WO2001095842A1 - Lentille aspherique de traitement par iridectomie/iridotomie - Google Patents
Lentille aspherique de traitement par iridectomie/iridotomie Download PDFInfo
- Publication number
- WO2001095842A1 WO2001095842A1 PCT/US2001/019445 US0119445W WO0195842A1 WO 2001095842 A1 WO2001095842 A1 WO 2001095842A1 US 0119445 W US0119445 W US 0119445W WO 0195842 A1 WO0195842 A1 WO 0195842A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- iridectomy
- iridotomy
- lens
- lens according
- eye
- Prior art date
Links
Classifications
-
- 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
- A61F9/00—Methods or devices for treatment of the eyes; Devices for putting-in contact lenses; Devices to correct squinting; Apparatus to guide the blind; Protective devices for the eyes, carried on the body or in the hand
- A61F9/007—Methods or devices for eye surgery
- A61F9/008—Methods or devices for eye surgery using laser
- A61F9/009—Auxiliary devices making contact with the eyeball and coupling in laser light, e.g. goniolenses
-
- 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
- A61F9/00—Methods or devices for treatment of the eyes; Devices for putting-in contact lenses; Devices to correct squinting; Apparatus to guide the blind; Protective devices for the eyes, carried on the body or in the hand
- A61F9/007—Methods or devices for eye surgery
- A61F9/008—Methods or devices for eye surgery using laser
- A61F2009/00861—Methods or devices for eye surgery using laser adapted for treatment at a particular location
- A61F2009/00876—Iris
-
- 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
- A61F9/00—Methods or devices for treatment of the eyes; Devices for putting-in contact lenses; Devices to correct squinting; Apparatus to guide the blind; Protective devices for the eyes, carried on the body or in the hand
- A61F9/007—Methods or devices for eye surgery
- A61F9/008—Methods or devices for eye surgery using laser
- A61F2009/00885—Methods or devices for eye surgery using laser for treating a particular disease
- A61F2009/00891—Glaucoma
-
- 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
- A61F9/00—Methods or devices for treatment of the eyes; Devices for putting-in contact lenses; Devices to correct squinting; Apparatus to guide the blind; Protective devices for the eyes, carried on the body or in the hand
- A61F9/007—Methods or devices for eye surgery
- A61F9/00781—Apparatus for modifying intraocular pressure, e.g. for glaucoma treatment
Definitions
- the invention relates to a direct ophthalmoscopy lens device, of the contact type, and specifically a contact iridectomy/iridotomy lens for diagnosis and laser treatment of the iris of a patient's eye in conjunction with a slit-lamp or other biomicroscope.
- iridectomy/iridotomy lenses have been used for the treatment of the eye disease glaucoma by creating iridian drainage holes.
- the ciliary process of the eye produces the aqueous humor, which flows up tlirough the pupil into the anterior chamber. From there, the aqueous humor drains into the trabecular meshwork, into the Canal of Schlem then into the veneous drainage system of the body.
- Eye diseases such as glaucoma inhibit the free circulation of aqueous humor to the anterior chamber of the eye. When the trabecular meshwork becomes clogged, it does not allow the aqueous humor to drain. This causes the entire eye to experience pressure on the sensitive retina and optic nerve, damaging the nerve fiber.
- a second type of glaucoma is called acute angle-closure glaucoma.
- the lens of the eye becomes too concave on both surfaces and blocks the drainage angle in the anterior chamber. This effect is a true emergency and, while medicines can lower the eye pressure, treatment must occur.
- One method of treating glaucoma is to make a small precise hole in the iris to allow the aqueous humor to drain from the anterior chamber, even when the pupil rests against the lens which ultimately reduces the pressure of the eye.
- Iridectomy/iridotomy lenses are used for this treatment.
- the known Abraham Iridectomy Lens for example, uses an 8.0 mm diameter, 66 diopter glass button cemented to a piano surface. Although this lens performs adequately in its purpose of imaging and converging the laser on the iris, it has a limited field of view.
- Another such iridectomy style lens is disclosed, for example, in U.S. Patent No. 4,750,829 to James B. Wise, incorporated herein by reference.
- This device utilizes an off center axis 103 diopter button to increase the energy density.
- This device create a 2.65x image magnification, and the power density created by the laser beam convergence on the iris from this device is extremely powerful for creating iridian drainage holes.
