USRE32525E - Universal intraocular lens and a method of measuring an eye chamber size - Google Patents

Universal intraocular lens and a method of measuring an eye chamber size Download PDF

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Publication number
USRE32525E
USRE32525E US06/797,656 US79765685A USRE32525E US RE32525 E USRE32525 E US RE32525E US 79765685 A US79765685 A US 79765685A US RE32525 E USRE32525 E US RE32525E
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lens
elements
intraocular lens
snag
flexible
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US06/797,656
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Jaswant S. Pannu
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Johnson and Johnson Surgical Vision Inc
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Assigned to ADVANCED MEDICAL OPTICS, INC. reassignment ADVANCED MEDICAL OPTICS, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ALLERGAN PHARMACEUTICALS, INC., ALLERGAN SALES, LLC, ALLERGAN, INC., AMERICAN HOSPITAL SUPPLY CORPORATION, HEYER-SCHULTE CORPORATION, INNOVATIVE SURGICAL PRODUCTS, INC.
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/14—Eye parts, e.g. lenses, corneal implants; Implanting instruments specially adapted therefor; Artificial eyes
    • A61F2/16—Intraocular lenses
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/14—Eye parts, e.g. lenses, corneal implants; Implanting instruments specially adapted therefor; Artificial eyes
    • A61F2/16—Intraocular lenses
    • A61F2002/1681—Intraocular lenses having supporting structure for lens, e.g. haptics
    • A61F2002/1683—Intraocular lenses having supporting structure for lens, e.g. haptics having filiform haptics

