JPS62161360A - Intraocular lens and its production - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to intraocular lenses, and more particularly, to intraocular lenses, and more particularly, to intraocular lenses that are designed to prevent the edges of the lens from scattering or reflecting light, resulting in streaks or ghost images. Relating to a lens having a protective optical surface around the periphery.

BACKGROUND OF THE INVENTION In the human eye, the crystalline lens is located behind the stoma and the iris and functions to focus light passing through the cornea and the stoma onto the retina at the back of the eye. The crystalline lens is a biconvex, highly transparent structure made of ectodermal cells surrounded by a thin capsule. This crystal joint is supported around its outer circumference by the frenulum that connects to the ciliary muscle and the suspensory ligament. The contraction and expansion of this muscle causes the zonules to relax and tense, changing the shape of the crystalline lens and thereby changing its focal length.

A cataract condition occurs when the material within the lens mouth becomes cloudy, thereby blocking the path of light. Two types of surgery are used to correct this condition: intraoral surgery and capsular surgery. In intracapsular cataract extraction, the entire lens is removed intact.

To accomplish this, the surgeon cuts the frenulum or suspensory ligament around the entire circumference of the capsule and removes the entire lens, leaving the capsule and its contents intact.

In capsular cataract extraction, an incision is made through the genital wall (the "bistomia") of the lens, and the cloudy cellular material in the mouth is removed through this opening.

Various abrasion, aspiration, or phacoemulsification techniques are used to accomplish the extraction procedure. Membrane wall of the transparent posterior capsule (
The "posterior capsule") is left in place within the eye. The frenulum and the circumferential portion of both mouths are also left in place.

Intraocular lenses are used as a replacement for the crystalline lens after either capsular or intraoral surgery. After implantation, the intraocular lens serves as a device for vision correction in the eye.

Prior art for intraocular lenses includes various types of fixation and stabilization of intraocular implants such that the central or inner lens body is held in a stable position relative to the ocular canal and the visual axis. It encompasses many different lens designs according to the method.

Generally, intraocular lenses are placed in the posterior layer, between the iris and cornea, and in the anterior chamber, directly behind the iris.
It consists of three types: one supported directly by the iris;

All three types of lenses are customarily specified in part according to the needs of the patient and in part according to the preferences of the physician who inserts the lens.

Intraocular lenses typically include an optical element and a lens extending generally radially from the optical element and typically within the sclera for anterior chamber lenses and either within the ciliary sulcus or the lens os for posterior lenses. It consists of two or more tactile members including a seating part. In the case of an iris-supported lens, the haptic member contacts the iris to center the optic within the canal.

The optical element is typically a circular transparent optical lens approximately 6 mm in diameter. The haptic member of most lenses is a flexible strand or filament that is attached to the lens at one end and has a second portion extending radially away from the lens to form a seating foot.

Several haptic designs are currently in use, such as a pair of U-shaped loops with both ends of each loop attached to the lens, and U-shaped loops with only one end of the loop attached to the lens. It is being

More recently, several other types of intraocular lenses have been developed for the anterior chamber and/or the posterior chamber. Some of these lenses are described in U.S. Pat. No. 4,174.
No. 543, No. 4.328゜595, No. 4.412.3
No. 59, No. 4,418.431, No. 4,426.74
No. 1, No. 4゜435.855, No. 4,437,194
No. 4.441.217, No. 4.480.340, Nail No. 4,502.162, No. 4.502.183,
No. 4,503,570, No. 4.504.981, and No. 31.626 (reissue).

The currently available models and types of intraocular lenses are such that they are either generally rigid monolithic structures made of one type of material, or generally two or three pieces often made from different types of materials. It may also consist of In multi-component lenses, the central optic is generally made of polymethyl methacrylate (PMMΔ), while the peripheral fixed portion is made of a different material, such as polypropylene (brolene), and the material Mechanically bonded to the optical body. To assist the surgeon in implanting and positioning the lens within the eye, it often occurs that a plurality of small holes, grooves, or detents are disposed around the outer periphery of the lens body.

