A possible future form of vision correction, corneal inlays and onlays are composed of biocompatible materials that mimic the corneal surface of the eye. Differing from traditional LASIK correction procedures, there is no laser used to reshape the surface of the eyes. The inlays and onlays alter the way that light rays enter the eye, which helps to correct vision imperfections. This is very similar to contact lenses.
These devices do not require regular removal or continuous care, like a contact lens would. They are not placed behind the cornea, like surgically implantable contact lenses, but are placed over top of the cornea, and seamlessly merge with the tissue. These lenses can also be removed at a later time if necessary.
These lenses may help surgeons to avoid certain complications associated with the creation of corneal flaps during procedures like LASIK and PRK. These lenses are not currently not FDA-approved, but are in the process of clinical trials.