WO2021144809A1 - Oval shaped optic intra-ocular lens with "l"-shaped haptic - Google Patents

Oval shaped optic intra-ocular lens with "l"-shaped haptic Download PDF

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Publication number
WO2021144809A1
WO2021144809A1 PCT/IN2021/050029 IN2021050029W WO2021144809A1 WO 2021144809 A1 WO2021144809 A1 WO 2021144809A1 IN 2021050029 W IN2021050029 W IN 2021050029W WO 2021144809 A1 WO2021144809 A1 WO 2021144809A1
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Prior art keywords
intra
shaped
ocular lens
lens
oval
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PCT/IN2021/050029
Other languages
French (fr)
Inventor
Kakadia JAGDEEP M.
Shah RAMESH CHIMANLAL
Original Assignee
Jagdeep M Kakadia
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Publication of WO2021144809A1 publication Critical patent/WO2021144809A1/en

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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 or corneal implants; Artificial eyes
    • A61F2/16—Intraocular lenses
    • A61F2/1613—Intraocular lenses having special lens configurations, e.g. multipart lenses; having particular optical properties, e.g. pseudo-accommodative lenses, lenses having aberration corrections, diffractive lenses, lenses for variably absorbing electromagnetic radiation, lenses having variable focus
    • A61F2/1616—Pseudo-accommodative, e.g. multifocal or enabling monovision
    • A61F2/1618—Multifocal 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 or corneal implants; Artificial eyes
    • A61F2/16—Intraocular lenses
    • A61F2002/1681—Intraocular lenses having supporting structure for lens, e.g. haptics
    • 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 or corneal implants; Artificial eyes
    • A61F2/16—Intraocular lenses
    • A61F2002/1696—Having structure for blocking or reducing amount of light transmitted, e.g. glare reduction
    • 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
    • A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0002—Two-dimensional shapes, e.g. cross-sections
    • A61F2230/0004—Rounded shapes, e.g. with rounded corners
    • A61F2230/0008—Rounded shapes, e.g. with rounded corners elliptical or oval
    • 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
    • A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0002—Two-dimensional shapes, e.g. cross-sections
    • A61F2230/0028—Shapes in the form of latin or greek characters
    • A61F2230/0043—L-shaped
    • G—PHYSICS
    • G02—OPTICS
    • G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
    • G02C7/00—Optical parts
    • G02C7/02—Lenses; Lens systems ; Methods of designing lenses

Definitions

  • the Present invention relates to Oval Shaped optic Multi-focal or mono focal Intra-ocular lens (IOL). More particularly, the present invention relates to Oval shaped optic Multi-focal or mono-focal Intra-ocular lens (IOL) with two "L"-shaped haptic members, which focuses an image on retina of the eye with field of view without the perception of visual artifacts & helps in significantly reducing or eliminating positive dysphotopsia such as glare, halos, starburst, visible rings and also eliminates negative dysphotopsia such as dark, grey or black crescent shaped hanging or floating shadows seen in the temporal peripheral visual field.
  • IOL Oval shaped optic Multi-focal or mono-focal Intra-ocular lens
  • the human eye is the sensory organ for reacting to light, focusing rays of light into an image on retina, retina converting the light signals into electrical impulses, which are conveyed by optic nerve to visual sensory occipital cortex of brain.
  • the optical power of the eye is determined by the optical power of the cornea and that of the natural crystalline lens, with the lens providing about a third of the eye's total optical power.
  • the anatomical structure of an anterior segment of the eye 10 is shown and includes a transparent outer layer, the cornea 12 that is continuous with an opaque sclera 14 forming the lateral white portion of the eye 10.
  • the cornea 12 encloses an anterior chamber 16 and posterior chamber 18, both filled with aqueous humor.
  • the anterior and posterior chambers 16, 18 are separated by the iris 20, which is a circular, muscular structure that controls the diameter of the centrally- disposed pupil 22 and provides the color portion of the eye 10.
  • the lens 24 is a transparent, biconvex structure that focuses incoming light onto the retina (not shown).
  • Suspensory ligaments, or zonules 26, suspend the lens 24 from ciliary bodies 28, which are muscular structures that contract to affect the convexity, i.e., shape, of the lens 24 and thereby adjust the focal distance of the eye 10.
  • the lens 24 itself is comprised of an outer membrane, the capsular bag 30, surrounding a group of compressed cells, the nucleus 32, and a less dense compression of cells, the cortex 34.
  • Cataracts are a medical condition that is manifested as decreased transparency, or clouding, of the lens 24 within the eye 10. The clouding may occur to any portion of the lens 24, including the nucleus 32, the cortex 34 and/or the capsular bag 30. Cataracts generally develop bilaterally, i.e., affecting both eyes, and to varying degrees ranging from a slight clouding to complete opacity and greatly reduce the transmission of light through the lens 24 to the retina (not shown). If left untreated, cataracts may result in blindness.
  • Intraocular lenses are routinely employed to replace such a clouded natural lens.
  • the placement of the IOL may vary.
  • one conventional surgical method positions the IOL within the capsular bag such that the haptic members engage an inner surface of the wall of the capsular bag and the IOL is located generally centrally within the capsular bag.
  • IOLs can substantially restore the quality of a patient's vision
  • some patients with implanted IOLs report aberrant optical phenomena, such as halos, glare or dark regions in their vision. These aberrations are often referred to as “dysphotopsia.”
  • some patients report the perception of shadows, particularly in their temporal peripheral visual fields. This phenomenon is generally referred to as “negative dysphotopsia.”
  • IOL anterior to the capsular bag within the posterior chamber has several potential disadvantages, including possible decentralization of the IOL and/or posterior iris chafing. Thus, placement of the IOL within the capsular bag may be preferred.
  • An intraocular lens implant for implantation within a capsular bag formed with a capsulorhexis defining a capsulorhexis edge comprising: - a lens having a convex anterior optical portion including a first convex portion and a second portion, and a posterior optical portion, the convex anterior optical portion and the posterior optical portion being located on opposite anterior and posterior sides, respectively, of a single circumferential edge of the lens, with the circumferential edge being positioned at and forming a single maximum diameter of the lens, the circumferential edge being defined by a single annular wall having an axial length and extending between an anterior edge and a posterior edge, with the anterior edge and the posterior edge being spaced apart by the length; an annular groove formed in the convex anterior optical portion between the first
  • Another US20080269886 of Alcon Inc. filed with a priority date April 30, 2007 has disclosed an IOL that includes an anterior surface and a posterior surface disposed about an optical axis, where the posterior surface includes a central region extending to a peripheral region.
  • the anterior surface and the central region of the posterior surface cooperatively form an image of field of view on the retina and the peripheral region of the posterior surface directs at least some light rays incident thereon (e.g., via refraction by the anterior surface) to at least one retinal location offset from the image so as to inhibit dysphotopsia.
