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WO1998053360A1 - Lentilles de contact bifocales excentrees - Google Patents

Lentilles de contact bifocales excentrees Download PDF

Info

Publication number
WO1998053360A1
WO1998053360A1 PCT/GB1998/001466 GB9801466W WO9853360A1 WO 1998053360 A1 WO1998053360 A1 WO 1998053360A1 GB 9801466 W GB9801466 W GB 9801466W WO 9853360 A1 WO9853360 A1 WO 9853360A1
Authority
WO
WIPO (PCT)
Prior art keywords
lens
zone
vision
contact lens
distance
Prior art date
Application number
PCT/GB1998/001466
Other languages
English (en)
Inventor
John Trevor De Carle
Original Assignee
Aspect Vision Care Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Aspect Vision Care Ltd. filed Critical Aspect Vision Care Ltd.
Publication of WO1998053360A1 publication Critical patent/WO1998053360A1/fr

Links

Classifications

    • 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
    • G02C7/04—Contact lenses for the eyes
    • G02C7/048—Means for stabilising the orientation of lenses in the eye
    • 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
    • G02C7/04—Contact lenses for the eyes
    • G02C7/041—Contact lenses for the eyes bifocal; multifocal
    • G02C7/042—Simultaneous type
    • 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
    • G02C7/04—Contact lenses for the eyes
    • G02C7/041—Contact lenses for the eyes bifocal; multifocal
    • G02C7/043—Translating type
    • 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
    • G02C7/04—Contact lenses for the eyes
    • G02C7/041—Contact lenses for the eyes bifocal; multifocal
    • G02C7/044—Annular configuration, e.g. pupil tuned
    • G—PHYSICS
    • G02—OPTICS
    • G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
    • G02C2202/00—Generic optical aspects applicable to one or more of the subgroups of G02C7/00
    • G02C2202/04—Lenses comprising decentered structures
    • G—PHYSICS
    • G02—OPTICS
    • G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
    • G02C2202/00—Generic optical aspects applicable to one or more of the subgroups of G02C7/00
    • G02C2202/20—Diffractive and Fresnel lenses or lens portions

