In one study, 36 people with dry eye took 450 mg of EPA (eicosapentaenoic acid), 300 mg of DHA (docosahexaenoic acid), and 1,000 mg of flaxseed oil per day, or a placebo. After 90 days, 70 percent of those in the omega-3 group had no symptoms compared to 7 percent for placebo. Also compared to placebo, the omega-3 group had greater tear flow and volume.