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Eye Health

Contact Lens Materials & Water Content

Contact Lenses are commonly grouped into four groups based on water content (less than 50% water are considered to be low water content lenses, and greater than 50% water are high-water content) and on whether the lens surface is considered to be ionic (reactive) or non-ionic (less reactive).

Group 1 Contact Lenses (Low water content, non-ionic)
  • Tefilcon (38% water) Cibasoft, Illusions, Torisoft
  • Tetrafilcon A (43% water) CooperToric, Preference, Preference Toric, Vantage
  • Crofilcon (38% water) CSI, CSI Toric
  • Ploymacon (38% water) Biomedics 38, Edge III, Z4/Z6, Soflens 38
  • Lotrafilcon A (24%) Focus Night & Day
  • Lotrafilcon B (38%) O2Optix
  • Galyfilcon A (47%) Acuvue Advance with Hydraclear, Advance for Astigmatism
  • Senofilcon A (38%) Acuvue Oasys
Group 2 Contact Lenses (High water content, non-ionic)
  • Alfafilcon A (66%) Soflens 66
  • Omafilcon A (62%) Proclear Compatibles
  • Nelfilcon A (69%) Focus Dailies, Dailies Toric
  • Hilafilcon A (70%) Soflens 1-day
  • Hilafilcon B (59%) Soflens 59
Group 3 Contact Lenses (Low Water content, ionic)
  • Phemfilcon A (38%) Durasoft 2
  • Balafilcon A (36%) Purevision
Group 4 Contact Lenses (High Water, Ionic)
  • Etafilcon A (58%) Acuvue, Acuvue Bifocal, Acuvue 2, Acuvue 1-day
  • Ocufilcon D (55%) Biomedics 55, Biomedics 55 Premier
  • Phemfilcon A (55%) Durasoft 3, Freshlook, Wildeyes
  • Methafilcon A (55%) Sunsoft Eclipse, Revolution, Sunsoft Toric
  • Vilfilcon A (55%) Focus 1-2 Week, Focus Toric, Focus Progressives