WO2013186573A1 - Moule et procédé de formation de lentilles de contact - Google Patents

Moule et procédé de formation de lentilles de contact Download PDF

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Publication number
WO2013186573A1
WO2013186573A1 PCT/GB2013/051564 GB2013051564W WO2013186573A1 WO 2013186573 A1 WO2013186573 A1 WO 2013186573A1 GB 2013051564 W GB2013051564 W GB 2013051564W WO 2013186573 A1 WO2013186573 A1 WO 2013186573A1
Authority
WO
WIPO (PCT)
Prior art keywords
male
mould
contact
lens
mould portion
Prior art date
Application number
PCT/GB2013/051564
Other languages
English (en)
Inventor
Paul Stidworthy
James Parton
Armin Ebrahimpour
Original Assignee
Dealtforce Limited
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 Dealtforce Limited filed Critical Dealtforce Limited
Publication of WO2013186573A1 publication Critical patent/WO2013186573A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B13/00—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor
    • B24B13/005—Blocking means, chucks or the like; Alignment devices
    • B24B13/0052—Lens block moulding devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B29D11/00009—Production of simple or compound lenses
    • B29D11/00038—Production of contact lenses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B13/00—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor
    • B24B13/0025—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor for contact lenses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B29D11/00009—Production of simple or compound lenses
    • B29D11/0048—Moulds for lenses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B29D11/00932—Combined cutting and grinding thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B29D11/00932—Combined cutting and grinding thereof
    • B29D11/00942—Combined cutting and grinding thereof where the lens material is mounted in a support for mounting onto a cutting device, e.g. a lathe, and where the support is of machinable material, e.g. plastics
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
    • G02B1/041—Lenses
    • G02B1/043—Contact lenses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2823/00—Use of polyalkenes or derivatives thereof as mould material
    • B29K2823/10—Polymers of propylene
    • B29K2823/12—PP, i.e. polypropylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0003—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular electrical or magnetic properties, e.g. piezoelectric

