PLH-VisionDevelopment of a Visio-behavioral Scale to Evaluate Visual Abilities of Patients With Profound Multiple Intellectual Disabilities (PLH-Vision)

This study includes 3 phases: * Elaboration of a list of behavioral items by a group of multi-disciplinary expertise (physicians, nurses, caregivers, ophthalmologies, orthoptists) based on their clinical experiences. * Development of the scale based on the sample obtained by a prospective multicenter research trial. * Validation of the sample obtained by a prospective transversal multicenter study. This study will be performed in 5 centers in France. The enrollment of patients planned for 24 months targeting 310 patients. The duration of follow-up of the study for each patient will be varied according to the group of patients, il will be 1 day for group 1, 2 weeks for group 2, or 6 months for group 3.