[1]
https://pmc.ncbi.nlm.nih.gov/articles/PMC7866075
[2] https://www.nei.nih.gov/research/clinical-trials/age-related-eye-disease-studies-aredsareds2/about-areds-and-areds2
[3] https://www.researchgate.net/publication/12548258_The_effect_of_bilberry_nutrition_supplementation_on_night_visual_acuity_and_contrast_sensitivity
[4] https://pmc.ncbi.nlm.nih.gov/articles/PMC3485447/
[5] https://pmc.ncbi.nlm.nih.gov/articles/PMC1462955/
[6] https://pubmed.ncbi.nlm.nih.gov/14681716/
[7] https://pubmed.ncbi.nlm.nih.gov/7933422/
[8] https://pubmed.ncbi.nlm.nih.gov/22858124/