You may be eligible for Intacs if you: Are 21 years of age or older Have keratoconus, pellucid marginalis, or other conditions marked by corneal bulging and thinning Have unstable vision or an irregular corneal shape after LASIK Have visual distortion even with glasses or contact lenses Are unable to wear your contacts comfortably Patients with central corneal scarring or extremely thin and steep corneas may not be eligible for Intacs. Corneal transplant procedures may be considered for these very advanced keratoconus patients.