Objectives: The primary objective of the study is to assess the feasibility of the use of EOL device in ALS patients. The secondary objective is to assess its clinical safety in subjects with ALS. We added exploratory objectives to evaluate eye movements in ALS patients, to study factors (neuropsychology, eye movements) that may influence the use of the apparatus and to evaluate a Bayesian computational model for online character recognition.(2) Methods: Eighteen subjects with ALS and motor impairment impairing normal writing will be recruited with a duration of participation of four weeks per patient. The intervention will consist in a training program to the device during six visits on site allowing a gradual acquisition of the ability to perform an eye-writing. The primary endpoint is the recognition by an outside observer of the digits 0-9 produced by the patient with the device. The secondary criteria is the record of adverse events and serious adverse events occurred during the study other than those directly related to ALS.