Natural Factors Eye Factors Formula 90 CapsulesEye Factors Formula is a combination of eye supportive nutrients that help to nourish your eyes for optimal performance. Bilberry’s active ingredients are a group of flavonoids called anthocyanosides. Anthocyanosides are powerful antioxidants that prevent free radical damage. The most promising research shows that bilberry extract improves nighttime visual acuity, with quicker adjustment to darkness and faster restoration of vision after exposure to glare. Further studies show that bilberry extract also helps those with hemeralopia (day blindness), or the inability to see distinctly in bright light.