Definitions

  • This invention relates to multifocal contact lenses, and in particular to bifocal contact lenses.
  • the present invention is based on that observation that when a bifocal contact lens is displaced nasally in an average person, the vision, especially the distance vision, improves.
  • a multifocal contact lens which comprises a generally circular first vision zone intended for distance or near vision and an annular second vision zone surrounding said first vision zone and intended for the other of near or distance vision, wherein in use the optical axis of the first zone is displaced nasally with respect to the geometric axis of the lens.
  • the first circular vision zone is a distance vision zone and the adjacent annular surrounding zone is a near vision zone.
  • a more complex lens may include further annular zones surrounding the first annular zone and these zones may be alternately distance and near vision zones.
  • multi-focal lenses may be constructed by providing a multipUcity of zones which cover three or more focal lengths. Because it is important that the optical axis of at least the inner vision zone of the lens is displaced or decentered nasally, the lenses of this invention will normally incorporate some kind of retaining means which will ensure the desired orientation on the lens.
  • a 'slab off technique This method is conventionally used for ensuring the correct orientation of toric lenses.
  • the lens is thinned at the top and bottom, e.g. by machining or polishing over arcuate portions of the lens.
  • the lens can be truncated at the bottom to cause the lens to sit with the truncated portion downwardly. This technique can be combined with a prism.
  • the lens may be manufactured with a thicker area in the lower part of the lens. Although lenses of this shape are difficult to produce on a lathe, it becomes the preferred system if the lens is moulded.
  • Lenses of the present invention may operate by refraction and/or diffraction, although lenses which operate at least partly by refraction are preferred. Diffraction is conveniently employed to apply a plus correction for near vision to a lens in which the distance vision is corrected by the power curve of the lens.
  • An example of such a lens and a method of manufacture is described in US Patent No. 4637697, the disclosure of which is specifically incorporated herein by reference.
  • Figure 1 is a plan view of a bifocal lens in accordance with the invention
  • Figure 2 is a cross-section on the line X-X in Figure 1
  • Figure 3 is a cross-section on the line Y-Y in Figure 1
  • Figure 4 is a plan view of a second embodiment of a bifocal lens in accordance with the invention.
  • the lens has a base curve 1 cut to a profile which corresponds to the patient's cornea and a power curve 2 which determines the optical power of the lens.
  • the power curve is machined with a central circular area 3 which forms one vision zone having a first power and an annular surrounding area 4 which forms a different vision zone having a second power.
  • zone 3 has a power appropriate for distance vision and zone 4 a power suitable for near vision. Differences in power are attained by the relative steepness of the portions of the power curve forming the zones.
  • the base curve may be shaped to provide the differences in power or contribute to the differences in power of the two vision zones.
  • the point P represents the point through which the geometric axis A-A passes.
  • P represents the geometric centre of the lens.
  • Zone 3 is displaced or decentered to one side of the lens so that when the lens is worn, its optical axis B-B passing through point O is displaced nasally when the lens is centered geometrically on the cornea.
  • the optimum degree of displacement d varies with patients but is normally in the range of 0.5 to 1.5 mm, e.g. about 1 mm.
  • the lens is formed with a thicker portion 6.
  • This thicker portion tends to retain the lens on the cornea in the orientation shown in Figure 1 and preferably also acts to return the lens to this orientation if it becomes rotationally displaced during wearing.
  • Figure 4 shows a bifocal lens which is the same in most respects as the lens shown in Figures 1 to 3. The embodiment of Figure 4 differs from the first embodiment only in the retaining means for maintaining the lens on the eye in the desired orientation.
  • the lower segment 10 is formed with two thickened portions 11. These thickened portions are spaced from the line Y-Y so that when the wearer is looking through the lower part of the near vision portion, his vision will not be disturbed by a thickened portion which is present to maintain the correct orientation of the lens.
  • the lenses of the invention will move on the cornea as the wearer changes his viewpoint between distance and near vision.
  • the near vision correction is provided by the peripheral region or zone 4
