Contact Lens Materials & Water Content |
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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
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