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Biofinity . PremiO and Avaira are the silicone hydrogel contact lenses that are considered 3rd generation
Simply put, 3rd Generation contact lenses contain:
Comfilcon A, Enfilcon A
No TRI structure, no surface treatment or wetting agent, break traditional water-Dk-modulus relationships
Comfilcon A (Biofinity, CooperVision) wa the first third-generation polymer. With no TRI-based derivatives, all of the silicon added to the materials chemistry is based on siloxy macromers1 a unique way to combine the len silicone and water properties. The patent claims that the material uses two siloxy macromer of different sizes that, when used in combination, produce very high oxygen permeability (for a given water content). The len has a Dk of 128. Enfilcon A (Avaira, CooperVision) is another third-generation material thats naturally wettable. The enfilcon A material is 46% water. The lens ha a low modulu of 0.5 MPa and a Dk of 100.
If the contact lenses do not contain Comfilcon A or Enfilcon A it i not 3rd generation.
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