Definitions

  • the present invention relates to a kit for forming a contact lens and to a method of using the kit.
  • the invention relates to the use of dissimilar mould surfaces to avoid a number of problems associated with the prior art.
  • soft contact lenses are manufactured by one of two main processes.
  • lenses are made by a cast moulding process where the contact lens material is pressed between two thermoplastic moulds which are formed by an injection moulding process.
  • This is normally a high volume, highly automated, high throughput process that requires a large amount of investment.
  • Lenses manufactured by this process can be made very economically and are manufactured for a few pence.
  • the economics of the process require large volumes of the same prescription lenses to be produced.
  • a contact lens is lathe-cut from a cylindrical disc of the contact lens forming material. This is a much slower and more expensive manufacturing process for producing lenses and is used normally for making bespoke speciality contact lenses. Lenses manufactured by this route can cost several pounds to manufacture but the process provides the only economically feasible route to preparing low volume prescriptions.
  • the present invention provides a kit for moulding a contact lens, the kit comprising a male mould portion and a female mould portion, the male and female mould portions each having a contact surface for, in use, contacting the surface of a moulded contact lens, and wherein the polarity of the contact surfaces of the male and female mould portions differ.
  • the present invention relates to an intermediate or 'hybrid' manufacturing process that combines aspects of the two conventional approaches.
  • a generic "blank" lens, or lens precursor is manufactured by cast moulding.
  • the process involves moulding the finished back surface that goes on the eye. This means that only of a relatively small number of stock keeping units are required to be held to account for the eye shape and dimensions generally required. It is also possible, although not essential, to mould the finished back surface to provide correction for astigmatism. This would require a larger number of stock keeping units, but this would still be relatively small in comparison with conventional methods.
  • the precursor lens is then machined or "lathe-cut" to achieve the desired refractive correction on the front surface of the lens. The lathe- cutting allows for millions of permutations in the final lens prescription.
  • This hybrid process reduces the manufacturing cost over the fully lathed contact lens by approximately 50%. While the process does not offer the total flexibility of back surfaces of the fully lathed product, it allows for a flexible process for intermediate volumes of lenses. Indeed, by offering all 3 manufacturing processes, the correct procedure can be selected depending upon the volumes required. In all 3 of these processes a dry lens is produced which is then hydrated in a subsequent process to produce the final soft lens. Water content of the final lens can vary typically from 20% to 80% depending upon the material.
  • a male mould portion is the portion of a mould cavity that has a convex surface upon which the contact lens is formed.
  • contact lenses are generally shaped to form a portion of the surface of a sphere.
  • a female mould portion is the complementary portion of a mould cavity that has a concave surface within which the contact lens is formed.
  • the male and female mould portions are held so as to define a cavity therebetween within which a contact lens precursor may be formed, preferably by cast moulding.
  • Cast moulding is quick and efficient.
  • the contact surfaces as defined herein are the surface upon or against which the contact lens blank is formed.
  • the male and female mould portions each have a contact surface which together forms an inner surface of the mould cavity.
  • the polarity of the contact surfaces of the male and female mould portions differ. That is, the contact surface of the male mould has a different polarity to that of the contact surface of the female mould.
  • one contact surface may be substantially non-polar, while the other surface is polar.
  • both surfaces may be polar, but the polarity of one surface may be more polar than the other.
  • the polarity of the contact surface of the male mould portion is greater than the polarity of the contact surface of the female mould portion. This can be used to allow the male portion of the mould, which contacts the generic eye-shaped surface on the lens precursor, to preferentially retain the contact lens when the mould is opened.
  • the contact surface of the female mould portion is substantially non-polar and/or the contact surface of the male mould portion is substantially polar.
  • Polarity refers to a separation of electric charge leading to a molecule or its chemical groups having an electric dipole or multipole moment.
  • Polar molecules interact through dipole-dipole intermolecular forces and hydrogen bonds.
  • Molecular polarity is dependent on the difference in electronegativity between atoms in a compound and the asymmetry of the compound's structure. For example, a molecule of water is polar because of the unequal sharing of its electrons between oxygen and hydrogen in which the former has larger electronegativity than the latter, resulting in a "bent" structure, whereas methane is considered nonpolar because the carbon shares the electrons with the hydrogen atoms almost uniformly.
  • polarity can be best determined by comparing the polarity of two materials and, indeed, orders of polarity are commonly cited.
  • a suitable contact surface for the male and female mould portions is polypropylene.
  • the contact surface of the male mould portion and/or the contact surface of the female mould portion comprises polypropylene.
  • the use of a polypropylene contact surface allows for the ready injection moulding formation of the desired mould pieces.
  • the polypropylene can be supplemented by co-polymers to finely tune the desired polarity of one or both contact surfaces.
  • the contact surface of the male mould portion comprises a maleic anhydride graft co-polymer. It has been found that the use of maleic anhydride is particularly suitable as an additive for the formation of a polar mould surface.
  • the contact surface of the male mould portion comprises from 0.05 to 5wt% maleic anhydride, more preferably from 0.1 to 2wt% and most preferably from 0.5 to 1 wt%.
  • the material of the contact surface will preferably be the same material as the entire mould portion for ease of manufacture.
  • the contact surface of the female mould portion does not comprise maleic anhydride and is substantially non-polar. This permits the selective retention of a conventional contact lens material on the male portion of the mould.
  • maleic anhydride as the active ingredient in a polypropylene mould promotes adhesion between the polypropylene surface and the dry contact lens material preform.
  • the adhesion can be controlled and different levels can be selected for different contact lens materials.
  • the present invention provides a method for making a contact lens using the kit described herein, the method comprising: forming a contact lens precursor in a mould cavity defined between the contact surfaces of the male and female mould portions;
