Intacs are tiny rings made of plastic that are inserted into a narrow channel in the cornea created by a laser. Intacs can reduce nearsightedness and astigmatism in patients with keratoconus. Many people with keratoconus can delay or avoid a corneal transplant by getting Intacs. Placing Intacs in the cornea restores the natural dome shape of the cornea to improve vision. This short, painless outpatient procedure may make eyeglass and contact lens wear easier for some patients with keratoconus.