  • when the wearer looks down to read the lower lid will tend to push the lens up so that a larger proportion of light will enter the cornea from the near vision zone, than from the distance vision zone.
  • large amounts of movement of the lens on the cornea tend to upset some contact lens wearers and in the lenses of this invention it is unnecessary for the wearer to be looking exclusively through one type of zone, rather than the other, to achieve good near and distance vision corrections. Good results are obtained where the wearer looks through both zones at the same time, and he will quickly learn to discriminate between the two images since one will be in sharper focus.
  • a small amount of movement can be helpful, particularly where the cornea receives more light or a greater light intensity through the zone appropriate for the vision required at that point. For example, where the wearer switches from distance to near vision, upward movement of the lower eyelid may raise the lens by a small amount, which then causes more light to enter the eye through the near vision zone.
  • the surface contours making up the Fresnel zone plate can be shaped so that the step height is different in one region of the lens from another.
  • the intensity of light associated with an image seen by diffraction at one order in that region of the lens is greater than the light intensity of the same image, when seen at the same order through other regions of the lens.
  • the lens surface in the concentric outer region 2 may be formed with zone plate rings having a height such that the intensity of Ught in, say, the zero order diffraction, has a higher intensity than the intensity of Ught diffracted by the central region of the lens.
  • the distance vision may be provided by refraction produced by the power surface of the lens and near vision by the zone plate rings.
  • Lenses in accordance with the invention are most conveniently manufactured by moulding. However, they may also be manufactured by machining, poUshing or laser ablation.
  • a decentered lens in accordance with the invention may, for example, be cut on a high precision lathe to an overaU diameter greater than required, and then cropped to the desired size in such a way that the optical axis of the central region is decentered by the desired amount.
  • lenses in accordance with the invention are manufactured by moulding. This is done by machining a metal mould insert with a high precision computer-controlled lathe, such as a Rank Optoform 50 lathe (available from Taylor, Hobson Pneumo of 2 Star Road, Sheffield LE4 9JQ, England. Such a lathe is N.C. controUed and can be digitally programmed to shape the surface of the insert by using a variety of cutting tools, whose position with respect to the work piece is determined by control means which define the position of the tools in relation to X, Y and Z axes. Unlike conventional lathes, the tools are not mounted on radius arms and it is possible to readily cut aspherical surfaces.
  • a high precision computer-controlled lathe such as a Rank Optoform 50 lathe (available from Taylor, Hobson Pneumo of 2 Star Road, Sheffield LE4 9JQ, England.
  • a lathe is N.C. controUed and can be digitally programmed to shape the surface of the insert by
  • the shaped metal insert is then used to mould a plastic, e.g. a polypropylene mould, from which the lens if formed by casting, curing and, if water-sweUable, by swelling in saline.
  • a plastic e.g. a polypropylene mould
  • the shaping of the metal insert is carried out in such a way that there is no sharp transition between the near and distance vision zones but instead a continuous variation in curvature.
  • Lenses in accordance with the invention are preferably of the so-called concentric type in which there is a central area surrounded by one or more peripheral areas, it wiU be appreciated that for the purposes of this invention, the peripheral and central areas will not be strictly concentric. Bifocal lenses of this kind are described, for example, in US Patent No. 4890913 and UK Patent No. 2295686, the disclosure of which is specificaUy incorporated herein by reference.
  • the lens construction will fall into the following types and aU are included in the present invention.
  • an alternative system is to provide one lens with distance vision in the centre and near vision in a peripheral area, whUe the lens on the other eye has the near and distance vision areas reversed.
  • Lenses in accordance with the invention may be 'soft', especiaUy hydrophiUc soft contact lenses manufactured from polymers such as those described in British patents Nos. 1385677, 1475605 and 1436705.
  • the polymer is produced in a non- hydrated condition (known as a xerogel) and shaped in this form to provide the power and base curves and the nasaUy decentered zone. After shaping, the lens is hydrated by swelling in isotonic saline to form the final lens.
  • the lens may be manufactured from hard polymer material, e.g. hard, gas-permeable polymer.

