What does the water content of a contact lens mean and is it important?
Water content is an important feature of the various plastics used to make soft contact lenses.
As a rule with conventional soft contact lenses, the higher the water content, the more oxygen can pass through the lens. This is important for lens comfort and healthy eyes - but high water content lenses may be more fragile, so are more likely to tear with frequent handling.
The relationship between water content and oxygen transmission is not the same with lenses made from silicone hydrogel materials which achieve very high levels of oxygen transmission regardless of their water content.