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Proposed Classification of Silicone Hydrogel Lenses
| Group | Basis of Categorization | Examples of Polymer Types |
|---|---|---|
| Va | Nonlinear relationship between Dk (oxygen permeability) and water content | Comfilcon A |
| Vb | Contain an ionic (anionic) component | Balafilcon A |
| Vc | Plasma or bonded surface modification | Lotrafilcon A and B; Asmofilcon A |
| Vd | “Released” wetting agent | Galyfilcon A; Senofilcon A |