Landscapes

  • Health & Medical Sciences (AREA)
  • Ophthalmology & Optometry (AREA)
  • Physics & Mathematics (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Eyeglasses (AREA)

Abstract

L'invention concerne des lentilles de contact multifocales présentant une première zone circulaire (3), correspondant à une vision rapprochée ou à distance, et une seconde zone annulaire (4), entourant la première, et correspondant à la vision rapprochée ou à distance complémentaire. L'axe optique B-B de la lentille est décalé par rapport à l'axe géométrique A-A de telle manière qu'en cours d'utilisation, la lentille soit excentrée par rapport au nez.
PCT/GB1998/001466 1997-05-23 1998-05-21 Lentilles de contact bifocales excentrees WO1998053360A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9710781.7A GB9710781D0 (en) 1997-05-23 1997-05-23 Decentred bifocal contact lenses
GB9710781.7 1997-05-23

Publications (1)

Publication Number Publication Date
WO1998053360A1 true WO1998053360A1 (fr) 1998-11-26

Family

ID=10813028

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1998/001466 WO1998053360A1 (fr) 1997-05-23 1998-05-21 Lentilles de contact bifocales excentrees

Country Status (2)

Country Link
GB (2) GB9710781D0 (fr)
WO (1) WO1998053360A1 (fr)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6682195B2 (en) 2001-10-25 2004-01-27 Ophthonix, Inc. Custom eyeglass manufacturing method
US6712466B2 (en) 2001-10-25 2004-03-30 Ophthonix, Inc. Eyeglass manufacturing method using variable index layer
US6813082B2 (en) 2000-11-27 2004-11-02 Ophthonix, Inc. Wavefront aberrator and method of manufacturing
US7217375B2 (en) 2001-06-04 2007-05-15 Ophthonix, Inc. Apparatus and method of fabricating a compensating element for wavefront correction using spatially localized curing of resin mixtures
US7293871B2 (en) 2000-11-27 2007-11-13 Ophthonix, Inc. Apparatus and method of correcting higher-order aberrations of the human eye
US7434931B2 (en) 2001-10-25 2008-10-14 Ophthonix Custom eyeglass manufacturing method
US7524059B2 (en) 1999-07-02 2009-04-28 E-Vision, Llc System, apparatus and method for correcting vision with an adaptive optic
WO2012044534A1 (fr) * 2010-09-27 2012-04-05 Johnson & Johnson Vision Care. Inc. Lentille de contact presbytique à translation
WO2012047549A1 (fr) * 2010-09-27 2012-04-12 Johnson & Johnson Vision Care, Inc. Lentille de contact pour presbytie à translation
CN103180777A (zh) * 2010-09-27 2013-06-26 庄臣及庄臣视力保护公司 非对称平移式远视接触镜片
US8808256B2 (en) 2012-01-16 2014-08-19 Johnson & Johnson Vision Care, Inc. Eye drug delivery system

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4869587A (en) * 1987-12-16 1989-09-26 Breger Joseph L Presbyopic contact lens
EP0457553A2 (fr) * 1990-05-14 1991-11-21 Iolab Corporation Lentilles multifocales à plusieurs zones diffractives
EP0618474A1 (fr) * 1993-03-31 1994-10-05 Menicon Co., Ltd. Lentille de contact
EP0732608A1 (fr) * 1995-03-15 1996-09-18 Ciba-Geigy Ag Lentille de contact stabilisée et méthode pour stabiliser une lentille
EP0756189A2 (fr) * 1995-05-04 1997-01-29 JOHNSON & JOHNSON VISION PRODUCTS, INC. Lentilles multifocales à pouvoir moyenne

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4890913A (en) * 1982-10-13 1990-01-02 Carle John T De Zoned multi-focal contact lens
DE3377535D1 (en) * 1982-10-27 1988-09-01 Pilkington Plc Bifocal contact lens comprising a plurality of concentric zones
US5166712A (en) * 1987-06-01 1992-11-24 Valdemar Portney Multifocal ophthalmic lens
US5872613A (en) * 1992-11-23 1999-02-16 Innotech, Inc. Method of manufacturing contact lenses
GB2295686B (en) * 1994-11-30 1998-05-06 Carle John Trevor De Bifocal contact lenses
WO1997031285A1 (fr) * 1996-02-21 1997-08-28 Seiko Epson Corporation Verres de contact a foyer progressif

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4869587A (en) * 1987-12-16 1989-09-26 Breger Joseph L Presbyopic contact lens
EP0457553A2 (fr) * 1990-05-14 1991-11-21 Iolab Corporation Lentilles multifocales à plusieurs zones diffractives
EP0618474A1 (fr) * 1993-03-31 1994-10-05 Menicon Co., Ltd. Lentille de contact
EP0732608A1 (fr) * 1995-03-15 1996-09-18 Ciba-Geigy Ag Lentille de contact stabilisée et méthode pour stabiliser une lentille
EP0756189A2 (fr) * 1995-05-04 1997-01-29 JOHNSON & JOHNSON VISION PRODUCTS, INC. Lentilles multifocales à pouvoir moyenne

