wide enough in the radial direction to cause

  the rounding and regularity of the edge that is encountered

  particularly in the field of intraocular lenses in a way

  re to avoid damaging the tissues with rough edges

  his or cutting. The strip can be made of the same material

  laugh as the rest of the lens with the addition of a dye

  so as to absorb most or all of the lu-

  mother crossing it. The lens and the strip can be

  formed from a single piece of material, with a clear central optical part and a colored external part. The haptic loops of the intraocular lens can be performed in any of the various configurations and shapes

  that are known in the art, and are also preferably colo-

  dyes with a dye or other means. The haptic elements can be made of the same material as the lens body or of a different material, and are fixed to the body

  of the lens using any conventional manner

than.

  The anti-reflection tape can also be made

  of a plastic material different from that of the opti-

  that central, the two materials having absorbing properties

  different coloring, different coloring, properties of

  different transparency and / or different refractive indices

  famous. Similarly, the peripheral edge of the lens may be attacked or otherwise bevelled after manufacture to provide a non-corrosive surface.

  dazzling or non-reflective.

  In another embodiment of the invention, 8. a one-piece intraocular lens is provided with a

  colored band on its peripheral edge and hapti- loops

  ques corresponding colored integrals. The lens is molded in one piece, essentially according to its final shape, then is finished or smoothed. Alternatively, the lens can be made

  in its final form from an imprint of colored material

  d with a clear circular central part serving as an

optically.

  In yet another embodiment of the invention

  tion the colored or light absorbing material is present in certain parts of the lens so as to cover the locations of the positioning and fixing holes of the

haptic curls.

  The present invention will be well understood during the

  following description made in conjunction with the attached drawings

  in which: Figure 1 is a sectional view of a normal eye;

  Figure 2 is a sectional view of an eye after chi-

  extracapsular cataract rurgy and with a lens

  traocular for posterior chamber set up; Figures 3-5 and 910 illustrate various modes of

  production of intraocular lenses according to the present invention

tion; and

  Figures 6-8 illustrate a pre-

  for the manufacture of the lens of this invention

tion.

  Figure 1 illustrates a normal eye that has been represented

  felt in outline by the reference 10. We have omitted to simplify the parts of the pupil structure

  that are not considered essential for understanding

sion of the invention.

  The cornea 12 is on the outside of the struc-

  pupil ture. Cornea 12 is a clear, transparent tissue

  rent which acts as a light transmitting element. The cornea also has a certain ability to focus light 9. on the retina (not shown) at the back of the eye. The light transmitted by the cornea passes through an anterior chamber 14 and the glass it contains and falls on the

  lens 16. The lens acts as the main element of fo-

  calibration on the retina for the penetrating light. The window 18 fills the chamber at the rear of the lens 16. The lens 16 is enclosed in a capsule 20 comprising a front membrane 22 and a rear membrane 24. The front membrane 22 is generally called "anterior capsule", the membrane

rear 24 "posterior capsule".

  The iris 26 is placed between the cornea 12 and the crystal-

  flax 16 and acts as a diaphragm to regulate the amount of lu-

  light falling on the lens. The central opening of the iris 26 is the pupil 28. The lens 16 is placed in the posterior chamber 30 of the eye. The anterior chamber is the part located at the front of the iris (between the cornea and the iris)

  and the posterior chamber is the rear part of the iris.

  The cornea and the iris meet at the outer edge of the iris forming a groove or "angle" 32. The angle 32 extends over the

  perimeter of the iris and constitutes the place where the major

  tie of the intraocular lens for anterior chamber is

located and fixed in place.

  As indicated earlier, in the case of cataracts, veiled areas form in the lens 16. These veiled areas affect the transmission of light and interfere with vision. When the veil becomes sufficiently serious, the only possible treatment is the surgical removal of the lens,

  either by extracapsular surgery or by intra-

  capsular. An intraocular artificial insert for the eye 10

  has, in broad outline, the reference 40 in FIG. 2.

  The insert 40 is shown as implanted in the pos-

  of the eye after intracapsular surgery. Insert 40

  can be made of any suitable material compared

  tible with the environment of the eye, for example of a non-toxic plastic material, namely polymethyl methacrylate,

polypropylene or silicone.

  As previously indicated, the present invention

  tion also relates to intraocular lenses which are implanted

  ted in the anterior chamber or supported by the iris. These are not shown in the figures, but the man

  will easily understand how the pre-

  feels -invention-concerns- such types of lenses and can

use them. -

  The insert 40 comprises an intermediate body 42, fo-

  beaconing light, which has an anterior surface con-

  vex or flat 44 and a posterior convex or flat surface 46.

