Neurodegeneration with Brain Iron Accumulation (NBIA) is a group of rare, genetic, neurological disorders diagnosed in children, affecting one to three people per million. All those with NBIA disorders deal with progressive movement challenges, most commonly involuntary muscle cramping, called dystonia. This can result in clumsiness, difficulty controlling the body, and speech problems. Some individuals eventually lose their ability to walk, talk, or chew food and become totally dependent on others. Also common is a degeneration of the retina, causing night blindness and a loss of peripheral vision.