Diabetes Mellitus is a metabolic disease characterized by the presence of elevated blood glucose levels. Diabetes itself causes other chronic complications, including an eye disease known as diabetic retinopathy. Nowadays, diabetic retinopathy is the most frequent cause of blindness among the active population of developed countries. The principles that produce this disease are not completely known and can not yet be prevented. However, there are effective treatments that delay their evolution as long as it is diagnosed with sufficient anticipation. The problem of diabetic retinopathy is that it is an asymptomatic disease and only defects appear in the vision at an advanced stage of the disease. So in the early stages of diabetic retinopathy is usually imperceptible, diabetic patients do not realize that they have the disease and do not undergo an eye examination. Sometimes the patient i...