Definitions

  • An intraocular lens is normally implanted in the anterior or posterior chamber of an eye following extraction of a cataractous lens. Since replaceable lenses are different for use in a posterior chamber than use in an anterior chamber, two different lenses must be kept in stock. In addition, the eye chamber could vary in size, again requiring additional varied sizes in stock.
  • Shearing type lenses are utilized only for posterior chamber implantation. It is a plastic lens having two opposed flexible strands, one a superior loop and the other an inferior loop, wherein the free ends are arched and end in a point. This makes it extremely difficult for a surgeon to master the implantation of the superior loop during realignment or removal of the lens without injuring the delicate tissue of an eye.
  • One of the main objects of this invention is to avoid this snagging point of the loop by replacing it with a snag resistant disc, ring or closed circular loop.
  • Another object is to provide such a snag resistant strand so that both right and left handed surgeons may be able to use the same lens, thus eliminating the need for a specially designed lens for a left handed surgeon.
  • Another object is to provide a universal lens that can be used in an anterior or posterior chamber of an eye and can be equally used in a small, medium or large eye chamber size, thus avoiding the stocking of a large number of different types and sizes by hospitals and surgeons.
  • Another object is to provide just one type of universal lens for all eye transplants so that all surgeons will become familiar with it and greater safety can be provided for the patients.
  • Another object is to so tangentially shape the flexible strand as to cause the lens to self-center when implanted.
  • a further object is to use the distance between the ring edge and the lens edge to determine the size of an eye chamber.
  • FIG. 1 is an illustration of the intraocular lens of this invention in a front elevational view
  • FIG. 2 is a side elevational view of the lens of FIG. 1;
  • FIG. 3 is another form of the lens in a front elevational view
  • FIG. 4 is a cross-sectional schematic view of a human eye with the lens of this invention implanted in the posterior chamber;
  • FIG. 5 is a similar cross-sectional schematic view of a human eye with the same lens implanted in an anterior chamber;
  • FIG. 6A to D is a schematic cross-sectional view to illustrate how the eye chamber is measured for size.
  • intraocular lens 10 of this invention having a lens body 12 measuring 6 mm in diameter and centration openings 17 that measure 0.25 mm in diameter which may be used for alignment of the lens during implantation of the lens.
  • the lens is formed of clinical quality of polymethymethacrylate and has an overall length of 13.5 mm inclusive of the flexible strands 14 which are tangentially curved towards the lens circumference to the left on the superior strand while the inferior strand is tangentially curved to the right. This enables a surgeon to implant the lens with minimal force and permits the lens to be self-centering.
  • the snag resistant looped disc 16 and strand 14 are integrally molded to the body of the lens.
  • the thickness of the strand is 0.25 mm and the lens thickness is 0.85 mm as shown in FIG. 2.
  • FIG. 3 there is shown another form of the intraocular lens 10' of this invention.
  • the body 21 of the lens and the resilient strands 25 supporting the snag resistant rings 23 are integrally molded to the lens body, however to provide a sturdier base 24, the shape is molded into a triangular design which supports the flexible strand and said strand is shaped to be tangential to the lens circumference.
  • this lens is an actual commercial model and upon implantation, it automatically becomes self centered.
  • this ring be at least three times greater than the width of the flexible strand and at least one-fifth as great as the width of the lens to result in smoothly guiding the snag resistant ring across the iris or other eye tissue when implanting the lens in either an anterior or posterior chamber which is small, medium or large.
  • this lens is implanted into a posterior chamber as shown in FIG. 4, the snag resistant free end rings will snugly fit into the pocket found near the stationary zone of the iris 26.
  • the lens when so implanted is self-centering and the rings lie in a plane sufficiently close to the plane of the lens so that the rings and the lens can snugly fit into the eye chamber without causing any spring back or buldging forward which would injure delicate eye tissue.
  • the lens of this invention can dispense with such holes because with the ring structure and the tangentially shaped resilient strands, the .[.right.]. .Iadd.ring .Iaddend.is self centerable.
  • FIG. 5 there is shown the implantation of this novel lens into an anterior chamber of an eye.
  • the snag resistant free end of the tangential strand fits snugly in the corners between the mobile zone of the iris 26 and the cornea 27.
  • the lens is again self centering because of the same factors present in the posterior implantation.
  • FIG. 6 there is shown a schematic illustration of how to measure the size of an eye chamber.
  • the lens of this invention having a lens body whose diameter is 6 mm and whose ring diameter is 2.5 mm.
  • such a lens is implanted in an eye chamber 33. The distance between the loop and the lens edge is measured to be 1 mm. When added together, it measures a 13 mm eye chamber size which is a large chamber size.
  • a 12 mm eye chamber is measured which is a medium chamber size.
  • the eye chamber measures 11 mm which is a small chamber size. To aid in sighting for measuring, it is helpful to slightly tint the snag resistant rings, however they could also be clear.
  • the most important advantage is the provision of a snag resistant loop which prevents injury to delicate eye tissue during implantation, centration, or removal of the lens.
  • the lens of the Shearing type requires more maneuvers, skill and a longer learning process for surgeons to master when inserting the superior loop of the lens, thus resulting in increasing the chance for injuring delicate eye tissue. These objections are eliminated when the snag resistant lens of this invention is used. It would be relatively easy for a surgeon to master the implantation, centration or removal of this lens without injury to delicate eye tissue.
  • Another advantage is that only a small force is needed by the surgeon to position the superior snag resistant ring during implantation.
  • the tangentially curved resilient strands and the snag free loose end of the strand transfers this force into a circular movement of the lens body resulting in self centering of the lens with avoidance of undue pressure on the zonules below.
  • the lens of the invention is one that is a universal lens, a surgeon who is a novitiate will find this lens especially helpful because this lens is not only self-centering but also needs only minimal manipulation during implantation in an eye chamber.
  • Implantation of this new lens avoids the spring back which is present in the Shearing type lens which results in decentration.
  • This lens because of its tangentially formed strands, changes the downward force into a circular motion, thus avoiding any spring back landing to cause decentration.
  • All conventional posterior lenses are more easily implanted through a dilated pupil.
  • the new snag free lens can be implanted through a dilated or a miotic pupil with equal ease.
  • the surgeon may decide to use this lens in the anterior chamber to avoid aborting the implantation procedure. This cannot be done with any of the prior art lenses. However, it can be done if the surgeon is using the lens of this invention.
  • the lens of this invention is the first universal lens implant since it can be implanted in any size of eye chamber, in a posterior chamber or in an anterior chamber. A tremendous saving in the stocking of an unduly large supply of lenses for surgeons and hospitals. Only the snag resistant lens of this invention need be stocked. No necessity now to stock many different sizes, a posterior lens and an anterior lens. All the different lenses have now been replaced with only one lens, a universally useful lens.
  • this novel lens can be used to determine the size of an eye chamber. This has never been possible before this lens. By merely measuring the distance between the edge of the loop and the edge of the lens with a microscopic chronometer and adding thereto the diameter of the ring and lens, the size of an eye chamber can be determined. No lens in the prior art is capable of effecting this result.
  • the ring which is approximately circular, could also be elliptical and would thus be equally useful with all the accompanying advantages so long as it is snag resistant.

