Night Vision

No...none that I am aware of with Bilberry extract.
Bilberry LEAF is a totally different story but, that is not usually available as an "over the counter" herbal supplement.
Absolutely the only warning I have ever heard of is that persons with blood clotting problems will bleed longer if cut & that is only with huge daily doses of Bilberry. Of course check with your family Dr. if you think it might be a problem. My Doc told me "no problem."

BILBERRY INFORMATION
Bilberry is a perennial, ornamental shrub that is commonly found in various climates in damp woodlands and moorlands. In the United States they are known as huckleberries, and there are over 100 species with similar names and fruit throughout the Europe, Asia and North America. The English call them whortleberries. The Scots know them as blaeberries. Bilberry has been used as a medicinal herb since the 16th century.
Bilberry is also used in connection with vascular and blood disorders and shows positive effects when treating varicose veins, thrombosis, and angina. Bilberry's fruit contains flavonoids and anthocyanin, which serve to prevent capillary fragility, thin the blood, and stimulate the release of vasodilators. Anthocyanin, a natural antioxidant, also lowers blood pressure, reduces clotting and improves blood supply to the nervous system. Bilberry also contains glucoquinine that has the ability to lower blood sugar.

The herb contains Vitamins A and C, providing antioxidant protection which can help prevent free radical damage to the eyes. Vitamin A is required for sharp vision, while Vitamin C helps form collagen and is needed for growth and repair of tissue cells and blood vessels. Anthocyanosides support and protect collagen structures in the blood vessels of the eyes, assuring strong, healthy capillaries that carry vital nutrients to eye muscles and nerves.

Bilberry has long been a remedy for poor vision and "night blindness." Clinical tests confirm that given orally it improves visual accuracy in healthy people, and can help those with eye diseases such as pigmentosa, retinitis, glaucoma, and myopia. During World War II, British Royal Air Force pilots ate Bilberry preserves before night missions as an aid to night vision. Bilberry works by improving the microcirculation and regeneration of retinal purple, a substance required for good eyesight.

Dried Bilberry fruit and Bilberry tea has been used as a treatment for diarrhea and as a relief for nausea and indigestion. Bilberry is also used as a treatment for mild inflammation of the mucous membranes of the mouth and throat.


Common Use: Bilberry contains nutrients needed to protect eyes from eyestrain or fatigue, and can improve circulation to the eyes. Bilberry tea is administered to treat stomach problems and soothe the digestive tract. Bilberries are used in making jams, preserves, liqueurs, and wines.