  • the contact lens precursor is formed by moulding, preferably cast moulding.
  • Cast moulding techniques and the formulations suitable for forming contact lenses in this way are well known in the art. Cast moulding and the techniques disclosed herein are suitable, for example, for both hydrogels and silicone hydrogels.
  • the step of separating the male and female mould portions simply involves separating the two mould portions. This can be achieved manually or automatically using a machine. Due to the differing polarities of the contact surfaces of the male and female mould portions, the lens precursor is preferentially retained on either the male or the female mould portion. Preferably the lens precursor is retained on the male portion as it is easier to lathe the "male" side of the lens precursor than the "female".
  • the step of lathing is well known in the art.
  • the lathe is used on the exposed surface of the contact lens precursor to form a contact lens. That is, the lathe cuts away material from the lens surface to achieve the desired prescription.
  • the contact lens is released from the mould portion by hydrating the contact lens. This causes the lens to swell and increases the ease of removing the lens.
  • the lens can be physically removed or separated from the supporting mould by force.
  • the present invention provides for the use of a polar polymer to retain a contact lens precursor on a surface of a support during a lens finishing or shaping process.
  • the standard moulding systems used in the prior art use the same materials for both surfaces of the mould with no appreciation that the use of a polar polymer can allow for the selective retention described herein.
  • Figure 1 a shows a closed assembly of male and female mould halves.
  • Figure 1 b show an exploded view of a lens between male and female mould halves.
  • Figure 2 shows the male mould mounted on a mandrel ready to go into the lathe.
  • Figure 3 shows a cross-section of a lens preform on a male mould during lathing.
  • Figure 4a shows a finished lens still mounted on the male mould following the lathing.
  • FIG. 4b shows a more detailed view of a male mould on a mandrel.
  • Figure 1 a shows a two part assembly 1 of a male mould portion 10 and a female mould portion 5.
  • the female mould portion 5 has a substantially cylindrical side wall which, in the assembly 1 , overlaps a cylindrical base of the male mould portion 10.
  • the female mould portion 5 has a top layer that forms the upper concave surface of a cavity (not shown) between the male mould portion 10 and the female mould portion 5.
  • the male mould portion 10 has a top layer that forms the lower convex surface of a cavity (not shown) between the male mould portion 10 and the female mould portion 5.
  • Handle portions formed on the male mould portion 10 and female mould portion 5 allow for the transfer of the portions and to allow the portions to be held secure relative to each other.
  • the cavity between the male mould portion 10 and the female mould portion 5 is filled with a solution for forming a contact lens 15.
  • the technique for forming the lens 15 is cast moulding. Once the lens has been cast, the assembly 1 is transferred to the lathe (not shown). The assembly is kept closed until just before lathe processing in order to avoid damage to the lens 15. Before lathing, the lens 15 is exposed by the separation of the male mould portion 10 from the female mould portion 5 as shown in Figure 2.
  • the contact surface of the male mould portion 10 which forms the lower convex surface of the cavity (not shown) is formed of a polar material, such as a polypropylene and maleic acid graft copolymer in a 50:50 weight ratio.
  • the maleic graft copolymer comprises 2.5wt% maleic acid.
  • the contact surface of the female mould portion 5 which forms the upper concave surface of the cavity (not shown) is formed of a non-polar material, such as a polypropylene. Due to the differences in the polarity, the lens is
  • the opening of the assembly 1 exposes excess lens material 25 around the fringe of the precursor lens 15.
  • the male mould 10 and female mould 5 may fit with sufficient tolerance to allow the edge of the precursor lens 15 to be moulded without excess peripheral material. However, this is not essential, and embodiments are considered in which excess material around the precursor lens 15 results from moulding and is subsequently removed by the lathe.
  • the male mould portion 10 is mounted on a mandrel 20 for supporting the portion 10 during the subsequent lathing operation. As shown in Figure 3, during lathing, the excess lens material 25 is removed and the desired prescription is obtained by lathing the surface of the lens 15 to transform it from its precursor state to a final prescription lens.
  • the male mould 10 After lathing, the male mould 10 is removed from the mandrel 20 and may be reused.
  • the lens 15 is removed from the male mould 10 by the addition of water and then mechanically lifting the lens from the mould 10.
  • a preform is manufactured by the cast moulded procedure.
  • This is a semi finished dry lens that has the back surface already formed by the cast moulding process but is typically thicker than a conventional dry moulded contact lens to allow a proportion of material to be removed from the front surface by the lathing process.
  • the preform is not removed from the male and female injection moulded shells as would be the case in the normal cast moulding process. Instead the closed shells are used to protect the preform from atmospheric effects or mechanical damage as it is transferred to the lathing process.
  • the female mould is removed, leaving the preform on the male mould. This can then be presented to the lathe where the final refractive surface can be cut into the preform giving the final dry lens.
  • This finished dry lens can then either be hydrated away from the male mould shell or mechanically removed and subsequently hydrated.
  • FIG. 4b A preferred feature of the mandrel 15 is shown in Figure 4b. As can be seen in this figure, an indentation is formed in the mandrel 15 into which the handle of the male mould 10 is inserted when the male mould 10 is mounted on the mandrel 15.
  • the inventor has discovered that it is possible to modify the moulding material of the male mould with an adhesion promoter that causes the semi-finished preform to stay on the male mould during removal of the female mould and during the lathing process.
  • an adhesion promoter that causes the semi-finished preform to stay on the male mould during removal of the female mould and during the lathing process.
  • the preferred adhesion promoter selected in this process is maleic anhydride.
  • the male mould currently consists of a 50% blend by weight of a standard injection moulding grade of homopolymer polypropylene, manufactured by Total grade PPH1 1012 and 50% of a polypropylene modified with maleic anhydride (ExxonMobil Exxelor PO1020). This contains between 0.5 and 1 .0% grafted maleic anhydride. This is for silicone hydrogel contact lens material.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Ophthalmology & Optometry (AREA)
  • Physics & Mathematics (AREA)
  • Eyeglasses (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)

