Often associated with improvement of night vision, bilberries are mentioned in a popular story of World War II RAF pilots consuming bilberry jam to sharpen vision for night missions. However, a recent study[4] by the U.S. Navy found no such effect and origins of the RAF story cannot be found.

Although the effect of bilberry on night vision is unfounded, laboratory studies in rats have provided preliminary evidence that bilberry consumption may inhibit or reverse eye disorders such as macular degeneration.

Bilberries are recognized as a good source of flavonoids, some of which have antioxidant activity.

As a deep purple fruit, bilberries contain anthocyanin pigments.