  • US6790232B1 of Johnson and Johnson Surgical Vision Inc. filed with a priority date April 30, 1999 has disclosed an intraocular lens for use in a mammalian eye having a natural lens, the intraocular lens including a lens body sized and adapted for placement in the eye, and having a baseline optical power and at least one optical add power.
  • the at least one optical add power is reduced relative to the corresponding optical power of a similar intraocular lens adapted for placement in a similar eye in which the natural lens has been removed.
  • US4917681A of Johnson and Johnson Surgical Vision Inc. filed with a priority date August 24, 1987 has disclosed an intraocular lens, in the form of a disk, intended to replace the crystalline lens of a patient's eye, in particular after a cataract extraction, comprises on its distal side an aspherical sector extending approximately from the midline of the disk over one quarter of the surface thereof. The rest of the distal side is spherical. The radius of curvature of the aspherical sector varies monotonously between the value of the radius of the spherical sectors and a lower value. Such a configuration allows light rays impinging on the intraocular lens to be refracted at different angles and provides both near the distance vision.
  • the discontinuity at transition between the aspherical sector and the spherical sector is blocked out by dark or etched plastic to eliminate glare.
  • the proximal side can either be a convex surface, a concave surface or a plane. US5112351A of AMO Puerto Rico Manufacturing Inc.
  • a multifocal intraocular lens which comprises a lens body having at least five optical zones, a first zone comprising a central constant power zone for distance vision, a second zone comprising an annular aspheric zone, a third zone comprising a constant power zone for near vision, a fourth zone comprising an aspheric zone to bring the power back to the distance vision level and a fifth zone comprising a constant power zone for distance vision, whereby the radii for each optical zone is determined to minimize spherical aberrations and wherein the percent optical area for near and distance vision is calculated based on pupillary diameter and variation of pupillary apertures in humans for whom said lenses are designed.
  • US8382832B2 of Johnson and Johnson Surgical Vision Inc. filed with a priority date Dec 09, 2003 has disclosed a foldable intraocular lens for providing vision contains an optic body that includes an optical zone and a peripheral zone entirely surrounding the optical zone.
  • the optic body has an anterior face, a substantially opposing posterior face, an optic edge, and an optical axis.
  • the anterior face comprises a central face, a peripheral face, and a recessed annular face there between that is disposed posterior to the peripheral face.
  • the intraocular lens further comprises at least one haptic that is integrally formed with the peripheral zone.
  • the haptic comprises a distal posterior face, a proximal posterior face, and a step edge disposed at a boundary there between.
  • the haptic further comprises a side edge disposed between the optic edge and the step edge.
  • the proximal posterior face and the posterior face of the optic body form a continuous surface.
  • An edge corner is formed by the intersection of the continuous surface with the optic edge, the side edge, and the step edge.
  • US 5476513A of Johnson and Johnson Surgical Vision Inc. filed with a priority date February 28, 1992 has disclosed an intraocular lens for implantation in an eye comprising an optic configured so that the optic can be deformed to permit the intraocular lens to be passed through an incision into the eye.
  • a peripheral zone circumscribes the optical zone of the optic and one or more fixation members coupled to the peripheral zone and extending outwardly from the peripheral zone to retain the optic in the eye are provided.
  • the fixation member or members are located so that the optical zone is free of such member or members.
  • the peripheral zone preferably has a maximum axial thickness which is larger than the maximum axial thickness of the periphery of the optical zone.
  • Posterior capsule opacification is the most common complication of cataract surgery.
  • Posterior capsule opacification often referred to as “secondary cataract,” is the most common postoperative complication of cataract extraction.
  • the posterior capsule undergoes secondary opacification due to the migration, proliferation, and differentiation of lens epithelial cells (LECs).
  • LECs lens epithelial cells
  • PCO can cause significant visual symptoms, particularly when it involves the central visual axis.
  • IOL intraocular lens
  • PCO occurs in 20-50% of patients within 2 to 5 years of cataract surgery. Although the incidence of PCO is reported to have declined in recent years, there is no definitive data, and the reported decrease may represent only a later onset of PCO. Children and infants have a significantly higher incidence and earlier onset of PCO, along with the potential for associated amblyopia. In children, reported rates of PCO reach 100%. Younger age is a significant risk factor for PCO. Other potential risk factors include the presence of conditions such as diabetes, uveitis, myopic dystrophy, retinitis pigmentosa, and traumatic cataract. Hence, it is highly desirable and need of an hour to provide novel or unique Intra-ocular lens that can reduce or prevent Posterior Capsule Opacification (PCO).
  • PCO Posterior Capsule Opacification
  • none of prior art systems are having outlook and surface profile like mono-focal Intra-ocular lens but multi-focal progressive in functionality having unique optical profile.
  • Intra-ocular lens with a variable over all diameter proportionate to the axial length of eye ball, or inversely proportionate to the refractive status of patient's eye. Capsular bag diameter is bigger in long axial length eye balls and short in shorter axial length eye ball. So, one size-does-not-fit-all. All prior arts Intra ocular lens have only one fixed over all diameter. So, quite often it so happens that, an IOL is too big for small eyes, so it vaults in the bag; & IOL is too small for big eyes, so it freely rotates and may become off- centered in big diameter capsular bag.
  • IOL design is such that, it has different and variable over-all diameter of the lens for different diopters, such that for every individual eye having different capsular bag size, and also with differing power of IOL, over-all diameter of the lens is to be made such, that the IOL snugly and perfectly fits into the capsular bag, without being too loose and rotating or decentering, or without being too tight fitment and causing forward or backward vaulting in the capsular bag.
  • IOLs are having either "J' shaped, "C” shaped, plate shaped or plate with four big holes type design of haptics. Plate haptics with or without four hole are very difficult and tedious to implant during surgery. "J” or “C” shaped haptics are comfortable and easy to implant, but they suffer from a major disadvantage that they have only a single small point of contact, usually less than a millimeter, in the fornix of capsular bag, hence they are prone to rotation and decentration.
  • the said larger sized oval shaped anti-reflex optic helps in significantly reducing or eliminating positive dysphotopsia such as glare, halos, starbursts, visible rings; and also helps to eliminate negative dysphotopsia such as dark, grey or black crescent shaped hanging or floating shadows seen in the temporal visual field, providing the clearest and most natural human lens like vision to the eyes.
  • positive dysphotopsia such as glare, halos, starbursts, visible rings
  • negative dysphotopsia such as dark, grey or black crescent shaped hanging or floating shadows seen in the temporal visual field, providing the clearest and most natural human lens like vision to the eyes.
  • Intra-ocular lens with higher Modulation Transfer Function provides better, crisp and sharp vision with improved quantitative and qualitative vision, with almost natural human lens like clarity and contrast vision to the eyes.
  • the main object of the present invention is to overcome the problems faced by the prior art references.