Abstract

L'invention concerne un kit pour former une lentille de contact et un procédé utilisant le kit. L'invention concerne, en particulier l'utilisation de surfaces de moule différentes pour éviter un certain nombre de problèmes associés à l'état de la technique. Un kit pour mouler une lentille de contact comprend une partie de moule mâle (10) et une partie de moule femelle (5) comprenant chacune une surface de contact destinée, lors de l'utilisation, à entrer en contact avec la surface d'une lentille de contact moulée (15), la polarité des surfaces de contact des parties de moule mâle et femelle étant différente.
PCT/GB2013/051564 2012-06-15 2013-06-14 Moule et procédé de formation de lentilles de contact WO2013186573A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB1210695.1 2012-06-15
GB1210695.1A GB2503037A (en) 2012-06-15 2012-06-15 Mould and method for forming a Contact Lens

Publications (1)

Publication Number Publication Date
WO2013186573A1 true WO2013186573A1 (fr) 2013-12-19

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PCT/GB2013/051564 WO2013186573A1 (fr) 2012-06-15 2013-06-14 Moule et procédé de formation de lentilles de contact

Country Status (2)

Country Link
GB (1) GB2503037A (fr)
WO (1) WO2013186573A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017151364A1 (fr) * 2016-03-03 2017-09-08 Verily Life Sciences Llc Composants électroniques incorporés dans des lentilles de contact rigides et perméables au gaz
WO2018011586A3 (fr) * 2016-07-14 2018-02-22 Coopervision International Holding Company, Lp Procédé de fabrication de lentilles de contact en hydrogel de silicone à taux d'évaporation réduits

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB201515399D0 (en) 2015-08-28 2015-10-14 Coopervision Int Holding Co Lp Method and apparatus for manufacturing contact lenses

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EP0635347A1 (fr) * 1993-07-21 1995-01-25 Ciba-Geigy Ag Moule pour les lentilles
US5894002A (en) * 1993-12-13 1999-04-13 Ciba Vision Corporation Process and apparatus for the manufacture of a contact lens
US20020016383A1 (en) * 1999-12-16 2002-02-07 Junichi Iwata Long wearable soft contact lens
EP1876191A1 (fr) * 2005-04-28 2008-01-09 Mitsubishi Chemical Corporation Résine de polypropylène modifiée par un acide, procédé servant à produire celle-ci et composition de résine utilisant celle-ci
US20080054505A1 (en) * 2006-08-08 2008-03-06 Li Yao Interference fitting polar resin ophthalmic lens molding devices and related methods
US20080286586A1 (en) * 2004-01-09 2008-11-20 E. I. Dupont De Nemours And Company Polypropylene Modification for Improved Adhesion of Polypropylene-Based Multilayer Packaging Film Structure to Vaccum Deposited Aluminum
US20090108479A1 (en) * 2007-10-26 2009-04-30 Bausch & Lomb Incorporated Method for Making Biomedical Devices

