Feasibility of a Video-oculography in Patients With Huntington's Disease VOG-HD Study

Inclusion Criteria: * Corrected visual acuity \>1/10 * Aged over 18 years * Patient with the mutation that is to say the presence of an abnormal number of trinuclide: CAG\> 38 in the first exon of the huntingtin gene. * Total Functional Capacity Scale (CFT) ≥ 3 Exclusion Criteria: * Patients or trustworthy person who have not given their written consent, informed and signed. * Patients are not affiliated or who are not entitled to Social Security * Private patients of liberty by administrative or judicial decision, or patients supervision * Associated disease with neurological repercussions