It has been suggested that this section be split out and merged into the article titled Contact lens#Soft lenses, which already exists. (Discuss) (January 2022)
In the US market, soft contact lenses are approved by the US Food and Drug Administration.[2] The American Optometric Association published a contact lens comparison chart called Advantages and Disadvantages of Various Types of Contact Lenses on the differences between them.[3] These include:
soft contact lenses
rigid gas-permeable (RGP)
daily wear
extended wear
disposable
planned replacement contact lenses.
The US Food and Drug Administration (FDA) defines soft contact lenses as:
made of soft, flexible plastics that allow oxygen to pass through to the cornea. Soft contact lenses may be easier to adjust to and are more comfortable than rigid gas permeable lenses. Newer soft lens materials include silicone-hydrogels to provide more oxygen to your eye while you wear your lenses.[4]
HistoryEdit
The first contact lenses were made of glass, in 1888. Initially the glass was blown but soon lenses were made by being ground to shape. For the first fifty years, glass was the only material used. The lenses were thin, yet reports of injury were rare. In 1938 perspex (polymethylmethacrylate, or PMMA) began to replace glass in contact lens manufacture. PMMA lenses were easier to produce so the production of glass lenses soon ended. Lenses made of PMMA are called hard lenses.[5] Soft contact lenses were first produced in 1961 by Czech chemical engineer Otto Wichterle using polyhydroxyethylmethacrylate (pHEMA), a material that achieved long-term commercial application. Lenses made of polyacrylamide were introduced in 1971.[5]
TypesEdit
The FDA classifies soft contact lenses into four groups for the US market. They are also subcategorized into 1st generation, 2nd generation, and 3rd generation lens materials.[6] These 'water-loving' soft contact lens materials are categorized as "Conventional Hydrophilic Material Groups ("-filcon"):
Below is a list of most contact lens materials on the market, their water percentage, their oxygen permeability rating, and manufacturer brands.[14][15][16][17] Note that the higher the oxygen transmissibility rating, the more oxygen gets to the eye.
^Denise Hampton, Ph.D (13 May 2014). (PDF). www.fda.gov. FDA Division of Ophthalmic and Ear, Nose and Throat Devices. p. 97. Archived from the original (Microsoft PowerPoint) on 18 June 2016.
^"Caring for Your Vision: Advantages and Disadvantages of Various Types of Contact Lenses". www.aoa.org. American Optometric Association. Retrieved 18 June 2016.
^Center for Devices and Radiological Health. "Contact Lenses - Types of Contact Lenses". www.fda.gov. U.S. Food and Drug Administration. Retrieved 18 June 2016. This article incorporates text from this source, which is in the public domain.
^ ab(PDF). rsc.org. Royal Society of Chemistry. Archived from the original (PDF) on 19 June 2016. Retrieved 19 June 2016.
^. Archived from the original on 2016-08-10. Retrieved 2016-06-28.
^Ophthalmic Devices Panel of the Medical Devices Advisory Committee (May 13, 2014). (PDF). U.S. Food and Drug Administration. p. 2. Archived from the original (PDF) on 7 August 2015. Retrieved 18 June 2016.
^Loretta B. Szczotka-Flynn (February 2005). . Contact Lens Spectrum. Archived from the original on 6 October 2015. Retrieved 18 June 2016.
^Tina Kiang; Joseph Hutter; J Angelo Green; K Scott Phillips; Malvina B Eydelman (10 Nov 2011). (PDF). Food and Drug Administration. Archived from the original (PDF) on 17 November 2011.
^(PDF). www.fda.gov. U.S. Food and Drug Administration. n.d. p. 25. Archived from the original (PDF) on 1 May 2015. Retrieved 18 June 2016.
^"Editorial - Should Silicone Hydrogels be Placed in a Separate FDA Soft Contact Lens Category?". www.siliconehydrogels.org. Retrieved 18 June 2016.
^Stretton, Serina (October 2004). "Should Silicone Hydrogels be Placed in a Separate FDA Soft Contact Lens Category?". siliconehydrogels.org. Retrieved 3 September 2020.