  • the said larger sized oval shaped anti-reflex optic which helps in significantly reducing or eliminating positive dysphotopsia such as glare, halos, starbursts, visible rings; and also helps to eliminate negative dysphotopsia such as dark, grey or black crescent shaped hanging or floating shadows seen in the temporal visual field, providing the clearest and most natural human lens like vision to the eyes.
  • Intra-ocular lens with large oval optic of size of 6.0 to 6.5 mm by 7.2 to 8.1 mm with an anti- reflex surface, having the largest optic size compared to conventional Intra-ocular lens which focuses an image on retina of the eye with field of view without the perception of visual artifacts & helps in significantly reducing or eliminating positive dysphotopsia such as glare, halos, starburst, visible rings and also eliminates negative dysphotopsia such as dark, grey or black crescent shaped hanging or floating shadows seen in the temporal peripheral visual field.
  • positive dysphotopsia such as glare, halos, starburst, visible rings
  • negative dysphotopsia such as dark, grey or black crescent shaped hanging or floating shadows seen in the temporal peripheral visual field.
  • TMF Modulation Transfer Function
  • PCO Proliferative Posterior Capsule Opacification
  • PCO Fibrinous Posterior Capsule Opacification
  • Figure- 1 is a Cross-sectional view, in the sagittal plane, through an anterior segment of a healthy human eye.
  • Figure-2 is a Front view of Oval shaped Intra-ocular lens as per the present invention.
  • Figure-2 (A) is a front view of Oval shaped Intra-ocular lens as per the present invention.
  • Figure-3 is a Side view of Oval shaped Intra-ocular lens as per the present invention.
  • Figure-4(A) is a view of Left eye visual field, only partially covered with Conventional Round Lens with C-shaped haptic showing, Aphakic visual field and the lens edge causing negative dysphotopsia.
  • Figure-4(B) is a view of Left eye visual filed, fully covered with oval shaped optic Lens with L-shaped haptic.
  • the Present invention relates to Oval Shaped Multifocal Intra-ocular lens (IOL) (1). More particularly, the present invention relates to Oval (2) shaped Multi-focal Intra-ocular lens (IOL) with L-shaped haptic members (3), which focuses an image on retina of the eye with field of view without the perception of visual artifacts & helps in significantly reducing or eliminating positive dysphotopsia such as glare, halos, starburst, visible rings and also eliminates negative dysphotopsia such as dark, grey or black crescent shaped hanging or floating shadows seen in the temporal peripheral visual field.
  • IOL Oval Shaped Multifocal Intra-ocular lens
  • the uniqueness or Novelty of the present invention resides in the shape, configuration, size of the multi-focal intra-ocular lens (1) that makes the lens totally different from the conventional IOLs in terms of benefits, functionality & usages.
  • an oval (2) shaped Intra-ocular lens (1) for providing the clearest and most natural human lens like vision to the eyes
  • the Intra-ocular lens (1) comprises: an Oval (2) shaped optic size with an anti-reflex surface that focuses an image on retina of the eye with field of view without the perception of visual artifacts and helps in significantly reducing or eliminating positive dysphotopsia such as glare, halos, starburst, visible rings and also eliminates negative dysphotopsia such as dark, grey or black crescent shaped hanging or floating shadows seen in the temporal peripheral visual field; diametrically opposed L-shaped haptic members (3) having capsular bag fornix contact surface of 6 to 6.5 mm by 0.25 to 0.35 mm.
  • Oval (2) shaped multi-focal Intra-ocular lens (1) are provided with unique optical surface profile having outlook similar to mono-focal Intra-ocular lens (1) but is true multi-focal progressive in functionality.
  • positive dysphotopsia such as glare, halos, starbursts, visible rings
  • negative dysphotopsia such as dark, grey or black crescent shaped hanging or floating shadows seen in the temporal peripheral visual field
  • Intra-ocular lens (1) As an optical profile of Intra-ocular lens (1) is almost a mono-focal profile yet functions as multi-focal lens due to induction of refractive index gradient, it helps in reducing or almost eliminating positive dysphotopsia such as glare, halos, starbursts, visible rings.
  • Overall length of Intra-ocular lens (1) with L- shaped haptic members (3) is from 10.5 to 14.5 mm. Further, the thickness of haptic members (3) is in a range between 250 to 350 microns.
  • the length of lens (1) is selected as per the size of the patient’s eyes, the large oval (2) optical size eliminates negative dysphotopsia such as dark, grey or black crescent shaped hanging or floating shadows seen in the temporal peripheral visual field, and provides clear and near natural vision to the eyes”.
  • the multi-focal Intra-ocular lens (1) of the present invention is provided with higher Modulation Transfer Function (MTF).
  • Modulation Transfer Function (MDF) depends on the smoothness of optic surface of Intra ocular lens (1). The smoother the optic surface, higher is the Modulation Transfer Function (MTF), and the higher the MTF, better is the provided vision with improved quality, clarity and contrast to the eyes.
  • MTF function is measurable in lens (1) at manufacturing stage. Also it is possible to measure after implantation into eye by machines such as OPD-scan and iTrace. However, post-operative measurements are not benchmark or considered standard, because these measurements are affected by clarity and curvature of cornea and optical problems in vitreous and retina.
  • MTF can be tested on various Zernike profile wave front aberration meter machines like Rotlex IOLA+. This is measured for all lenses.
  • ISO standard for MTF is "lowest 0.43 for far vision" wherein MTF for the Intra-ocular lens as per the present invention is kept in a range between 0.45 to 0.95, preferably between 0.5 to 0.90 for far vision which is much higher than the required MTF.
  • the said oval (2) shaped multi-focal intra-ocular lens (1) is having 360 degree sharp square or rectangle edges (4) in their shape (As shown in Figure-2 (A) & 3) and all round square edge (5), the said square edges (4) of the lens (1) overlap the periphery of the posterior portions of the eyes and help in preventing posterior capsule opacification (PCO) .
  • Figure-4(A) is a view of Left eye visual field, only partially covered with Conventional Round Lens with C-shaped haptic showing, Aphakic visual field and the lens edge/border causing negative dysphotopsia.
  • Figure-4(B) shows a view of left eye visual field covered with Lens (1) with L-shaped haptic members (3) as per the present invention.
  • IOL (1) with L-shaped haptic fits in the eyes in such a way so that it covers full visual field.
  • IOL (1) While comparing IOL (1) with L-shaped haptic members (3) of the present invention with conventional Lens with C-shaped haptic, IOL (1) covers full visual field while Conventional IOL do not cover full visual field of the eye, instead it covers partial visual field that creates Aphakic visual field and negative dysphotopsia for the eyes. This is due to smaller square or rectangle edges (4) of IOL and shape of optic used for IOL.
  • oval (2) shaped IOL (1) with L- shaped haptic members (3) & desired square or rectangle edges (4) covers large horizontal visual field which helps in avoiding negative dysphotopsia while fixing the Lens with a minimum 6.0 mm arc length contact area at capsular bag fornix provides large area of friction which provides better rotational stability within the eyes. While in conventional IOL, due to their lesser square or rectangle edges, it provides lesser than needed horizontal visual field and creates negative dysphotopsia in many cases. In case of conventional IOL, only a tip of C-shaped haptic is in touch of capsular bag fornix and so creates less area of friction which provides lesser rotational stability than the IOL of the present invention.
