Wettability of contact lenses

Wettability is a feature that is closely linked to the stability of the vision. This is related to the tear's stability when it blinks. A lens that is not well moistened is more prone to accumulate deposits, with an increase in friction and dryness and optical instability.

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Silicone hydrogel lenses, which are the most sold at the moment, and the rigid permeable gas, after being manufactured, receive a plasma treatment to reduce the hydrophobic properties of the surface.

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Wettability is measured by depositing a drop of water on the surface of the lens and the contact angle is measured. The bigger, the more wettable it is.