Soft contact lenses
Classic contact lens types: hydrogel silicone hydrogel hybrid (RGP - Rigid Gas
Permeable part in the middle of the lens, edges are out of soft materials) Since
1999, some types of silicone hydrogel contact lenses with high oxygen
permeability have been approved for extended wear (to be worn overnight, or for
longer than one day). Nowadays, extended wear is not often recommended, as
prolonged wear presents a higher risk of eye infections and other health
complications.