The problem that the invention aims to solve All intraocular lenses encounter one major defect.

All of them reflect or refract some of the light that enters them in a way that creates ghost images, streaks of light, or other shimmer or glare on the wearer. These images and streaks are undesirable and degrade the optical quality of the lens.

Scattered light is primarily caused by the edges of the circular lens body, although it is often also caused by the inner ends of the haptic members (where they are joined or inserted into the lens body) as well as locating grooves or holes. The edges of the lens are rounded (to obtain a smooth, non-irritating outer surface), thus reflecting light into the eye and onto the retina at almost any angle and in any direction. It can be refracted. The perforations and edges of the tactile member also create obstacles to the uniform passage of light, and also reflect and refract light rays in various directions, causing various undesirable "
Ghost-like shapes and forms may occur.

The problem of striped and ghost images is also caused by any of the three types of intraocular lenses: posterior lens, anterior chamber lens, or iris-supported lens. This problem is most severe when the intraocular lens is initially placed off-center within the eye, or later pushed into a slightly off-center position. This may cause one edge of the lens body, one or more positioning pads, or one of the ends of the haptic member to be in direct line of sight.

This problem is also acute in low light conditions where the ocular foramen enlarges to a size approximately equal to or larger than the diameter of the lens body. Therefore, intraocular lens wearers
Difficulty driving at night or in other low light conditions.

By their nature, intraocular lenses are small and transparent, and are often difficult for surgeons to see and handle. The lens body itself is generally only about 5 to 7 tm in diameter, and the total length of today's typical intraocular lenses is only about 12 to 14 mm.
It is m. Intraocular lenses are made of highly transparent material (
For example, it is made from poly(methyl methacrylate). Similarly,
The positioning member (i.e. the haptic) is generally a relatively transparent material such as polypropylene or polymethyl methacrylate.
The implant is therefore not easily visible to others, especially if the lens is used in the anterior chamber.

This small, transparent intraocular lens presents the most significant visual sensitivity problem during implantation of the lens into the posterior layer. For the surgeon, when the lens is partially inserted into the eye,
It is sometimes difficult to see and therefore confirm the exact location of the ends of the loop.

Some current multi-piece lenses have a tactile loop of a different color than the optic portion which alleviates some of the problem. However, to date, it has not been possible to create a monolithic lens that includes a transparent lens and a colored haptic portion.

It would be desirable to provide an intraocular lens that reduces or eliminates edge glitter and glare during use by a patient and provides better visibility to the surgeon during implantation and positioning. One of the main objects of the present invention is to provide an intraocular lens for both the anterior chamber and the posterior chamber that satisfies these objectives.

Another object of the present invention is to provide an integrally defined intraocular lens having a transparent optic (lens body) portion and a colored or opaque haptic portion.

Yet another object of the present invention is to provide an intraocular lens that includes a band of light-absorbing material around the outer periphery of the lens to prevent stray scattered/reflected light from being generated by the edges of the lens. This intraocular lens should also prevent stray light from being generated by the locating aperture and the junction between the haptic loop and the lens body.

It is also an object of the present invention to provide an intraocular lens that satisfies the above-mentioned objectives and that can be easily and universally manufactured and used.

SUMMARY OF THE INVENTION An intraocular lens according to the present invention is designed to overcome the problems of known intraocular lenses and to satisfy the above objects and intentions. The present invention can be utilized with intraocular lenses of almost any shape and size and with haptic members of almost any type or style. It can also use lenses implanted within the anterior chamber, posterior layer, or attached within the iris plane.

