Your mother always said, “Eat your carrots—it will improve your vision.” As it turns out, there is scientific evidence that gives her some support.
Carotenoids are plant pigments with antioxidant activity. Two carotenoids in particular—lutein and zeaxanthin—are highly concentrated in the retina. Zeaxanthin is found primarily in the macula, the part of the retina responsible for sharp central vision, while lutein is distributed throughout the retina, according to research published in Investigative Ophthalmology & Visual Science (1988;29(6):850-855).
Because of their location and antioxidant properties, these carotenoids have been studied for their potential role in age-related macular degeneration (AMD). A review in Nutrition Journal (2003;2:20) noted that low dietary intake of lutein and zeaxanthin appears to be associated with a higher risk of macular degeneration, though the authors emphasized that evidence at the time was still evolving.
Larger studies have focused on antioxidant supplementation more broadly. A major trial cited in the Medical Journal of Australia (2006;184(9):455-458) followed 3,640 participants for an average of 6.3 years. Among individuals at high risk for AMD, supplementation with antioxidants (vitamin C, vitamin E, beta-carotene) and zinc significantly reduced the risk of disease progression. The benefit was less clear in participants at lower risk.
Carotenoids may also influence visual performance in otherwise healthy individuals. In a study published in Optometry and Vision Science (2008;85(2):82-88), 40 subjects were given 12 mg of lutein and zeaxanthin daily for six months. The participants showed improved visual performance under high-glare conditions. The researchers attributed this effect to increased macular pigment optical density, which helps filter damaging light and improve contrast sensitivity.
These findings are consistent with earlier research showing improved vision under low-light conditions following lutein and zeaxanthin supplementation (Ophthalmic and Physiological Optics, 2006;26(4):362-371).
Bottom line: While carrots may not give you superhuman eyesight, diets rich in carotenoids—especially lutein and zeaxanthin—do appear to support retinal health and visual function, particularly as we age.
