Spinocerebellar ataxia type 7 (SCA7), currently the only known form of autosomal dominant cerebellar ataxia type 2 (ADCA2; see this term), is a neurodegenerative disorder characterized by progressive ataxia, motor system abnormalities, dysarthria, dysphagia and retinal degeneration leading to progressive blindness.

Any noninflammatory disease of the retina. This nonspecific term is retained here because of its wide use in the literature, but if possible new annotations should indicate the precise type of retinal abnormality.