Evidence is starting to appear indicating that a diet rich in omega-3 fatty acids may help prevent dry eye syndrome. Sources of omega-3 fats include salmon, trout, tuna, herring and sardines. If you are vegetarian/vegan, the following foods are rich in omega-3 fatty acids: canola oil, English walnuts, flax oil, ground flax seed, hemp oil, hemp seed, olive oil, pumpkin seeds, and soybeans.

http://medicaldude.com/2009/11/prevention-of-dry-eye-syndrome/

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