BDNF and age-related macular degeneration: Besides the well-known role of neurotrophins in mediating growth, differentiation, and survival of neuronal and non-neuronal cells [31,42,116,117,118,119,120,122,138,200], there is emerging evidence that they contribute to the development of neovascularization in diseases such as diabetic retinopathy (DR) or age-related macular degeneration (AMD), too [11,201,202].