Abstract

A universal intraocular lens that may be implanted in an eye, in an anterior chamber, in a posterior chamber and in any size eye chamber wherein a tangential flexible strand is attached to a lens at one end and the other free end is formed into a snag resistant ring, or disc which is approximately circular to avoid injury to delicate eye tissue during implantation, centration or removal of said lens.

Description

BACKGROUND OF THE INVENTION
This application is a continuation-in-part of application Ser. No. 136,243 which was filed on Apr. 1, 1980 and now abandoned by applicant. The content of said application is incorporated in this application.
An intraocular lens is normally implanted in the anterior or posterior chamber of an eye following extraction of a cataractous lens. Since replaceable lenses are different for use in a posterior chamber than use in an anterior chamber, two different lenses must be kept in stock. In addition, the eye chamber could vary in size, again requiring additional varied sizes in stock.
The most widely used Shearing type lenses are utilized only for posterior chamber implantation. It is a plastic lens having two opposed flexible strands, one a superior loop and the other an inferior loop, wherein the free ends are arched and end in a point. This makes it extremely difficult for a surgeon to master the implantation of the superior loop during realignment or removal of the lens without injuring the delicate tissue of an eye.
One of the main objects of this invention is to avoid this snagging point of the loop by replacing it with a snag resistant disc, ring or closed circular loop.
Another object is to provide such a snag resistant strand so that both right and left handed surgeons may be able to use the same lens, thus eliminating the need for a specially designed lens for a left handed surgeon.
Another object is to provide a universal lens that can be used in an anterior or posterior chamber of an eye and can be equally used in a small, medium or large eye chamber size, thus avoiding the stocking of a large number of different types and sizes by hospitals and surgeons.
Another object is to provide just one type of universal lens for all eye transplants so that all surgeons will become familiar with it and greater safety can be provided for the patients.
Another object is to so tangentially shape the flexible strand as to cause the lens to self-center when implanted.
A further object is to use the distance between the ring edge and the lens edge to determine the size of an eye chamber.
Details of this invention will become more readily apparent from the following description when taken in conjunction with the accompanying drawings:
IN THE DRAWINGS
FIG. 1 is an illustration of the intraocular lens of this invention in a front elevational view;
FIG. 2 is a side elevational view of the lens of FIG. 1;
FIG. 3 is another form of the lens in a front elevational view;
FIG. 4 is a cross-sectional schematic view of a human eye with the lens of this invention implanted in the posterior chamber;
FIG. 5 is a similar cross-sectional schematic view of a human eye with the same lens implanted in an anterior chamber; and
FIG. 6A to D is a schematic cross-sectional view to illustrate how the eye chamber is measured for size.
In FIG. 1, there is shown intraocular lens 10 of this invention, having a lens body 12 measuring 6 mm in diameter and centration openings 17 that measure 0.25 mm in diameter which may be used for alignment of the lens during implantation of the lens. The lens is formed of clinical quality of polymethymethacrylate and has an overall length of 13.5 mm inclusive of the flexible strands 14 which are tangentially curved towards the lens circumference to the left on the superior strand while the inferior strand is tangentially curved to the right. This enables a surgeon to implant the lens with minimal force and permits the lens to be self-centering. The snag resistant looped disc 16 and strand 14 are integrally molded to the body of the lens. The thickness of the strand is 0.25 mm and the lens thickness is 0.85 mm as shown in FIG. 2.
In FIG. 3, there is shown another form of the intraocular lens 10' of this invention. The body 21 of the lens and the resilient strands 25 supporting the snag resistant rings 23 are integrally molded to the lens body, however to provide a sturdier base 24, the shape is molded into a triangular design which supports the flexible strand and said strand is shaped to be tangential to the lens circumference. In use, this lens is an actual commercial model and upon implantation, it automatically becomes self centered. It is essential that this ring be at least three times greater than the width of the flexible strand and at least one-fifth as great as the width of the lens to result in smoothly guiding the snag resistant ring across the iris or other eye tissue when implanting the lens in either an anterior or posterior chamber which is small, medium or large. When this lens is implanted into a posterior chamber as shown in FIG. 4, the snag resistant free end rings will snugly fit into the pocket found near the stationary zone of the iris 26. The lens when so implanted is self-centering and the rings lie in a plane sufficiently close to the plane of the lens so that the rings and the lens can snugly fit into the eye chamber without causing any spring back or buldging forward which would injure delicate eye tissue.