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The examples and perspective in this deal primarily with the United States and do not represent a worldwide view of the subject You may improve this discuss the issue on the talk page or create a new as appropriate November 2020 Learn how and when to remove this template message Soft contact lenses are one of several types of contact lenses for corrective vision eyewear as prescribed by optometrists and ophthalmologists 1 Contents 1 Background 1 1 History 2 Types 3 Contact lens polymers 3 1 Hydrogel groups 3 1 1 Low water nonionic 3 1 2 High water nonionic 3 1 3 Low Water ionic 3 1 4 High Water ionic 3 1 5 Silicone hydrogel polymers 3 2 Production generations 4 ReferencesBackground EditIt has been suggested that this section be split out and merged into the article titled Contact lens Soft lenses which already exists Discuss January 2022 In the US market soft contact lenses are approved by the US Food and Drug Administration 2 The American Optometric Association published a contact lens comparison chart called Advantages and Disadvantages of Various Types of Contact Lenses on the differences between them 3 These include soft contact lenses rigid gas permeable RGP daily wear extended wear disposable planned replacement contact lenses The US Food and Drug Administration FDA defines soft contact lenses as made of soft flexible plastics that allow oxygen to pass through to the cornea Soft contact lenses may be easier to adjust to and are more comfortable than rigid gas permeable lenses Newer soft lens materials include silicone hydrogels to provide more oxygen to your eye while you wear your lenses 4 History Edit The first contact lenses were made of glass in 1888 Initially the glass was blown but soon lenses were made by being ground to shape For the first fifty years glass was the only material used The lenses were thin yet reports of injury were rare In 1938 perspex polymethylmethacrylate or PMMA began to replace glass in contact lens manufacture PMMA lenses were easier to produce so the production of glass lenses soon ended Lenses made of PMMA are called hard lenses 5 Soft contact lenses were first produced in 1961 by Czech chemical engineer Otto Wichterle using polyhydroxyethylmethacrylate pHEMA a material that achieved long term commercial application Lenses made of polyacrylamide were introduced in 1971 5 Types EditThe FDA classifies soft contact lenses into four groups for the US market They are also subcategorized into 1st generation 2nd generation and 3rd generation lens materials 6 These water loving soft contact lens materials are categorized as Conventional Hydrophilic Material Groups filcon Group Water Content Percentage Ionic Non IonicI Low Water Content lt 50 NonionicII High Water Content gt 50 NonionicIII Low Water Content lt 50 IonicIV High Water Content gt 50 IonicNote Being ionic in pH 6 0 8 0 7 The FDA has been considering updating soft contact lens group types and related guidance literature 8 9 10 Contact lens polymers EditThe materials that are classified in the 5 FDA groups include the ones listed in the next 5 sections 11 12 FDA classification of soft contact lens materials 13 FDA lens group Adopted name Transmissibility level Dk x10 11 Water content Chemical compositionInon ioniclow water content galyfilcon A 60 47 lotrafilcon A 140 24 DMA siloxane TRISlotrafilcon B 110 33 polymacon 7 5 36 HEMAtetrafilcon 9 0 43 5 HEMA MMA NVPIInon ionichigh water content alphafilcon A 22 9 66 HEMA NVPhilafilcon A 26 9 70 omafilcon A 19 6 62 HEMA PCIIIioniclow water content balafilcon A 99 36 NCVE