According to a preferred embodiment of the invention, the intraocular lens has a lens body with a band of optically different material, such as a light-absorbing or anti-dust material, around its outer periphery. The band is made radially wide enough to provide edge rounding and smoothing, which is customary in the field of intraocular lenses to prevent tissue damage from rough or sharp edges. The band is of the same material as the rest of the lens because it absorbs most or all of the light that passes through it.
It can be made by adding dye. The lens and band can be formed from a single piece of material with a clear central visual portion and an outer colored portion. The haptic loop of an intraocular lens can be formed into any of a variety of contours and shapes known in the art, and is also preferably dyed or otherwise colored. The haptic member can be made of the same material as the lens body or a different material, and is attached to the lens body in any conventional manner.

The guard band can also be made of a different Plasdec material than the central viewing portion, both materials having different absorption properties, different colors, different transparency, and/or different refractive indices. Similarly, the outer periphery of the lens should be I! Marking may be done by etching after fabrication or by some other method.

In another embodiment of the invention, a monolithic intraocular lens is provided with a colored band around its outer periphery and a correspondingly colored integral tactile loop. The lens is molded in one piece to its final shape and then finished or smoothed. Alternatively, the lens can be manufactured from a blank of colored material into its final shape, utilizing a transparent circular central portion for the optical lens.

In yet another embodiment of the invention, a portion within the lens is provided with a colored or light-absorbing material to cover the locating hole and attachment location of the haptic loop.

Other objects, intentions, features, and advantages of the invention will be apparent to those skilled in the art from consideration of the following description and claims. The invention is also more particularly and clearly illustrated in the accompanying drawings.

EXAMPLES AND OPERATION FIG. 1 shows a normal eye, indicated generally by the reference numeral 10. Portions of the ocular structures that are not considered essential to an understanding of the invention have been omitted for clarity.

The cornea 12 is disposed on the outside of the ocular structure. The cornea 12 is a clear, transparent tissue that acts as a light-transmitting element. The cornea also has some ability to focus light onto the retina (not shown) at the back of the eye. The light transmitted through the cornea passes through the anterior chamber 14 and the watery aqueous humor disposed therein and impinges on the crystalline lens 16 . The crystalline lens acts as the primary focusing element for light transmitted through it onto the retina. The chamber behind the crystalline lens 16 is filled with vitreous humor 18 . The crystalline lens 16 is enclosed within a capsule 2o having an anterior membrane 22 and a posterior membrane 24.

The anterior membrane 22 is commonly known as the "anterior membrane," the posterior membrane 24 is commonly known as the "posterior capsule," and the entire capsule 20 is often referred to as a "bag."

The iris 26 is disposed between the cornea 12 and the crystalline lens 16, and functions similar to a diaphragm that adjusts the amount of light that hits the crystalline lens 16. The central opening of the iris 26 is called the foramen 28. The natural lens 16 is located in the posterior layer 30 of the eye. The anterior chamber is the front part of the iris (between the cornea and iris), and the posterior chamber is the part behind the iris. The cornea and iris meet at the outer edge of the iris to form a groove 32. Corner 32 extends around the periphery of the iris and is where the majority of the anterior chamber intraocular lens is disposed and mounted in place.

As indicated earlier, when a cataract develops, a cloudy area appears within the lens 16. These opaque areas affect light transmittance and impair vision. When this opacification becomes sufficiently severe, the only effective therapy is extrinsic removal of the lens itself, either by supination cataract surgery or pronation cataract surgery.

The intraocular prosthesis of the eye 10 is indicated generally by the reference numeral 4o in FIG. Inserted into the posterior layer of the eye after pronated cataract surgery 4
0 is shown. Insert 40 may be formed of any suitable material compatible with the ophthalmic environment, such as non-toxic plastic materials such as polymethyl methacrylate, polypropylene or silicone.

As indicated at the outset, the invention also relates to an intraocular lens inserted into the anterior chamber or supported by the iris. Although these are not shown in the figures, those skilled in the art will readily understand the manner in which the present invention relates to and may be utilized with this type of lens.

