VEGF Concentrations After Intravitreal Bevacizumab vs Ranibizumab as a Treatment for Type 1 ROP

The Retinopathy of Prematurity (ROP) is one of the leading causes of blindness on the pediatric age worldwide. This pathology is characterized for arrest of the normal vascular and neuronal retina that because of pathological compensatory mechanisms results in proliferation of vascular tissue that grow in the limit between the vascular retina and the avascular retina. The ET-ROP group classified the ROP by those who need treatment immediately or those who doesn't need treatment, The classification is the following Type 1 ROP--\>ROP zone I any stage with plus, zone I stage 3 without plus, zone II stage 2 y 3 with plus Type 2 ROP --\> Zone 1, Stage 2 or 3 without plus, and Zone II, stage 3 without plus. The treatment is begun on patient with type 1 ROP and type 2 ROP is maintained in observation.