Oxygen permeability

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Oxygen permeability (abbreviated Dk) is a parameter of a contact lens. "Oxygen permeability" expresses the ability of the lens to let oxygen reach the eye by diffusion. Another parameter is the transmissibility level (abbreviated DK/t), the Dk per thickness of the lens, and is generally more used. Typical values are from 25 to 50. In soft contact lenses, it is dependent on the thickness of the lens and the material of the lens, especially concerning the water content.

[edit] External links

• Oxygen Permeability of Contact Lenses Materials (article from a DK testing machines company)