The insert 40 includes an inner light focusing lens body 42 having a convex or flat front surface 44 and a convex or flat rear surface 46 . A pair of position fixing members or tactile loop members 48.5o arranged in opposite directions are attached to the lens body 42.
Stretch from the outer periphery on the opposite side. When the intraocular lens is placed in the anterior chamber 14 of the eye, the outer ends of the fixation elements 48,50 fit into the horns 32. When the intraocular lens is placed in the posterior layer of the eye (as shown in FIG. 2), the outer end of the positioning member seats in the scleral aperture 51 of the ciliary body.

The positioning member can be made of any material that is non-toxic to the material of the eye and also compatible with the material of the lens body, such as polypropylene (Prosyn). However, preferably, according to the invention, the haptic part is made of the same material as the lens body.
That is, it is preferably formed of polymethyl methacrylate. The haptics can be made of monofilament strands of material heat-set in the desired configuration and shape, or directly molded or machined into the precise shape.

A preferred embodiment according to the invention is illustrated in FIG. The clear optic portion 42 of this intraocular lens has a rim or band portion 45 around its outer periphery to prevent sideways scattered or reflected light from being generated by the edges of the lens. Band portion 45 is preferably made of the same material as visual portion 42, except that a dye has been added to change its color and make it light absorbing. The preferred dye is blue because it is received by the haptic member of the posterior lens. However, it has been found that any colored dye Fl can be used and that a series of lenses can be provided with various colored band portions to match the actual natural color of the recipient's eyes.

To match the color of the band portion 45, the tactile portion 48.
50 is also stained. In fact, in the case of a one-piece lens as shown in FIG. 3, the haptics are formed simultaneously with and integrally with the lens body.

This one-piece device can be injection or cast molded (and smoothed with minimal finishing operations) into the desired final shape, or the device can be machined from a larger block of material with a clear visual area in the center. be able to.

In the intraocular lens shown in FIG. 3, the position fixing member is
It is shown as having a figure 5 shape similar to the [Shearing J and [Simcoc] J type posterior layer intraocular lenses. However, it should be understood that the structures described above are used for illustrative purposes only, and that any size, style, or shape of positioning member may be utilized in accordance with the present invention. Additionally, as indicated at the outset, the present invention can be used with either anterior chamber or posterior chamber lenses, so that different haptics and positioning members are commonly used for different types of lenses. .

In this regard, there may be 2.3.4 or more positioning members around the outer circumference of the lens body. Additionally, the fixing members of each lens may all be the same or some may be different, and the fixing members may be strands of material formed or molded in desired locations, or they may be flat strands of material. , a rigid disk or a loop.

In the configuration shown in FIG. 3, the tactile member 48°50 is
Two contacts 60 on opposite sides of the lens body connect integrally to the band portion and thus to the lens body 42. The rounded intersection points 62 allow for a smooth transition between the band and the haptic member, resulting in a stronger joint. The end 52 of the haptic member curves back toward the lens body to prevent snagging of ocular tissue during insertion and implantation of the intraocular lens.

If a band 45 is formed on the lens body, it must be made sufficiently wide in the radial direction so that it still fully surrounds the outer circumference of the edge after the typical edge rounding and smoothing process is completed. There is. This smoothing step is used to prevent tissue damage from rough or sharp edges. Band 45 is preferably made of the same material as the transparent optic portion 42 of the intraocular lens, with the addition of a blue dye that absorbs most of the light that passes through it.

Thus, any light that hits the band of the lens,
Rather than being transmitted through, it is absorbed. This prevents this light from scattering and creating ghost images due to refraction by the rounded edges of the lens.

Similarly, light that enters through a transparent part (and would otherwise hit a rounded edge and generate a scattered ghost image) absorbs from a clear plastic part without a change in direction at the interface. It passes directly into the band area and is absorbed by the dyed plastic. The colored rim or band portion 45 thus reduces glare caused by reflection of light from peripheral or edge surfaces and/or other structures and devices.

The colored rim portion and haptic members also allow for easier visualization of the lens and its position during insertion and implantation by the surgeon. This reduces the chance of complications occurring during surgery and saves the lens from being implanted in an off-center position.

