DHA/EPA are docosahexaenoic and eicosapentaenoic acids, respectively. More commonly, they are referred to as Omega-3 Fatty Acids. They are commonly found in cold-water fishes and have been recently found to be incredibly beneficial for health of the body and eyes. Including DHA/EPA into the daily diet has shown to be important for visual development and retinal functions. If the body is deficient in DHA/EPA, it could lead to chronic problems with dry eyes. Salmon, Tuna, Mackerel, Anchovy, Trout and others are all really great sources for DHA/EPA.
DHA/EPA is definitely one of those nutrients you must see a doctor before starting a supplemental regimen of Fish Oil. Studies have shown it can have an effect on blood pressure medications and other parts of the body, so there has to be precautions taken before intaking more DHA/EPA.