  • the Oval (2) shaped multi-focal intra-ocular lens (1) comprises a transparent structure constructed from a polymeric, silicone, acrylic, or other suitable moldable material having a refractive index similar to the natural native lens 24 (FIG. 1).
  • the L-shaped haptic members (3) may be constructed from a soft material such as hydrophobic polymer, hydrophilic polymer, copolymer of hydrophobic-hydrophilic polymer, extruded poly-methyl methacrylate (“PMMA”), polypropylene, silicone, or acrylic other than the IOL optic in case of a three-piece IOL; or it may be formed from the same material as of optic body of IOL in case of single-piece IOL.
  • PMMA poly-methyl methacrylate
  • the soft material allows the haptic members to be folded for insertion through the capsulorhexis edge and deployment within the capsular bag.
  • An Oval (2) shaped Intra-ocular lens (1) can be made using a convention methods for example: (A) Either a button of proper and chosen biocompatible polymer plastic or silicon material is lathed and then milled to a shape of intraocular lens, which is known as lathe-mill- punch-cut technique OR (B) intra-ocular lens is made by pouring liquid polymer into a mold and allowing it to be solidified into a lens - which is known as injection molding technique. Contact surface of L-shaped haptic members (3) of Intra-ocular lens (1) are frosted and very gently and mildly roughened such that immediate or late post- operative in-the- bag rotation of whole Intraocular lens (1), or optic of Intra-ocular lens is prevented.
  • the said Intra-ocular lens (1) can be inserted with the techniques known in prior art, insertion of lens can be done by holding and folding forceps or by lens injector and cartridge or from small or big scleral or corneal incision.
  • An Intra-ocular lens with oval optic of size of 6.0 to 6.5 mm by 7.2 to 8.1 mm, with an anti-reflex surface, having the largest optic size compared to all conventional Intra-ocular lens, the said largest optic size helps in reducing or eliminating positive dysphotopsia such as glare, halos, starbursts, visible rings; and eliminates negative dysphotopsia such as dark, grey or black crescent shaped hanging or floating shadows seen in the temporal peripheral visual field, and provides clear and near natural vision to the eyes.
  • positive dysphotopsia such as glare, halos, starbursts, visible rings
  • negative dysphotopsia such as dark, grey or black crescent shaped hanging or floating shadows seen in the temporal peripheral visual field, and provides clear and near natural vision to the eyes.
  • Intra-ocular lens with unique optic body surface profile having outlook similar to mono-focal Intra-ocular lens but true multi-focal progressive in functionality.
  • Oval shaped multi-focal intra-ocular lens having 360 degree true square or rectangle edges; which helps to prevent posterior capsule opacification (PCO).
  • L-shaped haptic members of intra-ocular lens help the said lens in fixing appropriately and permanently, preventing rotation or decentration in the capsular bag.
  • Intra-ocular lens with higher Modulation Transfer Function that provides better vision, quality, clarity and contrast to the eyes.
  • MTF Modulation Transfer Function

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  • General Health & Medical Sciences (AREA)
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  • Veterinary Medicine (AREA)
  • Prostheses (AREA)

Abstract

The Present invention relates to Oval Shaped optic Multi-focal or mono-focal Intra-ocular lens (IOL). More particularly, the present invention relates to Oval shaped optic Multi-focal or mono-focal Intra-ocular lens (IOL) with two "L"-shaped haptic members, which focuses an image on retina of the field of view without the perception of visual artifacts & helps in significantly reducing or eliminating positive dysphotopsia such as glare, halos, starburst, rings and also eliminates negative dysphotopsia such as dark, grey or black crescent shaped hanging or floating shadows seen in the temporal peripheral visual field.

Description

DESCRIPTION OF THE PRESENT INVENTION TITLE OF THE INVENTION:
“OVAL SHAPED OPTIC INTRA-OCULAR LENS WITH "L"-SHAPED HAPTIC”
FIELD OF THE PRESENT INVENITON
The Present invention relates to Oval Shaped optic Multi-focal or mono focal Intra-ocular lens (IOL). More particularly, the present invention relates to Oval shaped optic Multi-focal or mono-focal Intra-ocular lens (IOL) with two "L"-shaped haptic members, which focuses an image on retina of the eye with field of view without the perception of visual artifacts & helps in significantly reducing or eliminating positive dysphotopsia such as glare, halos, starburst, visible rings and also eliminates negative dysphotopsia such as dark, grey or black crescent shaped hanging or floating shadows seen in the temporal peripheral visual field.
BACKGROUND OF THE PRESENT INVENTION
The human eye is the sensory organ for reacting to light, focusing rays of light into an image on retina, retina converting the light signals into electrical impulses, which are conveyed by optic nerve to visual sensory occipital cortex of brain. The optical power of the eye is determined by the optical power of the cornea and that of the natural crystalline lens, with the lens providing about a third of the eye's total optical power.
As shown in FIG. 1, the anatomical structure of an anterior segment of the eye 10 is shown and includes a transparent outer layer, the cornea 12 that is continuous with an opaque sclera 14 forming the lateral white portion of the eye 10. The cornea 12 encloses an anterior chamber 16 and posterior chamber 18, both filled with aqueous humor. The anterior and posterior chambers 16, 18 are separated by the iris 20, which is a circular, muscular structure that controls the diameter of the centrally- disposed pupil 22 and provides the color portion of the eye 10. Light enters the eye 10 through the cornea 12, passes through the aqueous humor of the anterior chamber 16 and the pupil 22 to the lens 24. The lens 24 is a transparent, biconvex structure that focuses incoming light onto the retina (not shown). Suspensory ligaments, or zonules 26, suspend the lens 24 from ciliary bodies 28, which are muscular structures that contract to affect the convexity, i.e., shape, of the lens 24 and thereby adjust the focal distance of the eye 10. The lens 24 itself is comprised of an outer membrane, the capsular bag 30, surrounding a group of compressed cells, the nucleus 32, and a less dense compression of cells, the cortex 34.
The process of aging as well as certain diseases, such as diabetes, can cause clouding of the natural lens, a condition commonly known as cataract, which can adversely affect a patient's vision. Cataracts are a medical condition that is manifested as decreased transparency, or clouding, of the lens 24 within the eye 10. The clouding may occur to any portion of the lens 24, including the nucleus 32, the cortex 34 and/or the capsular bag 30. Cataracts generally develop bilaterally, i.e., affecting both eyes, and to varying degrees ranging from a slight clouding to complete opacity and greatly reduce the transmission of light through the lens 24 to the retina (not shown). If left untreated, cataracts may result in blindness.
Intraocular lenses are routinely employed to replace such a clouded natural lens.