  A pair of opposing fasteners in position, or ele

  haptic loop elements, 48 and 50, extend from

  opposite peripheral parts of the body 42. When a lens

  the intraocular is placed in the anterior chamber 14 of the eye, the outer ends of the elements 48 and 50 are mounted in the angle 32. When an intraocular lens

  is placed in the posterior chamber of the eye, as shown

  felt in Figure 2, the outer ends of the fixing elements are seated in the part of the spur 51 of the ciliary body. Fasteners in position can be made of any material that is not toxic to the eye

  and also compatible with the material of the body of the

  tille, for example polypropylene (prolene). However,

  lon the present invention, the haptic elements are preferably made of the same material as the body of the

  lens, namely polymethyl methacrylate. The ele-

  haptic elements can be formed from monofilament strands

  hot-setting material to take the configuration

  desired shape and shape, or can be molded or machined

directly in the precise form.

  A preferred embodiment of the present invention

  vention is represented in figure 3. The optical part

O89352

  11. Clear 42 of the intraocular lens has a periphery or strip portion 45 on its perimeter to avoid stray or reflected stray light which is produced by the edge of the lens. The strip 45 is preferably made of the same material as the optical part 42, except that a dye has been added so as to modify the color and to it

  absorb the light. The preferred color is

  their blue, because it is accepted in haptic elements

  for posterior chamber lenses. However, we understand

  O10 dra that any dye can be used and that it is possible to provide a series of lenses with strips of

  various colors so as to adapt them to the actual color-

  the eyes of people receiving the implant.

  The haptic elements 48 and 50 are also colo-

  res to be matched to the color of the strip 45. In fact, in a one-piece lens such as that shown in FIG. 3, the haptic elements are formed at the same time as

  the body of the lens and are in one piece with it.

  The one-piece assembly can be injection molded or

  casting in the desired final shape (and smoothed in opera-

  minor finishing operations), or else the assembly can be machined from a larger block of material having a

  clear optical part at its center.

  In the intraocular lens illustrated in FIG. 3, the fixing elements in position are represented as having the shape of a J similar to the so-called "Shearing" types and

  "Simcoe" of posterior chamber intraocular lenses.

  Such structures have been used simply by way of illustration and it will be understood that any size, style, shape or configuration of the fasteners in position can be used in the present invention. Furthermore, as indicated previously, the present invention can be used with lenses for anterior chamber or lenses for posterior chamber and therefore haptic elements and elements 12 of different positioning will be commonly used for the different types of lenses. In this regard, there may be two, three, four or more fasteners on the periphery of the body of the

  lens. In addition, the fastening elements of each lens

  may be the same or some may be different

  rents, and they can be strands of formed or soft material

  in the desired position, or else they can present themselves

  in the form of flat, massive discs, or ma-

  material. O10 In the configuration shown in Figure 3, the

  haptic elements 48 and 50 are fully connected to the ban-

  45 and therefore to the body 42 of the lens in two tangential locations 60 located on the opposite sides

  of the lens body. Rounded intersections 62 allow

  are trying to get a smooth transition from band to element

  haptically and form a stronger joint. The ends 52 of the haptic elements are curved backwards in

  the direction of the edge of the lens so as not to eoDr-

  expensive eye tissue during insertion and implantation

of the intraocular lens.

  When the strip 45 is formed on the body of the lens, it is given a sufficiently large width in

* the radial direction so that it still understands

  the periphery of the edge after typical operations

  edge rounding and smoothing. These operations are

  to prevent the fabric from being damaged by sharp edges

  beggar or tapered. The strip 45 is preferably made up

  of the same material as the clear optical portion 42 of the lens

  intraocular lens with the addition of a blue dye which absorbs most of the light passing through it. So any light that falls on the lens strip will be

  absorbed instead of being transmitted. This prevents this light from

  re does not cause streaks or secondary images as a result

  of refraction due to the rounded edges of the lens.

  Similarly, the light that enters the lens through the clear part (and which otherwise 13.

  would fall on the rounded edge and cause se-

  condaires) will pass directly from the clear plastic part to the absorbent plastic strip without change of direction to

  interface and will be absorbed by the tinted plastic material.

  Thus, the colored periphery or strip portion 45 will reduce the

  reflections (glare) caused by the reflection of light

  re on peripheral (or edge) and / or other surfaces

structures and devices.

