Bilberry

 Bilberry is any of several species of low-growing shrubs in the genus Vaccinium (family Ericaceae), bearing edible berries. The species most often referred to is Vaccinium myrtillus L., but there are several other closely related species.

Bilberry has a traditional use in eye problems, including poor vision, and 'night blindness' (the inability to differentiate between objects and colours in poor light). Night blindness, which is related to the absence of visual purple (rhodopsin), is materially improved by the powerful phytochemical antioxidant compounds such as proanthocyanidins and other polyphenolic bioflavonoids.