NVP PBVC TPVCbufilcon A 16 0 45 DA HEMA MAAIVionichigh water content etafilcon A 17 0 58 HEMA MAAocufilcon D 19 7 55 vifilcon A 16 0 55 HEMA MAA PVPDA diacetone acrylamide DMA N N dimethylacrylamide HEMA 2 Hydroxyethyl methacrylate MAA methacrylic acid MMA methyl methacrylate NCVE N carboxl vinyl ester NVP N vinyl pyrrolidone PBVC poly dimethylsiloxyl di silybutanol bis vinyl carbamate PC phosphorylcholine TPVC tris trimethylsiloxysilyl propylvinyl carbamate TRIS tris hydroxylmethyl aminomethane Hydrogel groups Edit Below is a list of most contact lens materials on the market their water percentage their oxygen permeability rating and manufacturer brands 14 15 16 17 Note that the higher the oxygen transmissibility rating the more oxygen gets to the eye Low water nonionic Edit Material Water Oxygen Transmissibility Dk t BrandsTefilcon 38 8 9 Cibasoft Illusions Torisoft Softint STD LL BifocalTetrafilcon A 43 9 Cooper Clear Cooper Toric Preference Preference Toric Vantage Vantage Accents Vantage Thin Vantage Thin AccentsCrofilcon 38 13 CSI CSI ToricHelfilcon A B 45 12 Continental Toric Flexlens Flexlens Toric Flexlens Aphakic Optima Toric All X Cel lensesMafilcon 33 4 MeniconPolymacon 38 6 8 5 24 3 Allvue Biomedics 38 Clearview CustomEyes 38 EpconSOFT EsstechPS Esstech PSD Esstech SV Frequency 38 HD HD T HDX HDX T Horizon 38 Hydron Mini Hydron Zero 4 SofBlue Hydron Zero 6 SofBlue Hydron Versa Scribe Lifestyle MV2 Ideal Soft Lifestyle Xtra Lifestyle 4Vue Lifestyle Toric Bifocal LL38 Metrosoft ll Multifocal Metrosoft Toric Natural Touch Occasions Optima 38 SP PS 45 Multifocal Simulvue 38 Sof form II SofLens SofLens38 SofLens Multi Focal Softics SoftView Unilens 38 Westhin Toric EZvue Soft Contact Lens SoloticaHioxifilcon B 49 15 Alden HP Sphere Alden HP Toric Aquaease Essential Soft Toric Multifocal Flexlens Quattro Satureyes Satureyes Toric and Multifocal All X Cel LensesHigh water nonionic Edit Material Water Oxygen Transmissibility Dk t BrandsSurfilcon A 74 35Lidofilcon A 70 31 ActiFresh 400 CV 70Lidofilcon B 79 38Netrafilcon A 65 34 5Hefilcon B 45 10 Optima ToricAlphafilcon A 66 32 SofLens Toric for AstigmatismOmafilcon A 58 60 28 36 7 Proclear 1 Day Proclear EP Proclear 1 day Multifocal Proclear Multifocal Toric Biomedics XC AveoOmafilcon B 62 21 3 52 3 Proclear Sphere Proclear toric Proclear toric XR Proclear multifocal Proclear multifocal XR Proclear multifocal toricVasurfilcon A 74 39 1 Precision UVHioxifilcon A 59 28 Alden HP Sphere Alden HP Toric ExtremeH O 59 Thin Extra Biocurve Gold Sphere and Toric Aura ADM Scout by Warby Parker 18 Hydro by Hubble Miru 1 Day 19 Hioxifilcon D 54 21 Alden HP Sphere Alden HP Toric ExtremeH O 54 Clarity H 0 C Vue Advanced Custom ToricNelfilcon A 69 26 Focus Dailies Focus Dailies Toric Progressive Dailies AquaComfort Plus FreshLook One Day Synergy TritonHilafilcon A 70 35Hilafilcon B 59 22 SofLens 59 SofLens Daily Disposable SofLens Daily Disposables for AstigmatismAcofilcon A 58 25 5 Flexlens Tricurve KeratoconusNesofilcon A 78 42 Biotrue ONEdayLow Water ionic Edit Material Water Oxygen Transmissibility Dk t BrandsBufilcon A 45 16 Hydrocurve II 45 Soft Mate BDeltafilcon A 43 10 Amsoft Amsoft Thin Comfort Flex Custom Flex Metrosoft Soft Form ToricPhemfilcon 38 9 Durasoft 2High Water ionic Edit Material Water Oxygen Transmissibility Dk t BrandsBufilcon A 55 16 Hydrocurve I Hydrocurve 3 Toric Softmate IIPerfilcon A 71 34 PermalensEtafilcon A 58 23 8 28 Acuvue Acuvue Bifocal Acuvue 2 Acuvue 2 Colors 1 Day Acuvue 1 Day Acuvue Moist 1 Day Acuvue Moist for Astigmatism 1 Day Acuvue Moist Multifocal 1 Day Acuvue Define Colornova