Medico-economic Comparison Between Treatment with Panretinal Photocoagulation by Laser in 1 Session Versus 4 Sessions in Diabetic Retinopathy

Inclusion Criteria: * Persons who have provided written informed consent * Patients with type 1 or 2 diabetes according to World Health Organisation diagnostic criteria. * Patients with severe non proliferative or early proliferative diabetic retinopathy * Visual acuity of the treated eye \>= 20/32 snellen (≥ 0.63 Monoyer units or ≥ 70 letters Early treatment Diabetic Retinopathy Study) * Visual acuity of the contralateral eye \>= 20/200 snellen (≥ 0.10 Monoyer units or ≥ 35 letters Early treatment Diabetic Retinopathy Study) * Patients with a central macular thickness of 350 μm or less on Spectral Domain - Optical Coherence Tomography * Patients with national health insurance cover * Patients over 18 years old Exclusion Criteria: * Uncontrolled diabetes in the previous 6 months with intensive insulin therapy (glycated haemoglobin \> 11). * Uncontrolled hypertension. * Florid diabetic retinopathy floride. * Macular oedema due to causes other than diabetic retinopathy or in a context of vitreomacular traction. * History of intravitreal treatment with anti-angiogenic agent or corticosteroids within the 12 previous months. * History of treatment with laser in panretinal photocoagulation or focal laser on the treated eye. * History of eye surgery or laser capsulotomy within the previous 6 months * History of renal failure requiring dialysis or kidney transplantation for diabetic nephropathy. * Contra-indication for Tropicamide or Neo-synephrine * History of uncontrolled glaucoma or hypertonia * Patient with aphakia * Adult under guardianship * Pegnant or breast-feeding women