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Now that lenses have been developed, they are permitted for overnight usage due to their high oxygen permeability (extended wear). Additionally, silicone hydrogel materials are available for Contact Lens Market that are certified for daily use.  More flexible than stiff lenses, soft lenses can be gently rolled or folded without doing any harm to the lens. While new soft lens wearers frequently experience lens awareness rather than pain or discomfort, new stiff lens wearers must adapt for a while before comfort can be reached. Water in hydrogel lenses is what allows oxygen to get from the lens to the cornea. Higher water content lenses therefore allowed more oxygen to reach the cornea. Si-hy lenses, also known as silicone hydrogel. The oxygen permeability of silicone hydrogels is independent of the water content of the lenses because silicone permits more oxygen permeability than water.

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