Invasive keratitis

Acanthamoeba keratitis is a rare disease in which amoebae of the genus Acanthamoeba invade the clear portion of the front (cornea) of the eye, and affects roughly 100 people in the United States each year. Acanthamoeba are protozoa found nearly ubiquitously in soil and water, and can cause infections of the skin, eyes, and central nervous system. [Source: Wikipedia ]