Similar light absorption or protection effects can be achieved by providing other types of materials or surfaces around the outer periphery of the lens body. For example, a colored rim or band portion may be colored or applied to the edge of the lens body after it has been formed, rolled and smoothed. Similarly, a protective surface may be etched or mechanically formed on the outer peripheral surface of the lens body, as long as it is still sufficiently smooth and the material is compatible with the internal fluids and tissues of the eye. . In the broadest sense, anything that limits the transmission of visible light may be fastened to, fixed to, embedded in, or part of the outer periphery of the lens body. It is common to provide an intraocular lens with one or more locating holes, grooves, or detents so that it can be more easily manipulated, implanted, and positioned by the surgeon. A pair of positioning holes 70 are shown in FIG. This locating hole ensures that they are not in the optical path or in the wearer's field of vision.
It is placed around the outer periphery of the lens body. In order to minimize or prevent ghost images or scattered light streaks from being created by the locating holes, the portion 72 of the lens body around the hole 7o is formed of the same material as the edge portion 45.

A preferred apparatus for manufacturing a one-piece intraocular lens with a non-glare rim and haptic member is shown in FIGS. 6 and 7.

To produce a two-color embodiment of the invention as shown in FIG. 3, a cylindrical rod 74 of transparent polymethyl methacrylate material is made or obtained. The diameter of the rod is 5-6
m, which, when finished, constitutes the central visual part 42 of the lens. The rod is placed in a mold 76 surrounded along its length by a blue polymethyl methacrylate material 78, preferably in crystal or powder form. The mold is then heated in a conventional manner to melt and mold the colored polymethyl methacrylate and deposit it on the rod of clear polymethyl methacrylate material. Also, conventional degassing devices, such as vacuum or suction mechanisms, may be used to ensure that all air bubbles and possible voids within the material are removed during the casting process.

It is also understood that other conventional plastic manufacturing processes and techniques may be used to make dichroic lenses. For example, the lens may be made by injection molding a blue material around a rod or piece of transparent material.

Once the casting or molding process is complete, a thin section 80 of the two-tone material is cut with the clear visual area in the center. For monolithic lenses, this section is greater than 12-14#1I11 in one direction and 6In in the other direction.
Must be greater than IR.

Rectangular sections of two-color material are then shaped into the final lens shape (shown in dashed lines in Figure 7) using precision lathe techniques.
made in Conventional final finishing and polishing procedures are then utilized. The positioning hole 70 is drilled in the lens body by a precision drilling mechanism. When this monolithic lens is finished, it leaves a thin band or rim 45 of colored material around the optic portion 42.
It looks like the embodiment shown in FIG.

The band 72 around the locating hole is formed by providing a long depression or groove 82 along the outer edge of the cylindrical rod 74 before it is inserted into the colored material. This is shown in Figure 8. When the final lens material is cast or molded, the depressions or grooves are filled with colored material. The material filling groove 82 forms colored portion 72 of the final lens. When the locating holes 70 are drilled in the lens 40, they are drilled into the colored portion 72.

Figures 4a3 and 5 show another embodiment of the invention.

Where principal points or parts are the same as those described above for Figure 3, the parts are similarly numbered, except with the addition of a dash (Figure 4) or a double dash (Figure 5). It is attached.

FIG. 4 shows a monolithic intraocular lens 40' comprising a transparent lens body 42' and colored haptic members 48', 50'. This lens 40' can be molded or formed as one integral piece of material in the same manner as described above with respect to FIGS. 3 and 6-8. However, when the lens body 42' is machined, all of the blue or colored material surrounding the outer periphery of the lens body is removed.

As shown in FIG. 4, a colored locator hole portion 72' can be left in place to minimize and prevent ghost images from being created by the hole 70'.