- this device utilizes spherical optics and has limited image quality.
- an iridectomy/iridotomy lens system for at least one of observing and treating an eye, comprising: an integral, one-piece contact lens body having a concave posterior surface and a convex anterior surface, wherein the posterior concave surface has a curvature corresponding to a curvature of an average cornea and a central axis that is substantially coincident with the central optical axis of the eye when centrally located on the cornea of the eye, and the convex anterior surface is less steeply curved than the concave posterior surface and has a central axis that is offset from the central axis of the concave posterior surface by a sufficient distance for creating a focal point on the iris of the eye.
- the above construction of the lens body creates a magnified virtual image behind the iris inside the patient's eye.
- the edge- to-edge diameter of the convex surface can be significantly larger than the anterior button lens of the known iridectomy lenses.
- the invention enables a larger field of view as compared to the known iridectomy lenses where, in order for the convex surface of the offset and steeply curved surface of the attached button lens to be contained with the same region as the posterior concave surface, the edge-to edge diameter of the button lens must be significantly less than the diameter of the concave posterior surface.
- the convex anterior surface is aspheric for improved optical properties of the lens, such as improved resolution, imaging, laser convergence, stereopsis and decreased aberrations.
- the concave posterior surface also is aspheric. The applicant herein has discovered that by using an aspheric concave posterior surface and a larger diameter aspheric convex anterior surface with a determined lens center thickness and correspondingly chosen conic constants for the aspheric surfaces, it is possible to provide a large field of view together with a highly detailed image magnification, resolution, and laser energy convergence for creating iridian holes.
- the conic constants are determined by the thickness of the lens between the posterior concave and anterior convex surfaces.
- This invention comprehends a series of lenses having a range of center thickness and, as a result, a corresponding range of conic constants, image magnifications, laser spot sizes, and lens powers.
- 66 diopter Abraham Iridectomy Lens which uses spherical optics, the field of view, detailed imaging, and laser convergence or spot creation provided by the present invention are greatly enhanced.
- the use of aspheric optics in the present invention improve image quality, stereopsis, resolution, and correction for aberrations to an extent not possible with the spherical optics of the known iridectomy/iridotomy lenses.
- the new invention utilizing aspheric optics, provides superior imaging optics, stereopsis, resolution, and laser beam convergence as well as a larger field of view.
- the concave surface has an apical radius of 7.65, conic constant -0.18, and diameter (edge-to-edge) of 12.7 mm while the convex surface has an off-set diameter (edge- to-edge) of 11.6 mm, a apical radius of 7.91 mm, conic constant of -0.18, and a center thickness of 6.86 mm, with the center axis of the convex anterior surface being off-set by 2.5 mm from the center axis of the concave posterior surface.
- This lens design produces a power of 38.97 diopters, an iridian image magnification of 1.70x and a 0.66x laser spot magnification factor at the iris.
- the image magnification, laser spot, and lens diopter power changes accordingly.
- image magnification will range between about 1.47 and 2.20 and laser spot size reduced to between about 0.53x and 0.779x and a diopter power range between 31.0 and 46.0.
- the concave surface has an apical radius of between about 7.55 mm and 7.75 mm; a conic constant of between about -0.01 and -0.20 and a diameter (edge-to-edge) between about 12.0 mm and 13.0 mm.
- the convex surface has an apical radius between about 7.0 mm and 8.0 mm; a conic constant between about -0.020 and 0.226 and a diameter (edge-to-edge) between about 10.0 mm and 12.0 mm.
- the center thickness will be in a range between about 4.5 mm and 9.5 mm and the off-set distance between the center axes of the posterior and anterior curved surfaces will be in a range between about 2.0 mm and 3.0 mm.
- FIG. 1 shows a cross section of a direct, contact ophthalmoscopy lens device according to the invention with an overlaid ray.
- FIG. 2 shows a plan lens view of the embodiment of Fig. 1 and shows, in dotted lines, by comparison, a standard 8.0 mm diameter button lens of an Abraham Iridectomy Lens.
- FIG. 1 shows a lens layout of one embodiment of a direct, contact ophthalmoscopy lens device according to the invention that includes an integral, one piece lens body L with a posterior concave surface 1, an anterior piano portion 2 and an anterior convex surface 3.
