Inclusion Criteria:  - Patients with an understanding of the French language to ensure a perfect understanding of the instructions during evaluations and documents relating to their involvement in the study.  Visually impaired volunteers:  Patients must have one of three conditions: Retinitis Pigmentosa, Stargardt disease, Leber optic neuropathy.  Healthy volunteers:  Visual acuity of both corrected eyes (glasses) should be higher or equal 8/10th and a normal visual field. Patients should not wear contact lenses (which may interfere with the recording of the pupil and eye movements)  Exclusion Criteria:  Pregnant or lactating women will not be able to participate in this research. Participants should not be unable to personally consent. Subjects should not participate in another clinical trial that may interfere with this research. Inability to personally consent. Subjects should not present with degenerative diseases or any other disease that could interfere with the evaluations planned during this study. The subject follows a drug treatment which can cause visual disturbances, changes in pupillary kinetics or cognitive disturbances.  Secondary exclusion criteria (at the end of the inclusion visit):  Visually impaired subjects and controls for which calibration is not feasible. Patients and control subjects having difficulty maintaining visual fixation. Patients and subjects wearing corrective lenses making it impossible to record oculomotor activity with an infrared camera oculometer.