During cataract surgery, the placement of the IOL may vary. For example, one conventional surgical method, positions the IOL within the capsular bag such that the haptic members engage an inner surface of the wall of the capsular bag and the IOL is located generally centrally within the capsular bag. Although such IOLs can substantially restore the quality of a patient's vision, some patients with implanted IOLs report aberrant optical phenomena, such as halos, glare or dark regions in their vision. These aberrations are often referred to as “dysphotopsia.” In particular, some patients report the perception of shadows, particularly in their temporal peripheral visual fields. This phenomenon is generally referred to as “negative dysphotopsia.”
Further positioning the IOL anterior to the capsular bag within the posterior chamber has several potential disadvantages, including possible decentralization of the IOL and/or posterior iris chafing. Thus, placement of the IOL within the capsular bag may be preferred.
Number of references may be cited for Intra-ocular lens. Some of them are briefly discussed as below:
According to US9433498B2 of Samuel Masket filed with a priority date April 12, 2010, the present invention relates to intraocular lens implants and, more particularly, to intraocular lens implants and surgical methods for reducing negative dysphotopsia. An intraocular lens implant for implantation within a capsular bag formed with a capsulorhexis defining a capsulorhexis edge, comprising: - a lens having a convex anterior optical portion including a first convex portion and a second portion, and a posterior optical portion, the convex anterior optical portion and the posterior optical portion being located on opposite anterior and posterior sides, respectively, of a single circumferential edge of the lens, with the circumferential edge being positioned at and forming a single maximum diameter of the lens, the circumferential edge being defined by a single annular wall having an axial length and extending between an anterior edge and a posterior edge, with the anterior edge and the posterior edge being spaced apart by the length; an annular groove formed in the convex anterior optical portion between the first convex portion and the second portion and being defined by an anterior wall and a posterior wall, with the second portion extending radially inwardly from the anterior edge of the annular wall and the entire annular groove being positioned anteriorly of the annular wall and extending from a surface of the convex anterior optical portion and being configured to receive the capsulorhexis edge, and a haptic member extending outwardly from the circumferential edge. Another US20080269886 of Alcon Inc. filed with a priority date April 30, 2007 has disclosed an IOL that includes an anterior surface and a posterior surface disposed about an optical axis, where the posterior surface includes a central region extending to a peripheral region. Once the IOL is implanted in a patient's eye, the anterior surface and the central region of the posterior surface cooperatively form an image of field of view on the retina and the peripheral region of the posterior surface directs at least some light rays incident thereon (e.g., via refraction by the anterior surface) to at least one retinal location offset from the image so as to inhibit dysphotopsia.
US6790232B1 of Johnson and Johnson Surgical Vision Inc. filed with a priority date April 30, 1999 has disclosed an intraocular lens for use in a mammalian eye having a natural lens, the intraocular lens including a lens body sized and adapted for placement in the eye, and having a baseline optical power and at least one optical add power. The at least one optical add power is reduced relative to the corresponding optical power of a similar intraocular lens adapted for placement in a similar eye in which the natural lens has been removed.
US4917681A of Johnson and Johnson Surgical Vision Inc. filed with a priority date August 24, 1987 has disclosed an intraocular lens, in the form of a disk, intended to replace the crystalline lens of a patient's eye, in particular after a cataract extraction, comprises on its distal side an aspherical sector extending approximately from the midline of the disk over one quarter of the surface thereof. The rest of the distal side is spherical. The radius of curvature of the aspherical sector varies monotonously between the value of the radius of the spherical sectors and a lower value. Such a configuration allows light rays impinging on the intraocular lens to be refracted at different angles and provides both near the distance vision. The discontinuity at transition between the aspherical sector and the spherical sector is blocked out by dark or etched plastic to eliminate glare. The proximal side can either be a convex surface, a concave surface or a plane. US5112351A of AMO Puerto Rico Manufacturing Inc. filed on Oct 12, 1990 has disclosed a multifocal intraocular lens which comprises a lens body having at least five optical zones, a first zone comprising a central constant power zone for distance vision, a second zone comprising an annular aspheric zone, a third zone comprising a constant power zone for near vision, a fourth zone comprising an aspheric zone to bring the power back to the distance vision level and a fifth zone comprising a constant power zone for distance vision, whereby the radii for each optical zone is determined to minimize spherical aberrations and wherein the percent optical area for near and distance vision is calculated based on pupillary diameter and variation of pupillary apertures in humans for whom said lenses are designed.
US8382832B2 of Johnson and Johnson Surgical Vision Inc. filed with a priority date Dec 09, 2003 has disclosed a foldable intraocular lens for providing vision contains an optic body that includes an optical zone and a peripheral zone entirely surrounding the optical zone. The optic body has an anterior face, a substantially opposing posterior face, an optic edge, and an optical axis. The anterior face comprises a central face, a peripheral face, and a recessed annular face there between that is disposed posterior to the peripheral face. The intraocular lens further comprises at least one haptic that is integrally formed with the peripheral zone. The haptic comprises a distal posterior face, a proximal posterior face, and a step edge disposed at a boundary there between. The haptic further comprises a side edge disposed between the optic edge and the step edge. The proximal posterior face and the posterior face of the optic body form a continuous surface. An edge corner is formed by the intersection of the continuous surface with the optic edge, the side edge, and the step edge.
US 5476513A of Johnson and Johnson Surgical Vision Inc. filed with a priority date February 28, 1992 has disclosed an intraocular lens for implantation in an eye comprising an optic configured so that the optic can be deformed to permit the intraocular lens to be passed through an incision into the eye. A peripheral zone circumscribes the optical zone of the optic and one or more fixation members coupled to the peripheral zone and extending outwardly from the peripheral zone to retain the optic in the eye are provided. In one embodiment the fixation member or members are located so that the optical zone is free of such member or members. The peripheral zone preferably has a maximum axial thickness which is larger than the maximum axial thickness of the periphery of the optical zone.
In addition to above, Posterior capsule opacification (PCO) is the most common complication of cataract surgery. Posterior capsule opacification (PCO), often referred to as “secondary cataract,” is the most common postoperative complication of cataract extraction. In PCO, the posterior capsule undergoes secondary opacification due to the migration, proliferation, and differentiation of lens epithelial cells (LECs). PCO can cause significant visual symptoms, particularly when it involves the central visual axis. Despite advances in surgical techniques, intraocular lens (IOL) design, and development of therapeutic agents to inhibit PCO, this condition continues to impose a significant burden on patients and the health care system.
PCO occurs in 20-50% of patients within 2 to 5 years of cataract surgery. Although the incidence of PCO is reported to have declined in recent years, there is no definitive data, and the reported decrease may represent only a later onset of PCO. Children and infants have a significantly higher incidence and earlier onset of PCO, along with the potential for associated amblyopia. In children, reported rates of PCO reach 100%. Younger age is a significant risk factor for PCO. Other potential risk factors include the presence of conditions such as diabetes, uveitis, myopic dystrophy, retinitis pigmentosa, and traumatic cataract. Hence, it is highly desirable and need of an hour to provide novel or unique Intra-ocular lens that can reduce or prevent Posterior Capsule Opacification (PCO).
