Zeaxanthin works by protecting your macula from high-energy blue-wave light waves that damage the eye, as well as free radicals. Free radicals are harmful molecules implicated in cellular destruction (aging). They are created as natural byproducts of metabolism, as well as a result of ultraviolet and blue light entering the eye. Their creation can be accelerated by chronic fatigue, smoking, and a compromised immune system. As an antioxidant, zeaxanthin is able to neutralize or destroy these free radicals, protecting your eyes from damage from these highly reactive chemicals.