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.
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.
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.