Are the Continuous Glucose Monitoring Systems Able to Improve Long Term Glycaemic Control in Type 1 Diabetic Patients?

Inclusion Criteria: * Type 1 Diabetes for ≥ 12 months or more (including Cpeptide negative secondary diabetes) * Children between 8 and 18 years old * Adults between 18 and 60 years old * Patients treated with basal-bolus insulin regimens, pump or multiple daily injection, only with analogs, for at least 6 months * Performing at least 2 finger sticks glucose controls per day * Able and motivated to use the device * HbA1c ≥ 8% twice with HPLC method(DCA 2000 excluded) * Written informed consent obtained prior to enrollment in the study Exclusion Criteria: * Blindness or impaired vision so the screen cannot be recognized * Allergy to sensor * Active proliferative retinopathy not stabilized by laser or vitrectomy occurence in the 6 months prior to visit 1, or any other unstable (rapidly progressing) retinopathy that may require photocoagulation or surgical treatment during study * Treatment with systemic corticosteroid or medication known to influence insulin sensitivity in the 3 months prioir to visit 1 * Pregnancy * Manifest psychiatric disturbance * Presence of any conditions (medical, including clinically significant abnormal laboratory test, psychological, social or geographical) actuel or anticipated that the investigators feels would compromise the patient safety or limit his/her successful participation in the study. * Hemoglobinopathy that interfers with HbA1c measurement