CAT and cataract: A decrease in the antioxidant defenses of the lens(i.e antioxidant enzymes such as catalase, superoxidedismutase, glutathione peroxidase, and non-enzymaticantioxidants such as glutathione) (16).All these changes disturb the function of the lenscells, increase light scattering in the lens, andcause cataracts.