Figure 3: Histological analysis of pterygium. The presence of inflammatory infiltrated cells and number and caliper of blood vessels diminished in patients that received α-lipoic acid, as observed in fibroelastic tissue with H&E staining. Similarly, an important decrement of extracellular matrix proteins was observed in this same group (α-lipoic acid-treated) after qualitative analysis using histological preparations stained with Masson’s trichrome (X100).