KDR and age-related macular degeneration: Serum KDR levels were measured in patients with early AMD vs. control group (A) and exudative AMD vs. control groups; however, no statistically significant difference was found (median (IQR): 0.732 (0.840) vs. 0.938 (0.771), p = 0.386; median (IQR): 0.871 (0.500) vs. 0.938 (0.771), p = 0.659, respectively).