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US4150073A (en) * 1977-05-25 1979-04-17 Neefe Charles W Method of controlling the adhesion of a molded plastic lens to the mold
US5158718A (en) * 1990-08-02 1992-10-27 Pilkington Visioncare, Inc. Contact lens casting
CN1230554A (zh) * 1999-04-02 1999-10-06 清华大学 一种用马来酸酐接枝制备高极性改性聚丙烯材料的方法

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0635347A1 (fr) * 1993-07-21 1995-01-25 Ciba-Geigy Ag Moule pour les lentilles
US5894002A (en) * 1993-12-13 1999-04-13 Ciba Vision Corporation Process and apparatus for the manufacture of a contact lens
US20020016383A1 (en) * 1999-12-16 2002-02-07 Junichi Iwata Long wearable soft contact lens
US20080286586A1 (en) * 2004-01-09 2008-11-20 E. I. Dupont De Nemours And Company Polypropylene Modification for Improved Adhesion of Polypropylene-Based Multilayer Packaging Film Structure to Vaccum Deposited Aluminum
EP1876191A1 (fr) * 2005-04-28 2008-01-09 Mitsubishi Chemical Corporation Résine de polypropylène modifiée par un acide, procédé servant à produire celle-ci et composition de résine utilisant celle-ci
US20080054505A1 (en) * 2006-08-08 2008-03-06 Li Yao Interference fitting polar resin ophthalmic lens molding devices and related methods
US20090108479A1 (en) * 2007-10-26 2009-04-30 Bausch & Lomb Incorporated Method for Making Biomedical Devices

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017151364A1 (fr) * 2016-03-03 2017-09-08 Verily Life Sciences Llc Composants électroniques incorporés dans des lentilles de contact rigides et perméables au gaz
CN108778699B (zh) * 2016-03-03 2021-01-15 威里利生命科学有限责任公司 嵌入刚性透气隐形眼镜的电子器件
CN108778699A (zh) * 2016-03-03 2018-11-09 威里利生命科学有限责任公司 嵌入刚性透气隐形眼镜的电子器件
KR20180123714A (ko) * 2016-07-14 2018-11-19 쿠퍼비젼 인터내셔날 홀딩 캄파니, 엘피 감소된 증발률을 갖는 실리콘 히드로겔 콘택트 렌즈를 제조하는 방법
CN109073783A (zh) * 2016-07-14 2018-12-21 库柏维景国际控股公司 制造具有降低的蒸发速率的硅酮水凝胶隐形眼镜的方法
GB2566168A (en) * 2016-07-14 2019-03-06 Coopervision Int Holding Co Lp Method of manufacturing silicone hydrogel contact lenses having reduced rates of evaporation
KR101983528B1 (ko) 2016-07-14 2019-05-28 쿠퍼비젼 인터내셔날 홀딩 캄파니, 엘피 감소된 증발률을 갖는 실리콘 히드로겔 콘택트 렌즈를 제조하는 방법
US10422927B2 (en) 2016-07-14 2019-09-24 Coopervision International Holding Company, Lp Method of manufacturing silicone hydrogel contact lenses having reduced rates of evaporation
EP3430448B1 (fr) 2016-07-14 2019-10-02 CooperVision International Holding Company, LP Procédé de fabrication de lentilles de contact en hydrogel de silicone à taux d'évaporation réduits
WO2018011586A3 (fr) * 2016-07-14 2018-02-22 Coopervision International Holding Company, Lp Procédé de fabrication de lentilles de contact en hydrogel de silicone à taux d'évaporation réduits
GB2566168B (en) * 2016-07-14 2021-03-10 Coopervision Int Ltd Method of manufacturing silicone hydrogel contact lenses having reduced rates of evaporation and/or ionoflux
US11150384B2 (en) 2016-07-14 2021-10-19 Coopervision International Limited Method of manufacturing silicone hydrogel contact lenses having reduced rates of evaporation
US11650352B2 (en) 2016-07-14 2023-05-16 Coopervision International Limited Method of manufacturing silicone hydrogel contact lenses having reduced rates of evaporation

Also Published As

Publication number Publication date
GB201210695D0 (en) 2012-08-01
GB2503037A (en) 2013-12-18

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