VEGF is a growth factor that is involved in numerous retinal pathologies, such as proliferative diabetic retinopathy (Gupta et al., 2013), diabetic macular edema (Penn et al., 2008), etc. HGF plays an important role in ocular angiogenesis and in neuroprotection of retinal tissue. This evidence concerns the gene HGF and proliferative diabetic retinopathy.