Age-related macular degeneration (AMD) is the leading cause of vision loss in people over 60 in developed countries. Cataracts affect more than half of all Americans by age 80. Both conditions have strong nutritional prevention evidence. The AREDS2 study — a large, long-term NIH-funded RCT — identified specific nutrients that significantly slow AMD progression. Dry eye syndrome, affecting over 16 million Americans, also responds to nutritional intervention, particularly omega-3 supplementation.
Best Supplements for Eye Health
We assessed each supplement for clinical evidence quality, mechanism of action, dosing transparency, and safety. Evidence grades: A = strong RCT evidence; B = good clinical evidence; C = preliminary or emerging evidence.
The primary carotenoids in the macula. They filter blue light and neutralise free radicals in photoreceptors. AREDS2 showed lutein+zeaxanthin (10 mg + 2 mg/day) significantly reduced AMD progression risk and was more effective than beta-carotene (which increased lung cancer risk in smokers). Higher macular pigment optical density correlates directly with lower AMD risk.
DHA constitutes 97% of omega-3 in the retina. Essential for photoreceptor membrane function, protection against oxidative damage, and anti-inflammatory modulation of retinal vasculature. Multiple RCTs show omega-3 supplementation significantly reduces dry eye symptoms and improves tear film stability. Higher omega-3 intake associated with 30–38% lower AMD risk.
The aqueous humor of the eye has extremely high vitamin C concentrations — it is essential for lens health and protection against UV-induced oxidative damage that drives cataract formation. AREDS2 included 500 mg vitamin C as a core component. Higher dietary vitamin C intake is associated with significantly lower cataract risk.
Fat-soluble antioxidant protecting retinal lipids from peroxidation. Included at 400 IU/day in the AREDS2 formula. Works synergistically with vitamin C and zinc for comprehensive retinal antioxidant protection. Vitamin E deficiency causes retinal damage and neuropathy.
The retina and choroid (behind the retina) have the highest zinc concentration of any tissue in the body. Zinc is essential for vitamin A metabolism in retinal rods and protective enzymes. AREDS2 includes 80 mg zinc oxide — though 25–40 mg is considered adequate for most people without AMD. High-dose zinc long-term requires copper supplementation.
Traditional remedy for eye health — pilots reportedly used bilberry jam to improve night vision in WWII. Contains anthocyanins that support retinal blood flow and rhodopsin regeneration. Evidence for night vision improvement is inconsistent; evidence for general retinal protection is emerging. Well-tolerated with good safety profile.
⚠ Safety & Medical Disclaimer
High-dose zinc (80 mg/day as in full AREDS2) causes copper deficiency — always pair with 2 mg copper. Beta-carotene (in original AREDS formula) increases lung cancer risk in smokers — the AREDS2 replaced it with lutein+zeaxanthin for this reason. Regular eye examination (annual for people over 50) is essential — AMD and glaucoma are often asymptomatic until significant damage has occurred.
Frequently Asked Questions
Clinical References
All supplement recommendations are supported by peer-reviewed research. Key citations:
- AREDS2 Research Group. (2013). JAMA. Lutein + zeaxanthin and omega-3 fatty acids for age-related macular degeneration: the AREDS2 randomised clinical trial. → Source
- Bhargava R et al. (2015). Cornea. A randomized controlled trial of omega-3 fatty acids in dry eye syndrome. → Source
- NIH Office of Dietary Supplements. Zinc Fact Sheet. → Source