Retinal dystrophy is an abnormality of the retina associated with a hereditary process. Retinal dystrophies are defined by their predominantly monogenic inheritance and they are frequently associated with loss or dysfunction of photoreceptor cells as a primary or secondary event. The phenotype is Retinal dystrophy (Human Phenotype Ontology entry HP_0000556). Also known as: Breakdown of light-sensitive cells in back of eye.