  The colored haptic strip and elements facilitate-

  will also visualize the lens and its position during insertion and implantation by the surgeon. This will reduce the risk of complications that may occur during surgery and implantation

  of the lens in an off-center position.

  The same effect of light absorption or non

  glare can be obtained by providing a different type of glare

  material or surface on the periphery of the lens body

  the. For example, a colored strip can be painted or applied

  located at the edges of the lens body after its formation, its

  rounding and smoothing. Similarly, an over-

  non-reflective side could be obtained by attack or forcing

  moved mechanically on the surface of the peripheral edge of the body

  of the lens, insofar as this surface remains sufficient

  that the material is compatible with the internal fluids and the tissues of the eye. In the broadest sense,

  anything that could limit the transmission of visible light

  ble could be fixed, embedded or constitute part of the edge

  lens body device.

  It is typical to provide one or more holes,

  positioning or indentations on the intra-lens

  eyepiece so that it can be manipulated, implanted and posi-

  easier for the surgeon. A pair of positioning holes 70 is shown in Figure 3. The positioning holes are located on the outer periphery of the lens body so that they will not lie on the person's optical path or line of vision. wearing the lens. In order to minimize or avoid secondary images and streaks of stray light due to

  positioning holes, the 72 body parts of the

  tille around the holes 70 are made of the same material

than edge 45.

  A preferred device for manufacturing a

  intraocular tille in one piece, with an edge and elements

  anti-reflective haptic elements is shown in Figures 6 and To make the two-color embodiment of this

  invention as shown in FIG. 3,

  we manufacture or procure a cylindrical rod 74 of polymetha-

  clear methyl crylate. The rod has a diameter of 5-6 mm and will constitute the central optical part 42 of the lens

  when it is finished. The rod is placed in a mold 76 in-

  turned along its length by polymethyl methacrylate

  blue color 78, preferably in crystalline or pon-

  derail. The conventional mold is then heated so as to melt the colored polymethyl methacrylate on the

  clear polymethyl methacrylate rod. In addition, one can use

  be a conventional degassing means, for example a vacuum or suction mechanism, to ensure that all bubbles and possible voids of the material are eliminated during

casting process.

  It will also be understood that other processes can be used to make lenses in two colors.

  and classic techniques for manufacturing plastic materials

  ques. For example, the lenses could be made by injection molding the blue material around

  a rod or piece of clear material.

  At the end of the casting or molding operation, thin slices 80 are cut from the two-color material with the clear optical part in the center. For one-piece lenses, the slice will have a dimension greater than 12-14 mm in one direction and 6 mm in the other. The rectangular section of material in two colors is then given the shape

  final of the lens (shown in phantom in fi-

  gure 7) using precision filming techniques

  if we. We then use the finishing and polishing processes.

  wise classics. The positioning holes 70 are drilled in

  the body of the lens with a precision drill. When-

  that the one-piece lens is finished, it will look like the embodiment shown in Figure 3, with a thin strip or periphery 45 of colored material surrounding the part

optics 42.

  The bands 72 are formed around the position holes-

  ment by providing grooves or channels 82 along the outer edge of the cylindrical rod 74 before its insertion into the colored material. This is shown in Figure 8. When

  the final material of the lens is cast or molded, the grooves

  res or channels are filled with colored material. The material filling the grooves 82 forms the colored zones 72 of the final lens. When drilling the positioning holes in the lens 40, this operation is done inside

colored areas 72.

  Figures 4 and 5 illustrate other embodiments.

  sation of the present invention. When the characteristics and parts are the same as those just described above in connection with Figure 3, they bear the

  same reference number with "'" (figure 4) or "" (figu-

re 5).

  FIG. 4 describes a one-piece intraocular lens 40 ′ comprising a clear body 42 ′ and colored (tinted) haptic elements 48 ′ and 50 ′. The 40 'lens can

  be molded or formed in one piece in the same manner as above

  above in conjunction with Figures 3 and 6-8. However, when

  that the body 42 ′ of the lens is machined, all of the material

  blue or colored material surrounding the periphery of the body is

  lifted. As shown in FIG. 4, the colored zones 72 ′ intended for the positioning holes can remain so as to minimize or avoid the secondary images due to the

70 'holes.

