Figure 1. Potential antioxidant and Nε-hexanoyl-lysine levels in proliferative diabetic retinopathy and macular hole patients. The vitreous and serum levels of (A) potential antioxidant (PAO) and (B) Nε-hexanoyl-lysine (HEL) were significantly higher in proliferative diabetic retinopathy (PDR) versus macular hole (MH). *p<0.05, **p<0.01 versus MH (Tukey test).