Discon Waldo Natural Vue OcylensFocofilcon A 55 16 Fre FlexOcufilcon B 52 53 16 24 ClearSight 1 Day Continental Ocu Flex 53Ocufilcon C 55 16 UCL55 UCL PediatricOcufilcon D 55 17 8 28 1 Biomedics 55 Premier asphere Biomedics Toric ClearSight 1 Day Toric Horien 1 Day DisposableOcufilcon E 65 22 Ocuflex 65Ocufilcon F 60 24 3 Hydrogenics 60 UVPhemfilcon A 55 16 Durasoft 3 Freshlook WildeyesMethafilcon A 55 17 9 37 6 Biocurve Advanced Aspheric Biocurve 1 Day Biocurve Toric amp Sphere C Vue 1 Day ASV C Vue 55 Edge III 55 Elite AC Elite Daily Elite AC Toric Expressions Colors Flexlens Frequency 55 Sphere Multifocal HD2 HDX2 Horizon 55 Bi Con Hubble Kontur LL55 New Horizons Revolution Sauflon 55 Sof form 55 Sunsoft Eclipse Sunsoft Toric Vertex Sphere Vertex ToricMethafilcon B 55 14 5 31 3 Frequency 55 Toric Hydrasoft Sphere Hydrasoft Sphere Thin Hydrasoft Aphakic Hydrasoft Aphakic Thin Hydrasoft Toric Hydrasoft Toric ThinVilfilcon A 55 16 Focus 1 2 Week Softcolors Focus Monthly Softcolors Focus Toric Focus Progressives Soft 55 Soft 55 EWSilicone hydrogel polymers Edit Material FDA Group Water Oxygen Transmissibility Dk t Modulus MPa Center Thickness mm BrandsLotrafilcon A 1 24 175 20 1 5 0 08 Air Optix Night amp Day AquaLotrafilcon B 1 33 110 138 1 0 0 08 O2Optix Air Optix for Astigmatism Air Optix Aqua Air Optix Aqua MultifocalGalyfilcon A 1 47 86 21 0 43 0 07 Acuvue Advance with Hydraclear Acuvue Advance for AstigmatismSenofilcon A 1 38 103 147 0 7 0 07 Acuvue Oasys Acuvue Oasys for Astigmatism Acuvue Oasys for Presbyopia Acuvue Oasys 1 Day Acuvue Oasys 1 Day for Astigmatism Acuvue Oasys with TransitionsSenofilcon C 41 129 147 0 77 0 07 Acuvue Vita Acuvue Vita for AstigmatismSifilcon A 1 32 82 0 08 O2Optix CustomComfilcon A 1 48 116 160 0 75 0 08 Biofinity Biofinity toric Biofinity XR Biofinity XR toric Biofinity Energys Biofinity multifocalEnfilcon A 1 46 100 0 6 0 06 Avaira Avaira ToricBalafilcon A 3 36 91 130 1 1 0 09 PureVision PureVision Toric PureVision Multi Focal PureVision2 PureVision2 for Astigmatism PureVision2 Multi Focal for PresbyopiaDelefilcon A 33 99 water gradient 156 22 0 7 0 09 Dailies Total1 Dailies Total1 Multifocal DailiesTotal1 for AstigmatismNarafilcon B 1 48 55 1 Day Acuvue TruEye old Narafilcon A 46 118 0 66 0 085 1 Day Acuvue TruEye new Stenfilcon A 54 80 100 0 4 0 08 MyDay MyDay toric MyDay MultifocalSomofilcon A 56 57 86 0 5 0 07 Clariti 1 day Clariti 1 day toric Clariti 1 day multifocalFanfilcon A 55 90 110 0 6 0 06 Avaira Vitality Avaira Vitality toric 24H ToricSamfilcon A 46 23 163 24 0 7 0 07 Bausch amp Lomb Ultra Bausch amp Lomb Ultra for Astigmatism Bausch amp Lomb Ultra for PresbyopiaElastofilcon 0 2 340 SilSoft Aphakic SilSoft Super PlusKalifilcon A 55 134 25 0 5 0 08 Bausch amp Lomb INFUSEAsmofilcon A 40 161 26 0 9 0 08 Miru 1monthVerofilcon A 51 80 water gradient 100 0 6 0 09 Alcon Precision1 Alcon Precision1 for AstigmatismLehfilcon A 55 99 water gradient 154 27 0 6 0 08 Total30Production generations Edit There are three generations of silicone hydrogel contact lens materials 28 1st Generation 2nd Generation 3rd GenerationMaterial Lotrafilcon A Balafilcon A Senofilcon A Galyfilcon A Samfilcon A Comfilcon A Enfilcon A Asmofilcon A 29 Features TRIS structures plasma treated high modulus Modified Tanaka monomer lack of coatings higher Dk for water content No TRIS structure no surface treatments or wetting agents breaks traditional water Dk modulus relationshipsReferences Edit About Contact Lenses clma net clma net Contact Lens Manufacturers Association Retrieved 18 June 2016 Denise Hampton Ph D 13 May 2014 Contact Lens Safety