Disorders in which one or more parts of the cornea lose normal clarity due to a buildup of cloudy material. These diseases are usually inherited, affect both eyes equally, are not caused by outside factors (such as injury or diet), progress slowly and usually occur in otherwise healthy people. Of the more than 20 types, some of the most common corneal dystrophies include Fuchs’ dystrophy, lattice dystrophy and map-dot-fingerprint dystrophy.