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Table 1 Properties of hydrogel contact lenses used in this study

From: A three-phase in-vitro system for studying Pseudomonas aeruginosa adhesion and biofilm formation upon hydrogel contact lenses

United States Adopted Name (USAN) Etafilcon A Omafilcon A Comfilcon A Lotrafilcon B
Manufacturer Johnson & Johnson Cooper Vision Cooper Vision CIBA Vision
Water content (%) 58 62 48 33
Ionic charge Ionic Non-ionic Non-ionic Non-ionic
Oxygen permeability (Dk) 22 27 128 110
Centre thickness (mm) -3.00 D 0.084 0.065 0.08 0.08
Oxygen transmissibility (Dk/t) at 35°C 33.3 42 160 138
Basis curve (mm) 8.7 8.6 8.6 8.6
Diameter (mm) 14.0 14.2 14.0 14.2
Surface treatment None None None 25-nm-thick plasma coating with high refractive index
FDA Group 4 (Conventional hydrogel) 2 (Conventional hydrogel) 1 (Silicone hydrogel)α 1 (Silicone hydrogel)β
Replacement and wearing schedule* Every 2 weeks (daily wear) OR six nights extended wear Every 4 weeks (daily wear) Every 4 weeks (daily, continuous OR flexible wear) Every 4 weeks (daily wear) OR up to six nights extended wear
Principal monomers HEMA, MA HEMA, PC FM0411M, HOB, IBM, M3U, NVP, TAIC, VMA DMA, TRIS, siloxane monomer
  1. HEMA (poly-2-hydroxyethyl methacrylate); MA (methacrylic acid); PC (phoshoryl choline); DMA (N,N-dimethylacryl amide); TRIS (trimethylsiloxy silane); DMA, N,N-dimethylacrylamide; FM0411M (α-methacryloyloxyethyl iminocarboxyethyloxypropyl-poly(dimethylsiloxy)-butyldimethylsilane); HOB (2-hydroxybutyl methacrylate); IBM (isobornyl methacrylate); M3U αω -bis(methacryloyloxyethyl iminocarboxy ethyloxypropyl)-poly(dimethylsiloxane)-poly(trifluoropropylmethylsiloxane)-poly(ω methoxy- poly(ethyleneglycol)propylmethylsiloxane); NVP (N-vinyl pyrrolidone); TAIC (1,3,5-triallyl-1,3,5-triazine-2,4,6(1H,3H,5H)-trione); VMA (N-Vinyl-N-methylacetamide)
  2. α third silicone generation
  3. β first silicone generation
  4. *It is recommended that the CL wearer first be evaluated on a daily wear schedule. If successful, then a gradual introduction of extended wear can be followed as determined by the prescribing Eye Care Practitioner.