  16. In FIG. 5, the lens 40 "comprises three parts

  manufactured separately, which are combined to form the lens

  the final intraocular. The 42 "lens body has

  te a clear central part and a 45 "peripheral strip which contains a dye or other light absorbing material. The 45" strip is made of the same plastic material

  than the optical part but with the addition of a dye.

  The lens body imprint is formed in a di-

  meter and a thickness greater than the desired dimensions and

  machined to its final shape and size.

  The two haptic elements 48 "and 50" have strands or filaments of material which are flexible and have

  "memory" so that you can arch your body when applying

  cation of forces while being able to return to their original form when the forces are removed. Each of the haptic elements is a monofilament strand of a polymeric material such as polypropylene (prolene), polymethyl methacrylate, etc. The haptic elements are permanently attached to the body of the lens by gluing, heat punching, etc. and preferably are inserted in small holes made in

  the periphery of the lens body.

  The 48 "and 50" haptic elements are tinted or

  colored with the same shade as the 45 "strip part.

  makes it easier to visualize their position during

  surgical operations and post-operative examinations.

  In yet another embodiment of the pre-

  invention (Figure 9), it is possible to manufacture separate

  rement a colored ring (or a ring made of a non-dazzling or absorbent material) and fix it on the periphery

  of a clear lens body. For example, a lens body

  the 86 could be inserted in a ring 84 made separately

  is lying. The haptic elements 88 can either be formed in one piece with part of the ring 84, or be fixed to

  this ring as separate filaments.

  As another embodiment of the present invention, it is possible to use a silicone material.

  for all or part of the intraocular lens.

  It is possible to mold or pour a silicone ring on the periphery of a lens body, the silicone being colored or otherwise designed to provide consistency.

  anti-reflection or light absorbing truction. It is also

  ment possible to make the separate ring 84 of Figure 9

  silicone and insert the lens body into it. The year-

  neau could include, in one piece with it, a support and centering means, or these could be manufactured

separately and attached to the ring.

  If necessary, the lens body as well as the ring (molded, cast or separate ring) could be made of silicone. With such an embodiment, the body of the lens would preferably be made of a silicone more

as rigid as the peripheral ring.

  When you want to include a rib for inter-

  vention by laser on the intraocular lens, the rib is

  ra preferably made of colored or absorbent material

  light to minimize or avoid glare

  ment that it provokes. Figure 10 shows a side view

  pe of a lens body 90 with a rib 92. The rib serves on posterior chamber lenses to space the posterior capsule from the rear surface 94 of the lens

  so as to allow the subsequent dissection of this cap-

  posterior sule by a yttrium-aluminum garnet laser. The rib is typically a raised annular rib

  which is provided on the rear periphery of the body of the

  tille. According to the present invention, the edge of the body 90 of the lens and the rib 92 both consist of a

  96 colored or light absorbing material.

  The intraocular lenses according to the present invention

  tion can be inserted into the eyeball, either in the anterior chamber or in the posterior chamber, using conventional medical techniques. These techniques 18. involve the introduction of the lens structure

  into the desired room through a cor- rect incision

  neo-sclerotic which is also used to remove - the crystal -

linen 16.

  Although the present invention has just been described in detail in the case of intraocular lenses for

  posterior chamber, we will understand that we can also

  bend with any type of intraocular lens, whether or not implanted in the anterior chamber, in the posterior chamber, or whether it is supported by or located on the iris. With any of the three types of lenses, it is always possible to implant it in the

  slightly off-center or slightly off-center

  in its harbor. In addition, in post-chamber lenses

  The present invention has particular use in cases where the level of light is low, the pupil of the eye then being totally or substantially dilated. In such cases, the diameter of the pupil is often greater than that

  of the body of the implanted lens, and it is more possible

  ble for the light to come strike or cross the edge

  lens body device.

  In the anterior chamber lenses and the

  most of the lenses in the plane of the iris, the lumi-

  re reaches the intraocular lens in all directions and is frequently diffused or reflected by the edge of the lens body located just in front of the pupil. The rounded edges of the lens can

  cause parasitic or secondary images due to

  fraction unless a strip of absorbent material is

  located on the periphery of the lens.

  The present invention is not limited to the examples

  ples of realization which have just been described, it is on the contrary susceptible of modifications and variants

  which will appear to those skilled in the art.

19.

