A couple of years ago DH and I had a wicked case of dry eye. DH was having more problems than I had -- he kept getting little cysts that the Dr said were the result of dry eye.
One day I got something in my eye and went in to the clinic on an emergency and the Opthomologist (not the one we usually see) suggested that I start taking Flax Seed Oil. DH and I have both been taking it since and all of our dry eye symptoms have disappeared.