Retinopathy of prematurity is also associated with other risk factors, such as assisted ventilation for longer than one week, surfactant therapy, cumulative illness severity, low caloric intake, hyperglycemia and insulin therapy, sepsis, fluctuations in blood gas measurements, intraventricular hemorrhage (IVH), bronchopulmonary dysplasia (BPD) and early administration of erythropoietin for the treatment of anemia of prematurity [11, 12, 13, 14, 15, 16, 17, 18]. This evidence concerns the gene EPO and bronchopulmonary dysplasia.