The aim of the study is to progress in the understanding of the early retinal vascular and
neural abnormalities in patients with diabetes, using a new device, the Dynamic Vessel
Analyzer. The Dynamic Vessel Analyzer allows to measure the diameter of the retinal vessels
and to assess how it varies in presence of various stimuli. Then, we will be able to assess
if a vascular and/or a neural dysfunction is present early in patient with diabetes.