<qa>  What is the purpose of this study?Background: The purpose of this study is to analyze the relationship between central and peripheral blood pressure clinic and ambulatory with vascular structure and function, assessed by carotid intima-media thickness IMT, artery venous retinal index, pulse wave velocity PWV and ankle-brachial index in patients with diabetes type 2 and without diabetes type 2. Develop and validate a software to measure the retinal vessels and to estimate arterio-venous index automatically. 