Why is bilberry important It's an excellent, natural way to support healthy vision: Bilberry's visual supportive property was first clinically studied by French researchers on Royal Air Force pilots during World War II. Administration of bilberry extract resulted in support of nighttime vision, adjustment to darkness, and quick response after exposure to glare. Why use Bilberry Extract It provides the very best of bilberries to support healthy eye function: Bilberry Extract provides a strong extract of bilberries. In fact, it takes 100 pounds of bilberries to yield one pound of this superior extract. Plus, Bilberry Extract is standardized to contain the fruit's key flavonoid compounds that disarm damaging free radicals - an important factor for eye health.