In FIG. 5, a lens 40'' is shown comprising three separately manufactured lenses that are assembled together to form the final intraocular lens device.
It has m pieces. Lens body 42'' has a transparent central portion and a peripheral band portion 45'' that includes dye or other light absorbing material or feature. This band portion 45'' is formed of the same plastic material as the optic portion, but with pigment added to it.The lens body blank is formed to a diameter and thickness larger than the desired knurling, and its final Machined to size and shape.

The two tactile members 48'', 50'' include thin strands or filaments of material that are resilient and have "memory" so that they bend when a force is applied, yet bend when the force is removed. Spring back or return to its original shape. Each of the optics consists of a monofilament strip of polymeric material such as polypropylene (prosyn), polymethyl methacrylate, etc.
It is Rand. The haptic portion is permanently fixed to the lens body by gluing, heat staking, etc., and is preferably inserted into a small hole in the outer periphery of the lens body.

The optic elements 48'', 50'' are stained or colored similarly to the band portion 45''. This allows for easier visualization of their position during surgery or post-operative examination.

In yet another embodiment of the invention (FIG. 9).

It is possible to separately manufacture a colored ring (or one made of anti-scald or absorbent material) and paste it around the outer periphery of the transparent lens body. For example, the lens body 86 may be snap fit into a separately manufactured ring 84. This optic member 88 can be integrally formed as part of the ring 84 or attached thereto as a separate filament.

In still other embodiments of the invention, silicone materials can be used for all or part of the intraocular lens. A silicone ring can be molded or cast around the outer periphery of the lens body, and the silicone can be colored or otherwise designed with anti-inflammatory or light-absorbing structures. . It is also possible to make the separate ring 84 of FIG. 9 from silicone into which the lens body snap-fits. The ring may have supporting and centering devices integrally formed therein, or these devices may be manufactured separately and attached to the ring.

If desired, both the lens body and the ring (molded, cast, or separate ring) may be made of silicone material. In this type of embodiment, the lens body is preferably made of a harder silicone material than the outer ring.

If it is desired to include a laser ridge in the intraocular lens, the ridge should preferably be made of a colored or light-absorbing material to minimize and prevent glare therefrom. 10 does not show a cross section of lens body 90 with laser ridge 92. FIG. Laser Ridge will later be made of yztrium aluminum garnet (YAG).
) is used in the posterior lens to separate the posterior lens from the posterior surface 94 of the lens so that the posterior lens can be anteriorized by a laser or the like. The laser ridge is generally formed as a raised annular ridge surrounding the rear perimeter of the lens body. In accordance with the present invention, both the edge of the lens body 9o and the laser ridge 92 are formed of colored or light-absorbing materials.

The intraocular lens according to the present invention can be inserted into the eye using appropriate, well-known medical procedures, either in the anterior chamber or in the posterior gyrus. These steps are the natural crystalline lens 1
6 involves passing the desired intracameral Hellen's structure through the corneal-scleral incision that is also used to remove the.

Although the present invention has been described in detail above with respect to retrograde intraocular lenses, it does not matter whether the intraocular lenses are implanted in the anterior chamber, the posterior gyrus, or whether they are supported or located in the iris. It can be seen that the invention can also be used in intraocular lenses. With any of these three types of lenses, it is always possible for the lens to be implanted slightly off-center or moved slightly off-center by the wearer during use. Also, in the case of posterior lenses, the present invention has unique application in J3 low light conditions where the ocular foramen is fully or nearly dilated.

In these conditions, the diameter of the foramen is often
It is larger than the diameter of the implanted lens body, making it more possible for light to shine on or pass through the periphery of the lens body.

In retroversion lenses or most iris lenses, light enters the intraocular lens from all directions and is often scattered or reflected from the edge of the lens body located just in front of the foramen. If a band of absorbing material is stretched around the outer circumference of the lens, the rounded edges of the lens can cause refractive scattering or ghost images.