Although centration holes are normally provided on such lenses, the lens of this invention can dispense with such holes because with the ring structure and the tangentially shaped resilient strands, the .[.right.]. .Iadd.ring .Iaddend.is self centerable.
In FIG. 5, there is shown the implantation of this novel lens into an anterior chamber of an eye. The snag resistant free end of the tangential strand fits snugly in the corners between the mobile zone of the iris 26 and the cornea 27. In this instance, the lens is again self centering because of the same factors present in the posterior implantation.
Because of the ring shaped free end it is possible to use this lens for the first time to measure the size of the eye chamber.
In FIG. 6, there is shown a schematic illustration of how to measure the size of an eye chamber. In (a) there is shown the lens of this invention having a lens body whose diameter is 6 mm and whose ring diameter is 2.5 mm. In (b) such a lens is implanted in an eye chamber 33. The distance between the loop and the lens edge is measured to be 1 mm. When added together, it measures a 13 mm eye chamber size which is a large chamber size. In (c), wherein the ring to lens distance is less, a 12 mm eye chamber is measured which is a medium chamber size. In (d), wherein the ring and lens edges meet, the eye chamber measures 11 mm which is a small chamber size. To aid in sighting for measuring, it is helpful to slightly tint the snag resistant rings, however they could also be clear.
To sum up, there are many advantages in using the lens of this invention over any of the prior art lenses.
The most important advantage is the provision of a snag resistant loop which prevents injury to delicate eye tissue during implantation, centration, or removal of the lens.
The lens of the Shearing type requires more maneuvers, skill and a longer learning process for surgeons to master when inserting the superior loop of the lens, thus resulting in increasing the chance for injuring delicate eye tissue. These objections are eliminated when the snag resistant lens of this invention is used. It would be relatively easy for a surgeon to master the implantation, centration or removal of this lens without injury to delicate eye tissue.
Another advantage is that only a small force is needed by the surgeon to position the superior snag resistant ring during implantation. The tangentially curved resilient strands and the snag free loose end of the strand transfers this force into a circular movement of the lens body resulting in self centering of the lens with avoidance of undue pressure on the zonules below.
Since the lens of the invention is one that is a universal lens, a surgeon who is a novitiate will find this lens especially helpful because this lens is not only self-centering but also needs only minimal manipulation during implantation in an eye chamber.
Implantation of this new lens avoids the spring back which is present in the Shearing type lens which results in decentration. This lens, because of its tangentially formed strands, changes the downward force into a circular motion, thus avoiding any spring back landing to cause decentration.
All conventional posterior lenses are more easily implanted through a dilated pupil. The new snag free lens can be implanted through a dilated or a miotic pupil with equal ease.
If during a cataract operation, the delicate tissue of an eye is ruptured, use of the Shearing type lens with its free pointed end presents added danger of extending the tear because the free pointed end can slide further into the vitreous cavity. The snag resistant ring of this new lens avoids this difficulty.
In addition, while operating to be safe, the surgeon may decide to use this lens in the anterior chamber to avoid aborting the implantation procedure. This cannot be done with any of the prior art lenses. However, it can be done if the surgeon is using the lens of this invention.
The lens of this invention is the first universal lens implant since it can be implanted in any size of eye chamber, in a posterior chamber or in an anterior chamber. A tremendous saving in the stocking of an unduly large supply of lenses for surgeons and hospitals. Only the snag resistant lens of this invention need be stocked. No necessity now to stock many different sizes, a posterior lens and an anterior lens. All the different lenses have now been replaced with only one lens, a universally useful lens.
Finally, this novel lens can be used to determine the size of an eye chamber. This has never been possible before this lens. By merely measuring the distance between the edge of the loop and the edge of the lens with a microscopic chronometer and adding thereto the diameter of the ring and lens, the size of an eye chamber can be determined. No lens in the prior art is capable of effecting this result.
Those skilled in the art will also readily appreciate that there are various other modifications and adaptations of the precise form of the lens herein shown. For example, the ring which is approximately circular, could also be elliptical and would thus be equally useful with all the accompanying advantages so long as it is snag resistant.

