A group of rare genetic diseases in which the cells of the retina break down slowly over time, causing loss of vision. Typically starts in childhood, often progresses to complete blindness. Many different kinds of gene mutation can lead to it. Often only the eyes are affected, but sometimes it is part of a broader syndrome. An example is the mitochondrial disorder Neuropathy, Ataxia, Retinitis Pigmentosa Syndrome (NARP), which can present with an array of neurological symptoms.
