Another device that helps to reduce glare and improve vision in patients with corneal degenerative disease, are INTACS. Historically, Intacs were used to treat high amount of nearsightedness, but have been recently FDA-approved for the treatment of keratoconus. INTACS are small semi-circular implants composed of a plastic polymer that are placed within the cornea via a minimally invasive surgical procedure. They provide support and and flatten the corneal surface thereby decrease corneal irregularities that are common in people with keratoconus. Restructuring the corneal shape, in this fashion, helps reduce glare and distortions. Depending on the severity of the corneal ectasia, contacts lenses or glasses may still be necessary in order to obtain the best vision possible. INTACS are also commonly combined with collagen cross-linking.