Flavonoids are a diverse group of phytonutrients found in fruits, vegetables, tea, and other plant-based foods. There is a growing body of scientific research supporting the use of flavonoids for eye health, particularly in relation to their antioxidant and anti-inflammatory properties. Oxidative stress and inflammation are recognized contributors to several eye conditions, including age-related macular degeneration (AMD), cataracts, and diabetic retinopathy.

Several studies have shown that flavonoid-rich extracts, such as those from bilberry and grape seed, can help improve microvascular blood flow in the retina and reduce the risk of retinal damage. For example, anthocyanins—a specific class of flavonoids—have been observed in some clinical and preclinical studies to improve night vision and slow progression of retinopathy, though results are not universally consistent. Epidemiological data also suggest that diets high in flavonoids are associated with a lower risk of developing certain vision disorders.

However, while the overall evidence is promising, it is not yet robust or conclusive enough for flavonoids to be universally recommended solely for eye health. More large-scale, well-controlled human trials are needed to confirm efficacy and optimal dosage. Thus, the evidence for flavonoids supporting the eyes is scientific in nature, with a moderate level of support (3/5).