Patients with type 2 diabetes and macular edema involving the center of the macula in both eyes will be randomly assigned to receive conventional treatment in accordance with national guidelines or to receive intensive treatment, with a systematic screening for sleep apnea and /or uncontrolled high blood pressure, and intensified intervention on both anomalies if detected. The primary outcome will be the percentage of patients having a sustained 50% or more-decrease in retinal thickening at 1 year. Secondary outcomes will be the percentage of patients having a 2 ETDRS lines or more-increase in visual acuity at one year, number of ocular interventions in each group, prevalence of sleep apnea and uncontrolled high blood pressure in the intervention group.
