Social Cognition in Multiple Sclerosis, From a Study of Eye Movement and Gaze Strategies Using Video-oculography

Inclusion Criteria: * Male or Female. * 18 years old and above. * Sufficient written and oral expression in French. * Covered by a health insurance system * Written informed consent signed by the patient. * For the MS group: \* Patient diagnosed according to diagnostic criteria established by Polman et al. (2010): Radiologically Isolated Syndrome compatible with MS (RIS), Clinically Isolated Syndrome compatible with MS (CIS), Relapsing-Remitting MS, Secondary Progressive MS, or Primary Progressive MS. \* Hospitalized or coming to perform a consultation. * For the control group: No cognitive impairment (non pathological Mini-Mental State Examination (MMSE), according to age, gender and socio-cultural level). Exclusion Criteria: * General anaesthesia within 3 months. * Ophthalmological problems preventing a video-oculography examination. * Oculomotor disorders: * For the control group: "fixation disorders" or "ocular tracking disorders". * For the MS group: atypical disorders. * Cognitive disorders of the type: visual agnosia, visuo-spatial disorder, visuo-perceptual disorder or aphasia. * Other neurological or ophthalmological disorders than MS * History of stroke. * Psychotropic drugs consummation.