The above discussion discloses merely exemplary embodiments of the invention;
This is what I explained. From the above discussion, it will be readily apparent to those skilled in the art that various changes, modifications, and variations can be made thereto without departing from the spirit and scope of the invention as defined by the claims. Let's be recognized.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of a normal eye, Figure 2 is a cross-sectional view of an eye with a retrograde intraocular lens implanted in its position after supination cataract surgery.
Figures 3 to 5 and Figures 9 to 10 show various embodiments of intraocular lenses according to the invention, and Figures 6 to 8 show preferred methods for manufacturing the products of the invention. It is a diagram. 10: Eye 14: Anterior chamber 30: Retroversion 40: Intraocular lens 42.90
: Lens body 45: Band part 48.50: Tactile part 70: Positioning hole 74: Rod 76 U-shaped 80: Section 82: Groove 87i = ring 92: Rib 94: Rear surface

Claims (50)

[Claims] (1) A lens body having an outer periphery, a position fixing device attached to the lens body for positioning and centering the lens body within the eye, and a safety device on the outer periphery of the lens body. , an intraocular lens implant for intraocular implantation. (2) The intraocular lens according to claim 1, wherein the lens body and the position fixing device are made of one piece made of the same material. (3) The intraocular lens according to claim 1, wherein the position fixing device consists of two tactile members, which are made separately from the member lens body and fixed thereto. . (4) The intraocular lens according to claim 1, wherein the protection device includes a band made of a colored material. (5) The intraocular lens according to claim 4, wherein the band made of a colored material is formed by dyeing a part of the material forming the lens body. . (6) The intraocular lens according to claim 1, wherein the lens body includes at least one anti-friction positioning device. (7) The intraocular lens according to claim 6, wherein the anti-ocular positioning device includes, in the lens body, a portion made of an anti-ocular material and having an opening. (8) The intraocular lens according to claim 1 includes a spacer device on the lens body to separate the rear surface of the lens body from the posterior capsule when the intraocular lens is implanted in the posterior chamber of the eye. an intraocular lens, wherein the spacer device is made of an anti-inflammatory material. (9) The lens body includes a lens body and at least two position fixing members for positioning and centering the lens body within the eye, and the lens body and the position fixing member are formed in one piece, and An intraocular lens implant for intraocular implantation, wherein the position fixing member is made of the same material and has a different color from the lens body. (10) In the intraocular lens according to claim 9, the lens body is transparent, the position fixing member is blue, and both the lens body and the fixing member are made of polymethyl methacrylate. An intraocular lens designed to allow (11) The intraocular lens according to claim 9,
The intraocular lens includes at least one positioning device in the lens body, and a portion where the positioning device is located includes a material of the same color as the positioning member. (12) comprising a lens body and a ring device attached to the outer periphery of the lens body, the ring being made of a material that is a lighter absorbent material than the lens body, and positioning the lens body within the eye; An intraocular lens implant for intraocular implantation comprising a positioning device attached to the ring for centering. (13) The intraocular lens according to claim 12, wherein the intraocular lens is adapted to be implanted in the posterior chamber of the eye, and the lens body has an anterior surface and a posterior surface, An intraocular lens, wherein the ring device extends beyond the posterior surface of the lens body to separate the posterior surface from the posterior capsule. (14) The intraocular lens according to claim 12, wherein the ring device is made of a blue anti-dust material. (15) The intraocular lens according to claim 12 includes a positioning device in the lens body, and the positioning device is provided in a portion of the lens body that is an absorbent material that is lighter than the remaining portion of the lens body. An intraocular lens that is placed in place. (16) placing a rod device made of a transparent plastic material in a mold device; surrounding the rod device with a plastic material of a different color; heating and fusing the rod device and the colored plastic material; forming a cast article; cutting the cast article into a plurality of sections, each having a clear plastic core; and cutting the cast article into a plurality of sections, each having a clear plastic core; and cutting the cast article into a plurality of sections, each having a clear plastic core; and fabricating the intraocular lens from the section by forming the positioning member from the colored plastic material and fabricating the intraocular lens from the section. Production method. (17) The method for manufacturing an intraocular lens according