Cited By (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7524059B2 (en) 1999-07-02 2009-04-28 E-Vision, Llc System, apparatus and method for correcting vision with an adaptive optic
US6989938B2 (en) 2000-11-27 2006-01-24 Ophthonix, Inc. Wavefront aberrator and method of manufacturing
US7695134B2 (en) 2000-11-27 2010-04-13 Ophthonix, Inc. Apparatus and method of correcting higher-order aberrations of the human eye
US6813082B2 (en) 2000-11-27 2004-11-02 Ophthonix, Inc. Wavefront aberrator and method of manufacturing
US7293871B2 (en) 2000-11-27 2007-11-13 Ophthonix, Inc. Apparatus and method of correcting higher-order aberrations of the human eye
US7217375B2 (en) 2001-06-04 2007-05-15 Ophthonix, Inc. Apparatus and method of fabricating a compensating element for wavefront correction using spatially localized curing of resin mixtures
US7021764B2 (en) 2001-10-25 2006-04-04 Ophtohonix, Inc. Eyeglass manufacturing method using variable index layer
US6682195B2 (en) 2001-10-25 2004-01-27 Ophthonix, Inc. Custom eyeglass manufacturing method
US7249847B2 (en) 2001-10-25 2007-07-31 Ophthonix, Inc. Eyeglass manufacturing method using variable index layer
US6942339B2 (en) 2001-10-25 2005-09-13 Ophthonix, Inc. Eyeglass manufacturing method using variable index layer
US7434931B2 (en) 2001-10-25 2008-10-14 Ophthonix Custom eyeglass manufacturing method
US7503651B2 (en) 2001-10-25 2009-03-17 Ophthonix, Inc. Eyeglass manufacturing method using variable index layer
US6840619B2 (en) 2001-10-25 2005-01-11 Ophthonix, Inc. Eyeglass manufacturing method using variable index layer
US7588333B2 (en) 2001-10-25 2009-09-15 Ophthonix, Inc. Improving vision in macular degeneration patients
US6712466B2 (en) 2001-10-25 2004-03-30 Ophthonix, Inc. Eyeglass manufacturing method using variable index layer
US7845797B2 (en) 2001-10-25 2010-12-07 Ophthonix, Inc. Custom eyeglass manufacturing method
US8790104B2 (en) 2002-10-03 2014-07-29 Essilor International (Compagnie Generale D'optique Apparatus and method of fabricating a compensating element for wavefront correction using spatially localized curing of resin mixtures
CN103168267A (zh) * 2010-09-27 2013-06-19 庄臣及庄臣视力保护公司 平移式远视接触镜片
US9158129B2 (en) 2010-09-27 2015-10-13 Johnson & Johnson Vision Care, Inc. Translating presbyopic contact lens
CN103180777A (zh) * 2010-09-27 2013-06-26 庄臣及庄臣视力保护公司 非对称平移式远视接触镜片
CN103180776A (zh) * 2010-09-27 2013-06-26 庄臣及庄臣视力保护公司 平移式远视接触镜片
AU2011307360B2 (en) * 2010-09-27 2014-06-26 Johnson & Johnson Vision Care. Inc. Translating presbyopic contact lens
WO2012044534A1 (fr) * 2010-09-27 2012-04-05 Johnson & Johnson Vision Care. Inc. Lentille de contact presbytique à translation
AU2011312605B2 (en) * 2010-09-27 2014-08-07 Johnson & Johnson Vision Care, Inc. Translating presbyopic contact lens
RU2605526C2 (ru) * 2010-09-27 2016-12-20 Джонсон Энд Джонсон Вижн Кэа, Инк. Смещаемая пресбиопическая контактная линза
CN103168267B (zh) * 2010-09-27 2015-02-11 庄臣及庄臣视力保护公司 平移式远视接触镜片
RU2562697C2 (ru) * 2010-09-27 2015-09-10 Джонсон Энд Джонсон Вижн Кэа, Инк. Смещаемая пресбиопическая контактная линза
WO2012047549A1 (fr) * 2010-09-27 2012-04-12 Johnson & Johnson Vision Care, Inc. Lentille de contact pour presbytie à translation
US9170434B2 (en) 2010-09-27 2015-10-27 Johnson & Johnson Vision Care, Inc. Translating presbyopic contact lens
CN105068271A (zh) * 2010-09-27 2015-11-18 庄臣及庄臣视力保护公司 非对称平移式远视接触镜片
US8808256B2 (en) 2012-01-16 2014-08-19 Johnson & Johnson Vision Care, Inc. Eye drug delivery system

Also Published As

Publication number Publication date
GB9810992D0 (en) 1998-07-22
GB9710781D0 (en) 1997-07-23
GB2326950A (en) 1999-01-06

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