Synopsis

Source of validity: Scientific
Rating (out of 5): 3

Berry flavors, particularly those derived from bilberry (a European relative of the blueberry) and blackcurrant, have a historical association with eye health, but there is also some scientific evidence supporting their role. Berries are rich in anthocyanins, a class of flavonoids with potent antioxidant properties. During World War II, British pilots reportedly consumed bilberry jam to improve night vision, popularizing its use for eyesight support. Scientifically, several animal and human studies suggest anthocyanins can help protect retinal cells from oxidative stress and may improve circulation to the eyes. Some small clinical trials have indicated potential improvements in subjective symptoms of eye fatigue, night vision, and adaptation to darkness after supplementation with bilberry or blackcurrant extracts.

However, the quality and scale of the evidence is moderate at best. Systematic reviews and larger clinical trials have not consistently demonstrated clear, significant improvements in visual acuity or measurable eyesight parameters in healthy adults. The evidence is stronger for potential benefits in specific conditions, such as slowing the progression of diabetic retinopathy or reducing eye fatigue, rather than broadly “treating poor eyesight.” In summary, while there is a historical tradition, the scientific basis is growing but not definitive, warranting a moderate evidence rating.

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