Impaired Eye Movements in Presymptomatic Spinocerebellar Ataxia Type 6

Abstract
Patients with hereditary neurodegenerative disorders, such as Huntington disease and the spinocerebellar ataxias, typically experience onset of symptoms in adulthood and a prolonged presymptomatic period of several decades.1 The availability of genetic testing has made it possible to identify presymptomatic individuals not only to provide genetic counseling but also to study the natural history of the disease process in the presymptomatic period.