Dry Eyes Diet

Today I ate a can of sardines. It's a fatty fish and is supposed to be good for people with dry eyes. I bought several cans of sardines, and I have tuna and salmon (canned...I hope it isn't necessary that the fish is fresh). I need to try to eat stuff on that diet six times a week. I don't know if I can actually do it, but I don't want to use drops longer than I have to.