- the lens L can be fixed in a common shaped frame or housing (not shown) as known in the art.
- Posterior lens surface 1 has a concave surface that has a curvature generally corresponding to the curvature of an average cornea for placement in contact with a patient's eye.
- Concave posterior surface 1 has a central axis Ai that corresponds with the central axis CL of a patient's eye when centrally located thereon.
- Convex anterior surface 3 is less steeply curved than concave posterior surface 1.
- Anterior surface 3 has an optical axis A 2 offset from the central optical axis Ai of concave posterior surface 1.
- Piano anterior portion 2 results from the offset of optical axes Ai and A 2 .
- the lens body may be made of PMMA (polymethyhnethacrylate) acrylic which has an index of refraction of 1.491. However, preferred embodiments are not limited to any particular optical material or refractive index.
- the following Table summarizes characteristics of the lens surfaces and their relative spacing according to exemplary implementations of the invention.
- the "Radius” in the table and as used throughout is the apical radius of curvature.
- a radius of "Infinity” represents a flat surface.
- the “Distance from Corneal Apex” is the distance from a surface or, in the case of a curved surface, the distance from the apex of that curved surface to the corneal apex. The distance is measured along a line perpendicular to the tanget of the corneal apex.
- the distance from the posterior concave surface to the corneal apex is understood to be 0, since, when the lens is in place on an eye this distance is 0 or close thereto.
- a “Conic Constant” of 0 indicates a spherical surface and a non-zero conic constant indicates an aspheric conoid.
- the "Diameter” is the distance between the outer edges of the respective lens
- the “Design Number” relates to the specific design where surface 1 and 2 remain constant and the surface 3 center thickness and conic constant is varied, per the design number, resulting in specific lens attributes.
- the "Image Distance From Corneal Apex” is the distance the image is produced from the corneal apex or, equivalently, the apex of the posterior concave surface under conditions where the two apexes are essentially coincident. A negative sign for this distance means the image is behind the cornea inside the eye.
- the resulting “hnage magnification,” “Diopter Power,” “Laser Spot Size,” and “Image Distance From Corneal Apex” are the lens design attributes produced by surface 3 having a specific radius and conic constant and located at the respectively indicated distances from surface 1. TABLE I
- light rays which originate at the patient's iris, pass through the cornea, exit the eye and pass through the lens device in accordance with the ray tracing which overlays the lens layout in FIG. 1.
- the iris location in air is represented in FIG. 1 as the line labeled "Iris.”
- light rays exiting the eye will be refracted at surfaces 1 and 3 and to form a virtual image at plane I behind the iris.
- Lenses made according to the respective Design Numbers 1-12 in the above Table will produce a virtual image at a location 1.62 to 4.19 mm behind the corneal apex.
- Figure 2 shows a top view of the lens in Figure 1.
- Figure 2 additionally shows in dashed line the approximate optical viewing area that would be available with the known iridectomy/iridotomy lens employing a steeply curved, smaller diameter anterior button lens 4.
- the cross-hatched region represents the increased optical viewing area that is provided by the iridectomy/iridotomy lens of the invention compared to prior art iridectomy/iridotomy lenses.
- the present invention provides approximately twice the viewing area provided by the known iridectomy/iridotomy lenses, and a correspondingly larger field of view.
