One 2-year study on people with glaucoma, a condition that leads to a gradual loss of sight, found that taking 120 mg of bilberry anthocyanins daily improved visual function by around 30%, whereas the placebo group experienced worsened visual function .
Other studies suggest that supplementing with 160–480 mg of powdered bilberry extract daily may reduce eye dryness and other symptoms of eye fatigue caused by working with video display terminals .
And many more…
You may have noticed a theme here - most of these ingredients, other than being essential nutrients, are antioxidants, and this is the primary mechanism that science understands whereby they can protect and benefit your eyes.
Additional Nutrients that we feel are worth taking to optimize the health of the eyes include:
The minerals: Zinc , Copper , Magnesium , Chromium  and Calcium .
Vitamins: B1 , B12 , and Biotin (B7).
The Amino Acids: N Acetyl Cysteine , and L- Taurine .
The Plant sourced Antioxidants: Eyebright , Grape Seed Extract , Quercetin  and Rutin 
And lastly the very powerful Antioxidant Alpha Lipoic Acid , which occurs naturally in the body, and which is often used for detoxification, Blood Sugar Balance and Liver Support, as well as Eye Health.