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Natural Factors HerbalFactors Eye Factors Formula Capsules Natural Factors Eye Factors Formula is a combination of herbs and nutrients that have been shown to help the eyes and reduce free radical damage. The formula includes the carotenoid, lutein, as well as bilberry, multi-anthocyanidins, carrot juice powder, and eyebright that fight free radical damage, one of the main reasons our eyesight deteriorates as we age.