Ophthalmic Devices Panel PDF www fda gov FDA Division of Ophthalmic and Ear Nose and Throat Devices p 97 Archived from the original Microsoft PowerPoint on 18 June 2016 Caring for Your Vision Advantages and Disadvantages of Various Types of Contact Lenses www aoa org American Optometric Association Retrieved 18 June 2016 Center for Devices and Radiological Health Contact Lenses Types of Contact Lenses www fda gov U S Food and Drug Administration Retrieved 18 June 2016 nbsp This article incorporates text from this source which is in the public domain a b Polymers in everyday things Contact Lenses PDF rsc org Royal Society of Chemistry Archived from the original PDF on 19 June 2016 Retrieved 19 June 2016 The FDA has created the 4 Lens groups of hydrogels Materials to clarify categories of similar polymers for investigating solutions approvals Archived from the original on 2016 08 10 Retrieved 2016 06 28 Ophthalmic Devices Panel of the Medical Devices Advisory Committee May 13 2014 FDA Executive Summary Prepared for the May 13 2014 Meeting of the Ophthalmic Devices Panel of the Medical Devices Advisory Committee PDF U S Food and Drug Administration p 2 Archived from the original PDF on 7 August 2015 Retrieved 18 June 2016 Loretta B Szczotka Flynn February 2005 Contact Lens Materials Advocating a New Lens Group Contact Lens Spectrum Archived from the original on 6 October 2015 Retrieved 18 June 2016 Contact Lens Compendium contactlensupdate com Contact Lens Spectrum Retrieved 18 June 2016 Tina Kiang Joseph Hutter J Angelo Green K Scott Phillips Malvina B Eydelman 10 Nov 2011 Updating the Contact Lens Classification System PDF Food and Drug Administration Archived from the original PDF on 17 November 2011 Contact Lenses Manufacturing Chemistry PDF www fda gov U S Food and Drug Administration n d p 25 Archived from the original PDF on 1 May 2015 Retrieved 18 June 2016 Editorial Should Silicone Hydrogels be Placed in a Separate FDA Soft Contact Lens Category www siliconehydrogels org Retrieved 18 June 2016 Stretton Serina October 2004 Should Silicone Hydrogels be Placed in a Separate FDA Soft Contact Lens Category siliconehydrogels org Retrieved 3 September 2020 Contact Lens Spectrum Soft Contact Lenses www clspectrum com Contact Lens Spectrum Retrieved 19 Feb 2019 CooperVision Product Reference Guide 2019 PDF coopervision com CooperVision Retrieved 19 Feb 2019 Acuvue Tech Specs Winter 2017 PDF www acuvue com Johnson amp Johnson Retrieved 19 Feb 2019 Contact Lenses Bausch Lomb www bausch com Bausch amp Lomb Retrieved 19 Feb 2019 Scout by Warby Parker 90 Pack Contacts Warby Parker Miru 1 Day Contacts LensPricer 10 2 4 AONDA Product Page MyAlcon Dr Karen French 12 May 2008 The Performance of Galyfilcon A PDF OpticianOnline Net Contact Lens Monthly Retrieved 18 June 2016 Dailies TOTAL1 Lens Parameters and Fitting Guide Alcon David L Kading May 2014 New Lens Technology Targets Improved Vision and Comfort Contact Lens Spectrum Vol 29 Lens Parameters pi bausch com Retrieved 30 March 2023 Bausch Lomb INFUSE Optix now Optix now Your Vision Care Guide Retrieved 2020 12 23 Miru 1month Menicon America Menicon America Retrieved 2021 05 01 TOTAL30 Parameters and Contact Lens Technology Alcon Looking at Silicone Hydrogels Across Generations www optometricmanagement com Optometric Management Retrieved 18 June 2016 Carnt Nicole May 2008 3rd Generation Silicone Hydrogel Lenses www siliconehydrogels org Retrieved 5 October 2021 Retrieved from https en wikipedia org w index php title List of soft contact lens materials amp oldid 1172129455, wikipedia, wiki, book, books, library,