to claim 16 leaves a band of colored plastic material around the outer periphery of the transparent plastic center and surrounds the band with light-absorbing material. A method for manufacturing an intraocular lens comprising the step of forming an anti-stain ring. (18) A method for manufacturing an intraocular lens according to claim 16, wherein the method includes the step of forming a protection portion on the lens body and providing a positioning device in the portion. . (19) molding a section of clear acrylic material within a section of blue acrylic material to form a block of two-color material; manufacturing the intraocular lens as one piece from the block using a blue acrylic material for the tactile member. . (20) An intraocular lens comprising a lens having a first light transmitting portion and a second portion having a different light transmittance from the first portion, and a device for positioning the lens within the eye. (21) The lens according to claim 20, wherein the first portion has a peripheral edge, and the second portion is disposed adjacent to the peripheral edge. (22) The lens according to claim 20, wherein the first portion has a generally circular periphery, and the second portion is disposed around the periphery. (23) The lens according to claim 20, wherein the second portion has a larger light transmission loss than the first portion. 24. The lens of claim 20, wherein the positioning device includes at least one tactile member extending outwardly from the lens. 25. The lens of claim 20, wherein the positioning device includes at least one haptic member extending radially outwardly from the lens. 26. The lens of claim 20, wherein the positioning device includes at least one lens manipulation device to assist in positioning the lens during implantation. (27) A lens according to claim 20, wherein the positioning device forms an integral part of the second portion. (28) The lens according to claim 20, wherein the lens has an anterior surface and a posterior surface, and further includes a device on the posterior surface that prevents the posterior capsule of the eye from contacting the first portion. lens. (29) The lens according to claim 20, wherein the lens has a front surface and a rear surface, and further includes a ridge on the rear surface. (30) The lens according to claim 20, wherein the first portion and the second portion are fused together. (31) The lens according to claim 20, wherein the second portion is bonded to the first portion. (32) The lens according to claim 20, wherein the first portion and the second portion are joined together so that they cannot be separated. (33) The lens according to claim 20, wherein the second portion defines an opening, and the first portion is held within the opening. (34) In the lens according to claim 20, the first portion defines a visually discontinuous portion, and the second portion is arranged so as to hide the discontinuous portion. lens. (35) The lens according to claim 20, wherein the first portion defines an edge, and the second portion is arranged so as to hide the edge. (36) providing a rod of a first material that is transparent to light; and molding a second material around the rod to form a blank, the second material being the same as the first material. A method of manufacturing an intraocular lens having different light transmittances and comprising slicing the blank to form the lens. (37) The method of claim 36 including the step of providing at least one tactile member on the lens. (38) The method of claim 37 including the step of making the tactile member from the second material. (39) The method according to claim 37, comprising the step of making the tactile member from the blank. (40) The method according to claim 37, wherein the second material includes a colored material. (41) The method according to claim 36, comprising: positioning the rod in a mold; injecting the second material into the mold; and injecting the second material into the mold. and heating the method. 42. The method of claim 36, comprising the steps of providing at least one groove in the rod and filling the groove with the second material. (43) The method of claim 36 including the step of drilling at least one positioning hole in the lens formed from the blank. 44. The method of claim 36, comprising the steps of forming at least one tactile member separately from the blank and securing the tactile member to the lens. (45) The method of claim 44, wherein the method includes the step of adding a dye to the tactile member. (46) forming a lens body from a first material that transmits light, forming a lens support member, and applying coloring to the support member so that the light transmittance of the support member is different from that of the lens; and securing the lens to the support member. (47) The method of claim 46, wherein the support member is made of a second material having a different light transmittance than that of the first material. (48) The method according to claim 46, wherein the support member is dyed. (49) The method according to claim 46, comprising the steps of forming an opening in the support member and fixing the lens body to the opening. (50) The method according to claim 46, comprising the step of providing at least one positioning hole in the support member.