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- Health & Medical Sciences (AREA)
- Ophthalmology & Optometry (AREA)
- Optics & Photonics (AREA)
- Physics & Mathematics (AREA)
- Heart & Thoracic Surgery (AREA)
- Surgery (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Vascular Medicine (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Eyeglasses (AREA)
Abstract
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2001271325A AU2001271325A1 (en) | 2000-06-16 | 2001-06-18 | Aspheric iridectomy/iridotomy treatment lens |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US59544000A | 2000-06-16 | 2000-06-16 | |
US09/595,440 | 2000-06-16 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001095842A1 true WO2001095842A1 (fr) | 2001-12-20 |
Family
ID=24383232
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2001/019445 WO2001095842A1 (fr) | 2000-06-16 | 2001-06-18 | Lentille aspherique de traitement par iridectomie/iridotomie |
Country Status (2)
Country | Link |
---|---|
AU (1) | AU2001271325A1 (fr) |
WO (1) | WO2001095842A1 (fr) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1844744A1 (fr) * | 2006-04-11 | 2007-10-17 | WaveLight AG | Dispositif laser pour la chirurgie ophtalmique |
EP1889566A1 (fr) * | 2006-08-18 | 2008-02-20 | Ocular Instruments, Inc. | Gonioscope de vue directe |
US10898381B2 (en) | 2003-06-02 | 2021-01-26 | Carl Zeiss Meditec Ag | Method and apparatus for precision working of material |
EP3937867A4 (fr) * | 2019-03-13 | 2022-12-07 | Belkin Vision Ltd. | Iridotomie laser automatisée |
US11564836B2 (en) | 2010-05-10 | 2023-01-31 | Ramot At Tel Aviv University Ltd. | System and method for treating an eye |
US11771596B2 (en) | 2010-05-10 | 2023-10-03 | Ramot At Tel-Aviv University Ltd. | System and method for treating an eye |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4506962A (en) * | 1981-02-12 | 1985-03-26 | Lasag Ag | Contact lens for observation or irradiation of the eye |
US4598984A (en) * | 1984-01-30 | 1986-07-08 | Lasag Ag | Contact lens arrangement for optically examining an eye and treating it by light irradiation |
US4750829A (en) | 1986-05-09 | 1988-06-14 | Wise James B | Iridotomy-sphincterotomy contact lens |
US4907872A (en) * | 1987-06-03 | 1990-03-13 | G. Rodenstock Instrumente Gmbh | Contact lens for enabling treatment of the eye by laser |
DE3909034A1 (de) * | 1989-03-18 | 1990-09-27 | Moeller J D Optik | Optisches system zur beobachtung des augeninneren und ein ophthalmologisches kontaktglas hierfuer |
US5788957A (en) * | 1991-10-15 | 1998-08-04 | Advanced Corneal Systems, Inc. | Enzyme-orthokeratology |
-
2001
- 2001-06-18 AU AU2001271325A patent/AU2001271325A1/en not_active Abandoned
- 2001-06-18 WO PCT/US2001/019445 patent/WO2001095842A1/fr active Application Filing
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4506962A (en) * | 1981-02-12 | 1985-03-26 | Lasag Ag | Contact lens for observation or irradiation of the eye |
US4598984A (en) * | 1984-01-30 | 1986-07-08 | Lasag Ag | Contact lens arrangement for optically examining an eye and treating it by light irradiation |
US4750829A (en) | 1986-05-09 | 1988-06-14 | Wise James B | Iridotomy-sphincterotomy contact lens |
US4907872A (en) * | 1987-06-03 | 1990-03-13 | G. Rodenstock Instrumente Gmbh | Contact lens for enabling treatment of the eye by laser |
DE3909034A1 (de) * | 1989-03-18 | 1990-09-27 | Moeller J D Optik | Optisches system zur beobachtung des augeninneren und ein ophthalmologisches kontaktglas hierfuer |
US5788957A (en) * | 1991-10-15 | 1998-08-04 | Advanced Corneal Systems, Inc. | Enzyme-orthokeratology |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10898381B2 (en) | 2003-06-02 | 2021-01-26 | Carl Zeiss Meditec Ag | Method and apparatus for precision working of material |
EP2805697B1 (fr) | 2003-06-02 | 2021-05-05 | Carl Zeiss Meditec AG | Dispositif de traitement précis d'un materiau |
EP1844744A1 (fr) * | 2006-04-11 | 2007-10-17 | WaveLight AG | Dispositif laser pour la chirurgie ophtalmique |
EP1889566A1 (fr) * | 2006-08-18 | 2008-02-20 | Ocular Instruments, Inc. | Gonioscope de vue directe |
US7419262B2 (en) | 2006-08-18 | 2008-09-02 | Ocular Instruments, Inc. | Direct view gonio lens |
US11564836B2 (en) | 2010-05-10 | 2023-01-31 | Ramot At Tel Aviv University Ltd. | System and method for treating an eye |
US11771596B2 (en) | 2010-05-10 | 2023-10-03 | Ramot At Tel-Aviv University Ltd. | System and method for treating an eye |
EP3937867A4 (fr) * | 2019-03-13 | 2022-12-07 | Belkin Vision Ltd. | Iridotomie laser automatisée |
Also Published As
Publication number | Publication date |
---|---|
AU2001271325A1 (en) | 2001-12-24 |
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