This study aims to investigate the prevalence of subclinical oculomotor disorders in a population of patients with radiologically isolated syndrome.

Inclusion Criteria:

• The patient must have given his informed consent and signed the consent form.
• The patient must be affiliated or beneficiary of a health insurance plan.
• The patient is at least 18 years old (≥) and under 50 years old (≤).
• Patients with radiologically isolated syndrome according to the criteria of Okuda et al. (2009)
• Diagnosis of a radiologically isolated syndrome confirmed by the national expert center of Nice for less than 3 years.

Exclusion Criteria:

• The subject participates in another study.
• The subject is in an exclusion period determined by a previous study.
• The subject is under guardianship, curatorship or safeguard of justice.
• The patient is pregnant or breastfeeding
• The subject refuses to sign the consent.
• It is not possible to give the subject informed information.
• Patient presenting a pathological neurological examination.
• Patient with visual acuity less than 5/10 or with ocular instability