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Many years ago I did buy and try some bilberry. I am not sure that it made much difference, it is very hard to tell. These days, most people have good nutrition (in many cases over nutrition) so mild deficiency diseases that may have affected vision are no longer around. The WWII pilots in the UK who benefited from this stuff probably never eat much in the way of fresh fruit and vegetables.
I think you are better off following the other advise in the article and keeping the dark shades on and avoiding bright light for several days before an observing session. Probably the best thing you can do for your night vision is to live in a cave and only come out at night.
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