What are silicone hydrogel contact lenses?
Silicone hydrogel contact lenses are the newest invention and can allow much greater amounts of oxygen to pass into the eye than any other contact lens. This is because the lenses are made of hydrogels (like in soft contacts), which take up water and allow oxygen to pass through and they also contain silicone (like in RGP contacts) that, again, takes up oxygen. This property allows silicone hydrogel contact lenses to be worn for around 30 days at a time, including during the night.