Claims (10)

What is claimed is:
1. An intraocular lens comprising:
a lens body;
at least two spaced flexible positioning and supporting elements integrally formed with said lens body as a one-piece construction and extending radially, outwardly from the periphery of said lens body;
said elements .[.defining a continuous, substantially circular arc having a diameter greater than the diameter of said lens body, said arc curved toward said lens circumference and.]. terminating in a free end spaced from said periphery; and
snag-resistant means integrally formed on the free end of .Iadd.each of .Iaddend.said elements for smoothly guiding and positioning the lens across contacted eye tissue when implanting the lens, said snag resistant means having an uninterrupted, continuously, smoothly curved outer periphery which merges with said free end and is .[.substantially.]. .Iadd.at least three times .Iaddend.greater in .[.size.]. .Iadd.width .Iaddend.than the width of said flexible elements.Iadd., said snag resistant elements and said positioning and supporting elements being substantially coplanar. .Iaddend.
2. An intraocular lens as recited in claim 1 wherein there are two of said flexible positioning and supporting elements and said elements are positioned opposite one another.
3. An intraocular lens as recited in claim 1 wherein said snag-resistant means comprise a circular disc.
4. An intraocular lens as recited in claim 3 wherein said disc has an opening therethrough.
5. An intraocular lens as recited in claim 3 wherein said disc has a diameter which is at least three times greater than the width of said flexible elements and at least one-fifth as great as the width of said lens body.
6. An intraocular lens as recited in claim 1 wherein said flexible elements contain a support member integrally formed with said flexible elements and the periphery of said lens body, said support member joined to said flexible element at a position remote from the point where said flexible element contacts the periphery of said lens body, thus defining a substantially triangular support base for said flexible element.
7. An intraocular lens as recited in claim 3 wherein said circular disc and said lens body lie in substantially the same vertical plane.
8. An intraocular lens as set forth in claim 1 wherein said flexible elements and said snag-resistant means are made from a clear material.
9. An intraocular lens as set forth in claim 1 wherein said flexible elements and said snag-resistant means are made from a colored material.
10. A method of measuring the size of an eye chamber by implanting a lens having tangentially resilient strands on opposed sides of an intraocular lens attached to the body of said lens; wherein the free end is connected to a snag resistant ring, adding the diameter sizes of said ring and said lens to the distance between the edge of said ring and the edge of said lens in mm. to determine the size of said eye chamber in mm. .Iadd.11. An intraocular lens as recited in claim 1 wherein said elements define a continuously curved arc, said arc curved toward said lens circumference. .Iaddend.
US06797656 1980-04-01 1985-11-13 Universal intraocular lens and a method of measuring an eye chamber size Expired - Lifetime USRE32525F1 (en)

