 A bandage contact lens allows the patient to see while protecting an injured or diseased cornea from the constant rubbing of blinking eyelids, thereby allowing it to heal.They are used in the treatment of conditions including bullous keratopathy, dry eyes, corneal abrasions and erosion, keratitis, corneal edema, descemetocele, corneal ectasia, Mooren's ulcer, anterior corneal dystrophy, and neurotrophic keratoconjunctivitis.Contact lenses that deliver drugs to the eye have also been developed.