Based on the prior art analysis, it is evident that there is no system in prior arts which delivers oval shaped multi-focal Intra-ocular lens having L-shaped haptic members, providing largest visual field with minimal to nil positive dysphotopsia and nil negative dysphotopsia.
Advantageously, none of prior art systems are having outlook and surface profile like mono-focal Intra-ocular lens but multi-focal progressive in functionality having unique optical profile.
None of the prior arts have suggested or claimed Intra-ocular lens with a variable over all diameter proportionate to the axial length of eye ball, or inversely proportionate to the refractive status of patient's eye. Capsular bag diameter is bigger in long axial length eye balls and short in shorter axial length eye ball. So, one size-does-not-fit-all. All prior arts Intra ocular lens have only one fixed over all diameter. So, quite often it so happens that, an IOL is too big for small eyes, so it vaults in the bag; & IOL is too small for big eyes, so it freely rotates and may become off- centered in big diameter capsular bag. Our invention IOL design is such that, it has different and variable over-all diameter of the lens for different diopters, such that for every individual eye having different capsular bag size, and also with differing power of IOL, over-all diameter of the lens is to be made such, that the IOL snugly and perfectly fits into the capsular bag, without being too loose and rotating or decentering, or without being too tight fitment and causing forward or backward vaulting in the capsular bag.
All the prior arts IOLs are having either "J' shaped, "C" shaped, plate shaped or plate with four big holes type design of haptics. Plate haptics with or without four hole are very difficult and tedious to implant during surgery. "J" or "C" shaped haptics are comfortable and easy to implant, but they suffer from a major disadvantage that they have only a single small point of contact, usually less than a millimeter, in the fornix of capsular bag, hence they are prone to rotation and decentration.
None of the prior arts have suggested an "L" shaped haptic. Our invention having "L" shaped haptic with outer edge slightly frosted and roughened, has large contact of 6.5 mm area in the capsular bag, hence our invention IOL is most stable in the bag, and almost completely prevents rotation and decenteration. None of the prior arts have suggested Intra-ocular lens with an oval optic, of the size of 6.0 to 6.5 mm by 7.2 to 8.1 mm; with an anti-reflex surface; having much larger optic size compared to conventional Intra-ocular an oval optic, of the size of 6.0 to 6.5 mm by 7.2 to 8.1 mm; with an anti-reflex surface; having much larger optic size compared to conventional Intra-ocular lens. The said larger sized oval shaped anti-reflex optic helps in significantly reducing or eliminating positive dysphotopsia such as glare, halos, starbursts, visible rings; and also helps to eliminate negative dysphotopsia such as dark, grey or black crescent shaped hanging or floating shadows seen in the temporal visual field, providing the clearest and most natural human lens like vision to the eyes.
None of the prior arts have suggested Intra-ocular lens with higher Modulation Transfer Function (MTF) then the said present invention. Intra-ocular lens with higher Modulation Transfer Function (MTF) provides better, crisp and sharp vision with improved quantitative and qualitative vision, with almost natural human lens like clarity and contrast vision to the eyes.
OBJECTS OF THE PRESENT INVENTION
The main object of the present invention is to overcome the problems faced by the prior art references.
It is an object to provide oval shaped large size multi-focal and/or mono focal Intra-ocular lens having "L"-shaped haptic members, The said larger sized oval shaped anti-reflex optic, which helps in significantly reducing or eliminating positive dysphotopsia such as glare, halos, starbursts, visible rings; and also helps to eliminate negative dysphotopsia such as dark, grey or black crescent shaped hanging or floating shadows seen in the temporal visual field, providing the clearest and most natural human lens like vision to the eyes.
It is also an object to provide a unique Intra-ocular lens with unique optic surface profile, which is having outlook same as that of a mono focal Intra-ocular lens but which is a true multi-focal progressive lens in functionality.
It is also an object to provide Intra-ocular lens with large oval optic of size of 6.0 to 6.5 mm by 7.2 to 8.1 mm with an anti- reflex surface, having the largest optic size compared to conventional Intra-ocular lens which focuses an image on retina of the eye with field of view without the perception of visual artifacts & helps in significantly reducing or eliminating positive dysphotopsia such as glare, halos, starburst, visible rings and also eliminates negative dysphotopsia such as dark, grey or black crescent shaped hanging or floating shadows seen in the temporal peripheral visual field.
There is also an object to provide Intra-ocular lens with higher Modulation Transfer Function (MTF) that provides better crisp and sharp vision with improved quantitative and qualitative vision, with almost natural human lens like clarity and contrast vision to the eyes.
It is also an object to provide an oval shaped multi-focal intra-ocular lens having 360 degree true square or rectangle edge to prevent Proliferative Posterior Capsule Opacification (PCO or pPCO).
It is also an object to provide an oval shaped multi-focal intra-ocular lens, made up of very high bio-compatible material, so that prevents Fibrinous Posterior Capsule Opacification (PCO or fPCO). It is also an object to provide "L" shaped haptics, having capsular bag fornix contact surface of 6 to 6.5 mm by 0.25 to 0.35 mm, surface which is frosted and very gently and mildly roughened, such that immediate or late post-operative in-the-bag rotation of whole Intraocular lens, or optic of IOL is prevented.
It is also an object to provide different and variable over- all diameter of the lens for different diopters, such that for every individual eye having different diopteric power of IOL, so that the IOL snugly fits into the bag, without being too loose or too tight fitment in the capsular bag.
BRIEF DESCRIPTION OF DRAWINGS
Embodiments of the present invention may be better understood from the following detailed description when read in conjunction with the accompanying drawings. Such embodiments, which are for illustrative purpose only, depict novel and non-obvious aspects of the invention. Other arrangements of the invention are possible, and consequently the particularity of the accompanied drawings is not intended to be limiting of the present invention. The drawings include the following figures, with like numerals indicating like parts:
Figure- 1 is a Cross-sectional view, in the sagittal plane, through an anterior segment of a healthy human eye.
Figure-2 is a Front view of Oval shaped Intra-ocular lens as per the present invention.
Figure-2 (A) is a front view of Oval shaped Intra-ocular lens as per the present invention.
Figure-3 is a Side view of Oval shaped Intra-ocular lens as per the present invention.
Figure-4(A) is a view of Left eye visual field, only partially covered with Conventional Round Lens with C-shaped haptic showing, Aphakic visual field and the lens edge causing negative dysphotopsia. Figure-4(B) is a view of Left eye visual filed, fully covered with oval shaped optic Lens with L-shaped haptic.
DETAILED DESCRIPTION OF THE PRESENT INVENTION
The following descriptions of the embodiments are for exemplifying the principles and advantages of the inventions. They are not to be taken in any way as limitations on the scope of the inventions.
