Three hours or so into my daily 8- to 12-hour dose of screen time today, I saw this research from the British Journal of Nutrition. Lutein, a nutrient in green leafy vegetables and winter squash known for its eye-healthy properties, may protect eyes from damage associated with long-term computer use. In the study, individuals taking lutein supplements for 12 weeks improved their visual performance. Lutein has also been shown to reduce the risk of age-related macular degeneration, one of the leading causes of blindness in people over age 60. Get the lowdown on lutein and other eye-health supplements.