Green, black, and oolong teas contain large quantities of polyphenols. Polyphenols, which are a class of bioflavonoids, have been shown to reduce free radical damage. Most of the polyphenols in green tea are catechins. Catechins, which are antioxidants by nature, have also been shown to help decrease redness and irritation. Tea also contains caffeine, which is very useful to help decrease the appearance of puffy eyes.