The Present invention relates to Oval Shaped Multifocal Intra-ocular lens (IOL) (1). More particularly, the present invention relates to Oval (2) shaped Multi-focal Intra-ocular lens (IOL) with L-shaped haptic members (3), which focuses an image on retina of the eye with field of view without the perception of visual artifacts & helps in significantly reducing or eliminating positive dysphotopsia such as glare, halos, starburst, visible rings and also eliminates negative dysphotopsia such as dark, grey or black crescent shaped hanging or floating shadows seen in the temporal peripheral visual field.
The uniqueness or Novelty of the present invention resides in the shape, configuration, size of the multi-focal intra-ocular lens (1) that makes the lens totally different from the conventional IOLs in terms of benefits, functionality & usages.
As illustrated in figures 2, 2(A) & 3, certain embodiments of an IOL (1) in accordance with the present invention are shown.
According to one embodiment, there is provided an oval (2) shaped Intra-ocular lens (1) for providing the clearest and most natural human lens like vision to the eyes, the Intra-ocular lens (1) comprises: an Oval (2) shaped optic size with an anti-reflex surface that focuses an image on retina of the eye with field of view without the perception of visual artifacts and helps in significantly reducing or eliminating positive dysphotopsia such as glare, halos, starburst, visible rings and also eliminates negative dysphotopsia such as dark, grey or black crescent shaped hanging or floating shadows seen in the temporal peripheral visual field; diametrically opposed L-shaped haptic members (3) having capsular bag fornix contact surface of 6 to 6.5 mm by 0.25 to 0.35 mm.
Oval (2) shaped multi-focal Intra-ocular lens (1) are provided with unique optical surface profile having outlook similar to mono-focal Intra-ocular lens (1) but is true multi-focal progressive in functionality.
According to another embodiment, there is provided Intra-ocular lens (1) with oval optic (2), of the size of 6.0 to 6.5 mm by 7.2 to 8.1 mm, with an anti-reflex surface having the largest optic size compared to conventional Intra-ocular lens, the said largest optic size helps in reducing or eliminating positive dysphotopsia such as glare, halos, starbursts, visible rings; and eliminates negative dysphotopsia such as dark, grey or black crescent shaped hanging or floating shadows seen in the temporal peripheral visual field, and provides clear and near natural vision to the eyes.
As an optical profile of Intra-ocular lens (1) is almost a mono-focal profile yet functions as multi-focal lens due to induction of refractive index gradient, it helps in reducing or almost eliminating positive dysphotopsia such as glare, halos, starbursts, visible rings.
Above statement can be proved by on optical bench tester in factory or in laboratory; on glare-halos-contrast sensitivity tester on clinical tester post-operative, also on OCT and fundus/retina imaging machine by comparing signal to noise ratio.
As shown in fig 2(A) & 3, Overall length of Intra-ocular lens (1) with L- shaped haptic members (3) is from 10.5 to 14.5 mm. Further, the thickness of haptic members (3) is in a range between 250 to 350 microns.
The length of lens (1) is selected as per the size of the patient’s eyes, the large oval (2) optical size eliminates negative dysphotopsia such as dark, grey or black crescent shaped hanging or floating shadows seen in the temporal peripheral visual field, and provides clear and near natural vision to the eyes”.
Absence of negative dysphotopsias (ND) is proved by optical ray tracing on computer simulated eye, in-vivo as well as in-silico.
The multi-focal Intra-ocular lens (1) of the present invention is provided with higher Modulation Transfer Function (MTF). Modulation Transfer Function (MDF) depends on the smoothness of optic surface of Intra ocular lens (1). The smoother the optic surface, higher is the Modulation Transfer Function (MTF), and the higher the MTF, better is the provided vision with improved quality, clarity and contrast to the eyes.
MTF function is measurable in lens (1) at manufacturing stage. Also it is possible to measure after implantation into eye by machines such as OPD-scan and iTrace. However, post-operative measurements are not benchmark or considered standard, because these measurements are affected by clarity and curvature of cornea and optical problems in vitreous and retina.
MTF can be tested on various Zernike profile wave front aberration meter machines like Rotlex IOLA+. This is measured for all lenses. ISO standard for MTF is "lowest 0.43 for far vision" wherein MTF for the Intra-ocular lens as per the present invention is kept in a range between 0.45 to 0.95, preferably between 0.5 to 0.90 for far vision which is much higher than the required MTF.
The said oval (2) shaped multi-focal intra-ocular lens (1) is having 360 degree sharp square or rectangle edges (4) in their shape (As shown in Figure-2 (A) & 3) and all round square edge (5), the said square edges (4) of the lens (1) overlap the periphery of the posterior portions of the eyes and help in preventing posterior capsule opacification (PCO) .
It is known that human eye-ball diameter is different for different diopters or vice versa, diameter of eye-ball decides the needed diopters hence it is also an object to provide different and variable over-all diameter of the lens for different diopters, such that for every individual eye having different diopteric power of IOL so that the IOL snugly fits into the bag, without being too loose or too tight fitment in the capsular bag. Optical power of lens is between 0 to +36 diopters.
Figure-4(A) is a view of Left eye visual field, only partially covered with Conventional Round Lens with C-shaped haptic showing, Aphakic visual field and the lens edge/border causing negative dysphotopsia.
Figure-4(B) shows a view of left eye visual field covered with Lens (1) with L-shaped haptic members (3) as per the present invention. According to the invention, IOL (1) with L-shaped haptic fits in the eyes in such a way so that it covers full visual field.
While comparing IOL (1) with L-shaped haptic members (3) of the present invention with conventional Lens with C-shaped haptic, IOL (1) covers full visual field while Conventional IOL do not cover full visual field of the eye, instead it covers partial visual field that creates Aphakic visual field and negative dysphotopsia for the eyes. This is due to smaller square or rectangle edges (4) of IOL and shape of optic used for IOL.
In the present invention, due to maximum square or rectangle edges (4) and all round square edges (5) of the lens, oval (2) shaped optic shape and L-Shaped haptic members (3) of the Lens (1), it makes possible to receive maximum or full visual field and further also does not create dark crescent shaped shadow on functional nasal retina within the visual field than the conventional Lens with C-shaped haptic.
Further, as per the present invention, oval (2) shaped IOL (1) with L- shaped haptic members (3) & desired square or rectangle edges (4) covers large horizontal visual field which helps in avoiding negative dysphotopsia while fixing the Lens with a minimum 6.0 mm arc length contact area at capsular bag fornix provides large area of friction which provides better rotational stability within the eyes. While in conventional IOL, due to their lesser square or rectangle edges, it provides lesser than needed horizontal visual field and creates negative dysphotopsia in many cases. In case of conventional IOL, only a tip of C-shaped haptic is in touch of capsular bag fornix and so creates less area of friction which provides lesser rotational stability than the IOL of the present invention.