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Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US13624380A 1980-04-01 1980-04-01
US06797656 USRE32525F1 (en) 1980-04-01 1985-11-13 Universal intraocular lens and a method of measuring an eye chamber size

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US13624380A Continuation-In-Part 1980-04-01 1980-04-01
US06/261,953 Reissue US4435855A (en) 1980-04-01 1981-05-08 Universal intraocular lens and a method of measuring an eye chamber size

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USRE32525F1 USRE32525F1 (en) 1989-05-09

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US6190410B1 (en) 1999-04-29 2001-02-20 Bausch & Lomb Surgical, Inc. Intraocular lenses
US6200344B1 (en) 1999-04-29 2001-03-13 Bausch & Lomb Surgical, Inc. Inraocular lenses
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US20020116062A1 (en) * 1999-05-14 2002-08-22 Valdemar Portney Iris fixated intraocular lens suitable for use with attaching instrument
US6461384B1 (en) 1999-06-17 2002-10-08 Bausch & Lomb Incorporated Intraocular lenses
US6475240B1 (en) 2000-02-02 2002-11-05 Advanced Medical Optics, Inc. Anterior chamber intraocular lens and methods for reducing pupil ovalling
US6478821B1 (en) 2000-01-12 2002-11-12 Advanced Medical Optics, Inc. Iris fixated intraocular lens and method of implantation
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US6547822B1 (en) 2000-05-03 2003-04-15 Advanced Medical Optics, Inc. Opthalmic lens systems
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US6554859B1 (en) 2000-05-03 2003-04-29 Advanced Medical Optics, Inc. Accommodating, reduced ADD power multifocal intraocular lenses
US6576012B2 (en) 2001-03-28 2003-06-10 Advanced Medical Optics, Inc. Binocular lens systems
US6599317B1 (en) 1999-09-17 2003-07-29 Advanced Medical Optics, Inc. Intraocular lens with a translational zone
US6616693B1 (en) 2000-05-03 2003-09-09 Advanced Medical Optics, Inc. Flexible fixation members for angle-supported anterior chamber intraocular lenses
US6616692B1 (en) 1999-04-30 2003-09-09 Advanced Medical Optics, Inc. Intraocular lens combinations
US6638305B2 (en) 2001-05-15 2003-10-28 Advanced Medical Optics, Inc. Monofocal intraocular lens convertible to multifocal intraocular lens
US6645246B1 (en) 1999-09-17 2003-11-11 Advanced Medical Optics, Inc. Intraocular lens with surrounded lens zone
US6660035B1 (en) 2000-08-02 2003-12-09 Advanced Medical Optics, Inc. Accommodating intraocular lens with suspension structure
US20040068317A1 (en) * 2002-10-07 2004-04-08 Knight Patricia M. Anterior chamber intraocular lens with size and position indicators
US20040116937A1 (en) * 2002-12-12 2004-06-17 Valdemar Portney IOL insertion tool with forceps
US6755859B2 (en) 2000-12-11 2004-06-29 Bausch & Lomb Incorporated Iris fixated intraocular lenses
US6790232B1 (en) 1999-04-30 2004-09-14 Advanced Medical Optics, Inc. Multifocal phakic intraocular lens
US20040186568A1 (en) * 2003-03-21 2004-09-23 Advanced Medical Optics, Inc. Foldable angle-fixated intraocular lens
US6972033B2 (en) 2002-08-26 2005-12-06 Advanced Medical Optics, Inc. Accommodating intraocular lens assembly with multi-functional capsular bag ring
US20050283163A1 (en) * 2004-06-04 2005-12-22 Valdemar Portney Intraocular lens implanting instrument
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