Claims (36)

  1 - Intraocular lens for implantation in the eye, characterized in that it comprises:   - a body (42; 42 '; 42 ") having an edge.   risk, - means for fixing in position (48, 50, 48 ', 58'; 48 ", 58") attached to the lens body to position and center the body in the eye, and - anti-reflection means (45; 45 '; 45 ") on the edge   peripheral io of the lens body.   2 - Intraocular lens according to claim 1, characterized in that the lens body and the fixing means in position form a single piece of the same material. 3 - Intraocular lens according to claim 1, characterized in that the means for fixing in position consist of two haptic elements {48, 50; 48 '"50'; 48", 50 ") and these elements are manufactured separately from the body   of the lens and fixed to it.   4 - Intraocular lens according to claim 1, characterized in that the anti-reflection means comprises a   strip of colored material (45; 451; 45 ").   - Intraocular lens according to claim 4, characterized in that the strip of colored material is formed by dyeing part of the material constituting the body of The lens.   6 - Intraocular lens according to claim 1, characterized in that it further comprises at least one means   anti-reflective positioning on the lens body.   7 - Intraocular lens according to claim 6, characterized in that the anti-reflection positioning means comprises an area of non-dazzling material on the body   of the lens, an opening being formed therein.   8 - Intraocular lens according to claim 1,   characterized in that it further comprises a means of   height rod (96) on the lens body to space the face 20.   back of the lens body of the posterior capsule when   that this intraocular lens is implanted in the posterior chamber of the eye, this spacing means being constituted anti-reflective material.   9 - Intraocular lens according to any one   of the preceding claims, characterized in that it comprises:   - a body (42; 42 '; 42 "); - at least two fixing elements in position (48, 50; 48', 50 '; 48", 50 ") for positioning and centering the body of the lens in the eye, - the lens body and the fixing means in position being made in one piece with the same material, and - the fixing means in position having a color different from that of the body.   - Intraocular lens according to claim 9, characterized in that the body of the lens is clear, the fixing means in position are blue, and the body of the   lens as well as the fixing elements are made of polymetha- methyl crylate.   11 - Intraocular lens according to claim 9, characterized in that it comprises in addition to at least one positioning means on the body of the lens, and in that   that the surface on which the positioning means is located   consists of the same colored material as the elements fixing in position.   12 - Intraocular lens for implantation in the eye, characterized in that it comprises: - a body (86), - a ring means (84) fixed to the periphery of the body, this ring being made of a material which absorbs more light than the body of the lens, and - position fixing means (88) joined to the ring to position and center the body of the lens in the eye.   13 - Intraocular lens according to claim 12, 21. characterized in that it is intended to be implanted   in the posterior chamber of the eye, the lens csrps   the presents a front face and a rear face, and the means   This ring extends beyond the rear face: e d: corzs de la len-   tille so as to space this rear face of the posterior capsule.   14 - Intraocular lens according to the claim   tion 12, characterized in that the ring means is constituted   killed with glare-free blue material.   15 - Intraocular lens according to the claim   tion 12, characterized in that it further comprises positioning means in the body of the lens, this positioning means being located in areas of the body of the lens which absorb more light than the rest of the lens body.   16 - Intraocular lens, characterized in that it-   comprises: - a lens (42; 42 '; 42 ") having a first part transmitting light and a second part (45; 45', 45") having a transmissivity of light different from the first part, and   - means (48, 50; 48 ', 50'; 48 ", 50") for posi- cut the lens in the eye.   17 - Lens according to claim 16, characterized in that the first part has a periphery and a second part is arranged in a location contiguous to this periphery. 18 - Lens according to claim 16, characterized   in that the first part has a general periphery-   circular and the second part is arranged around the suburbs.   19 - Lens according to claim 16, characterized in that the second part provides a loss of transmission   of light greater than that of the first part.   20 - lens according to claim 16, character-   22. Seed in that the positioning means comprise at least two haptic elements extending towards the outside of the lens. 21 Lens according to claim 16, characterized in that the positioning means comprise at least two haptic elements extending radially outwards of the lens.   22- Lens according to claim 16, characterized in that the positioning means comprise at least   a lens manipulation means to assist in position-   lens during implantation.   23 - Lens according to claim 16, characterized   in that the positioning means form a portion part of the second part.   24 - Lens according to claim 16, character-   in that the lens has an anterior side and a pos-   posterior, and further includes means on the posterior side to prevent the posterior capsule of the eye from coming   in contact with the first part.   - Lens according to claim 16, character-   sée in that it has an anterior side and a posterior side,   and further includes a rib (96) on the posterior side.   26 - Lens according to claim 16, character-   in that the first and second parts are melted together.   