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(a) Typical monomer used in a silicone HG contact lens. (b) Water content and Dk values of HG and SiHG lenses. LA, Lotrafilcon A; LB, Lotrafilcon B; G, Galyfilcon A; C, Comfilcon A; S, Stenfilcon A; and N, Nelficon A. Comfilcon A is a third-generation SiHG with improved Dk and high water content.
