There were some studies many years back that demonstrated improved night vision
if taking bilberry.
1 randomized study and 7 non- randomized studies demonstrated positive effect from bilberry. The 4 most recent randomized controlled studies demonstrate no affect of bilberry on night vision. http://www.ncbi.nlm.nih.gov/pubmed/14711439 and http://www.Thorne.Com/altmedrev/.Fulltext/5/2/164.Pdf.