Evaluation of the Electroretinogram Pattern (Diopsys® NOVA System) for the Early Diagnosis of Glaucoma

Inclusion Criteria: * Man and woman age ≥ 18 years * Francophone * Patient with medical insurance * Refraction: sphere ± 5.0 D and cylinder ± 3.0 D * Pupillary diameter ≥ 3mm * Early glaucoma patients : * Intraocular pressure\> 21 mmHg or \<21mmHg under treatment * Thickness of pathological retinal nerve fibers with at least one affected area (OCT) * At least one reliable visual field (false positives, false negatives and fixation losses ≤ 25%) and no artifacts, with Corrected Pattern Standard Deviation (CPSD) pathological in the 5% and Glaucoma Hemifield Pathological test and an early attack (MD\> -6dB) * Patient at risk for glaucoma with: * And / or family history of glaucoma * and / or intraocular pressure\> 21 mmHg * and / or retinal nerve fibers (pathological thickness in at least one area on the OCT) * and / or reliable visual field (false positives, false negatives and fixation losses ≤ 25%) and without artifact, with pathological Corrected Pattern Standard Deviation (CPSD) in the 5% and Glaucoma Hemifield Pathological Test and an early onset (MD\> -6 dB). Exclusion Criteria: * Visual acuity below 20/30 (Snellen scale or equivalent on another visual acuity scale) * Unreliable visual field (false positives, loss of fixation and false negatives\> 25%) * History of intraocular surgery (except uncomplicated cataract surgery) * Ocular pathology other than associated glaucoma * Neurological disease affecting the visual field or the optic nerve * History of macular laser or pan retinal photocoagulation * Unreliable ERGP pattern * Offset OCT, unreliable * Refusal to participate in the study * Patient under tutorship or curatorship * Patient deprived of liberty * Epileptic patient * Eczema of the eyelids or allergy to one of the components of the electrodes or skin gel allowing the cleaning of the skin before the positioning of the electrodes.