The Oval (2) shaped multi-focal intra-ocular lens (1) comprises a transparent structure constructed from a polymeric, silicone, acrylic, or other suitable moldable material having a refractive index similar to the natural native lens 24 (FIG. 1).
The L-shaped haptic members (3) may be constructed from a soft material such as hydrophobic polymer, hydrophilic polymer, copolymer of hydrophobic-hydrophilic polymer, extruded poly-methyl methacrylate (“PMMA”), polypropylene, silicone, or acrylic other than the IOL optic in case of a three-piece IOL; or it may be formed from the same material as of optic body of IOL in case of single-piece IOL. The soft material allows the haptic members to be folded for insertion through the capsulorhexis edge and deployment within the capsular bag.
An Oval (2) shaped Intra-ocular lens (1) can be made using a convention methods for example: (A) Either a button of proper and chosen biocompatible polymer plastic or silicon material is lathed and then milled to a shape of intraocular lens, which is known as lathe-mill- punch-cut technique OR (B) intra-ocular lens is made by pouring liquid polymer into a mold and allowing it to be solidified into a lens - which is known as injection molding technique. Contact surface of L-shaped haptic members (3) of Intra-ocular lens (1) are frosted and very gently and mildly roughened such that immediate or late post- operative in-the- bag rotation of whole Intraocular lens (1), or optic of Intra-ocular lens is prevented. The said Intra-ocular lens (1) can be inserted with the techniques known in prior art, insertion of lens can be done by holding and folding forceps or by lens injector and cartridge or from small or big scleral or corneal incision.
ADVANTAGES OF THE PRESENT INVENTION
The following is a non-exhaustive list of advantages for the system disclosed in the present invention. Some of the features of the advantages of the present invention which are not disclosed in the present provisional application shall be disclosed with full description at the time of filing the Complete Specification.
1. An Intra-ocular lens with oval optic, of size of 6.0 to 6.5 mm by 7.2 to 8.1 mm, with an anti-reflex surface, having the largest optic size compared to all conventional Intra-ocular lens, the said largest optic size helps in reducing or eliminating positive dysphotopsia such as glare, halos, starbursts, visible rings; and eliminates negative dysphotopsia such as dark, grey or black crescent shaped hanging or floating shadows seen in the temporal peripheral visual field, and provides clear and near natural vision to the eyes.
2. Intra-ocular lens with unique optic body surface profile having outlook similar to mono-focal Intra-ocular lens but true multi-focal progressive in functionality.
3. Oval shaped multi-focal intra-ocular lens having 360 degree true square or rectangle edges; which helps to prevent posterior capsule opacification (PCO).
4. L-shaped haptic members of intra-ocular lens help the said lens in fixing appropriately and permanently, preventing rotation or decentration in the capsular bag.
5. Intra-ocular lens with higher Modulation Transfer Function (MTF) that provides better vision, quality, clarity and contrast to the eyes.

Claims

We Claim:
1. An oval (2) shaped Intra-ocular lens (1) for providing the clearest and most natural human lens like vision to the eyes, the Intra-ocular lens (1) comprises: an Oval (2) shaped optic size between 6.0 to 6.5 mm by 7.2 to 8.1 mm with an anti-reflex surface that focuses an image on retina of the eye with field of view without the perception of visual artifacts and helps in significantly reducing or eliminating positive dysphotopsia such as glare, halos, starburst, visible rings and also eliminates negative dysphotopsia such as dark, grey or black crescent shaped hanging or floating shadows seen in the temporal peripheral visual field; diametrically opposed L- shaped haptic members (3) having capsular bag fornix contact surface of 6 to 6.5 mm by 0.25 to 0.35 mm.
2. An oval (2) shaped Intra-ocular lens (1) as claimed in claim- 1 wherein optic surface profile of Intra-ocular lens (1) having same outlook as that of a mono-focal Intra-ocular lens but functions like a multi-focal progressive lens.
3. An oval (2) shaped Intra-ocular lens (1) as claimed in claim- 1 wherein an oval (2) shaped intra-ocular lens having 360 degree edges (4) with all around square edge (5) to prevent Proliferative Posterior Capsule Opacification (PCO or pPCO) .
4. An oval (2) shaped Intra-ocular lens (1) as claimed in claim-3 wherein 360 degree edges (4) is either square or rectangle, the said edges of the lens overlap the periphery of the posterior capsule of the eyes and help in preventing Proliferative Posterior Capsule Opacification (PCO or pPCO) .
5. An oval (2) shaped Intra-ocular lens (1) as claimed in claim- 1 wherein an oval shaped optic of Intra-ocular lens is made up of very high bio- compatible material to prevent Fibrinous Posterior Capsule Opacification (PCO or fPCO).
6. An oval (2) shaped Intra-ocular lens (1) as claimed in claim-5 wherein bio-compatible material is selected from a polymeric, silicone, acrylic, or other suitable moldable optic material.
7. An oval (2) shaped Intra-ocular lens (1) as claimed in claim- 1 wherein L- shaped haptic members (3) is made from hydrophobic polymer, hydrophilic polymer, copolymer of hydrophobic-hydrophilic polymer, extruded poly methyl methacrylate (“PMMA”), polypropylene, silicone, or acrylic.
8. An oval (2) shaped Intra-ocular lens (1) as claimed in claim- 1 wherein contact surface of L-shaped haptic members (3) of Intra-ocular lens (1) are frosted and very gently and mildly roughened such that immediate or late post-operative in-the-bag rotation of whole Intraocular lens (1), or optic of Intra-ocular lens is prevented.
9. An oval (2) shaped Intra-ocular lens (1) as claimed in claim- 1 wherein an oval shaped Intra-ocular lens is a single-piece or three-piece Intra-ocular lens (1).
10. An oval (2) shaped Intra-ocular lens (1) as claimed in claim- 1 wherein L-shaped haptic members (3) are constructed from material selected from hydrophobic polymer, hydrophilic polymer, copolymer of hydrophobic- hydrophilic polymer, extruded poly-methyl methacrylate (“PMMA”), polypropylene, silicone, or acrylic.
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EP0709069A1 (en) * 1994-10-31 1996-05-01 Pharmacia AB Intraocular lens having haptics with non-symmetrical crosssection
FR3072020B1 (en) * 2017-10-05 2019-11-08 Cristalens Industrie ASSEMBLY CONSISTING OF A PAIR OF MULTIFOCAL OCULAR IMPLANTS

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JPS6099246A (en) * 1983-10-07 1985-06-03 ク−パ−ビジヨン　インコ−ポレイテツド Intraoccular lens
EP0709069A1 (en) * 1994-10-31 1996-05-01 Pharmacia AB Intraocular lens having haptics with non-symmetrical crosssection
FR3072020B1 (en) * 2017-10-05 2019-11-08 Cristalens Industrie ASSEMBLY CONSISTING OF A PAIR OF MULTIFOCAL OCULAR IMPLANTS

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