**3.4 DR progression**

Actually, we have very limited knowledge about the predictive value of OCTA in DR progression (most of published studies are transversal). Nevertheless, some recent prospective studies have found a relation between DCP parameters and DR progression with statistical significance [33]. On contrary, SCP parameters do not seem to be associated with DR progression, probably because the DCP is more susceptible to ischemia (higher metabolic requirements of external retina) [40].