27 - Lens according to claim 16, characteristic   in that the second part is brought to adhere to the first first part.   28 - Lens according to claim 16, characterized in that the first and second parts are joined together so as to be inseparable.   29 - Lens according to claim 16, character-   eee in that the second part defines an opening and the   first part is maintained in this opening.   - Lens according to claim 16, character-   in that the first part defines a discontinuity   optic and the second part is arranged so as to mask quer this discontinuity.   23. 31 - Lens according to claim 16, characterized in that the first part defines an edge and the second   part is arranged so as to hide this edge.   32 - Method for manufacturing an intraocu- lens   laire, characterized in that it comprises the stages consisting:   - provide a rod (74) of a first material transmits-   both the light, - mold a second material (78) around the rod   to form an imprint, the second material having a trans-   missivity of the light different from that of the first material   riau, and - cut the impression into slices (80) to form the lens. 33 - Method according to claim 32, characterized   in that it further comprises the step of providing a slow   tille with at least two haptic elements (48, 50; 48 ', 50'; 48 ", 50").   34 - Method according to claim 33, characterized in that it further comprises the step consisting of shaping the haptic elements with the second material - Method according to claim 33, characterized in that it further comprises the step consisting to shape   haptic elements from the imprint.   36 - Process according to claim 33, characterized   in that the second material consists of a dyed material   you. 37 - Method according to claim 32, characterized   in that it further comprises the step of position-   ner the rod in a mold (76), to inject the second material   riau in the mold and to heat the second material in the mold.   38 - Process according to claim 32, character-   se in that it co = also takes the steps of providing in the rod at least one groove (82) and filling   the groove with the second material.   39 - Process according to claim 32, character-   laughed in that it further comprises the step of drilling at least one positioning hole (70; 70 '; 70 ") in the 24.   lens formed from the imprint.   - Method according to claim 32, character-   se in that it further comprises the step of forming   at least two haptic elements separately from the footprint   and attach the haptic elements to the lens. 41 - The method of claim 40, characterized in that it further comprises the step of applying   a dye with haptic elements.   42 - Method of manufacturing an intraocu- lens   laire, characterized in that it comprises the stages consisting in:   - form a body (42; 42 '; 42 ") from a pre-   mier light transmitting material, - forming a lens support element (45; 45 '; 45 "),   - give the support element a coloring so that the light transmissivity of the support element is different from that of the lens, and   - fix the lens to the support element.   43 - Method according to claim 42, character-   se in that the support member is fashioned from a   second material with different light transmissivity te of that of the first material.   44 - Process according to claim 42, characterized   in that the support member is colored.   45 - A method according to claim 42, characterized in that it further caoprerd the step of forming an opening in the support member and fixing the body of the lens in the opening.   46 - The method of claim 42, characterized 3C in that it c: mprernd further the step of giving the support member at least one positioning hole (70; 70 '; 70 ").   47 - Method of manufacturing an intra-lens   eyepiece according to claim 32, said lens comprising a lens body (42; 42 '; 42 ") and at least two fixing elements in position 48.50; 48', 58 '; 48", 58 "), characterized in what it comprises the steps consisting in: 25. - placing a rod means (74) of clear plastic material in a mold means (76),   - surround the rod means with a plastic material   that (78) of another color, - heating the rod means and the colored plastic material so as to form a molten casting,   - cut the casting into sections (80), each   not having a clear plastic center, and - fabricating the intraocular lens from the sections using the clear plastic center as part   optics of the lens and by forming the fixing elements   tion in position from the colored plastic material.   48 - Method for manufacturing an intra-   eyepiece according to claim 47, characterized in that it further comprises the step of leaving a strip of colored plastic material around the peripheral edge   clear plastic center to form an absorbing anti-reflective ring bant the light (45; 45 '; 45 ").   49 - Method for manufacturing an intraocular lens   re according to claim 47, characterized in that it comprises   further the steps of forming anti-re-   flets (72; 72 ', 72 ") in the lens body and to-   provide positioning means in these areas.   - Process for the manufacture of an intraocular lens   lon claim 32, said lens comprising a lens body (42; 42 '; 42 ") and a multitude of haptic elements (48.50; 48', 50 ', 48", 50 "), characterized in that '' it includes the steps of - molding a section of clear acrylic material inside a section of blue colored acrylic material to form a block of two-tone material, and - making the intraocular lens in one piece from the block using clear acrylic material to   the optical part of the lens body and the acrylic material   only colored blue for the haptic elements.