*This interview has been edited and condensed for clarity.\n<\/p>\n
Q: Does vitamin A really improve vision, and if so, how does it work?\n<\/p>\n
Kiser: Vitamin A, also known as retinol<\/a>, is a fat-soluble vitamin needed for human vision<\/a>. It’s transformed within the eye into a\u00a0derivative called 11-cis-retinal, which is the molecule that allows our retina to detect the light that we consciously perceive as an image.\n<\/p>\n If a person is deficient in vitamin A, their vision, especially their ability to see in dim light, will be impaired. In this case, vitamin A supplementation<\/a> would help restore normal visual function.\n<\/p>\n Humans can’t synthesize vitamin A from scratch. Instead, we get it from our diet in two different forms:\n<\/p>\n Pre-formed vitamin A<\/a>, which is naturally found in animal-derived foods or fortified into some foods like milk and cereal. Carrots are a well-known source of beta-carotene<\/a>, which is why they are often described as being \u201cgood for your eyes<\/a>.\u201d\n<\/p>\n Other sources include sweet potatoes, bell peppers, cantaloupe<\/a>, and dark leafy greens<\/a>. Both pre-formed vitamin A and provitamin A carotenoids are used in supplements.\u00a0\n<\/p>\n Who Needs a Vitamin A Supplement? <\/p>\n Healthy people who eat a balanced diet are generally able to get enough vitamin A from food and don’t require vitamin A supplements.\n<\/p>\n This is because the human body can store reserves of vitamin A in the liver, eyes, and other organs that can sustain vitamin A-dependent processes in the body for several months, even without new intake of vitamin A.\u00a0\n<\/p>\n Additionally, the vitamin A used for vision can be recycled, reducing the need for new vitamin A intake.\n<\/p>\n People who are malnourished for an extended period of time<\/a>, have diseases of the GI tract that impair the absorption of fat-soluble vitamins, and those whose diet is low in vitamin A or its precursors can develop a deficiency.\n<\/p>\n In these cases, you may need to up your intake of foods containing vitamin A or take a supplement.\n<\/p>\n Is There Such Thing as Too Much Vitamin A? <\/p>\n Vitamin A is very important for a growing fetus, and for newborn babies, so pregnant and breastfeeding women need to get enough of it. A doctor should help decide how much vitamin A to take, because taking too much of the \u201cpre-formed\u201d kind can cause problems in a baby\u2019s development.\n<\/p>\n Getting too much pre-formed vitamin A<\/a>\u2014either from supplements or foods like liver\u2014can be harmful and may damage the liver<\/a>.\n<\/p>\n But you usually don\u2019t need to worry about getting too much vitamin A from plant sources, like foods with carotenoids<\/a>. Your intestines have ways to limit how much of these plant forms your body absorbs when you already have enough vitamin A.\n<\/p>\n How Else Can I Protect My Vision? <\/p>\n There are molecules related to beta-carotene known as \u201cmacular pigments\u201d that help shield the retina from damaging blue light and oxidative stress.\n<\/p>\n These compounds, called lutein and zeaxanthin, are found in foods like mangos, egg yolks, corn, and green-leafy vegetables and are also components of the AREDS2 eye supplement.\n<\/p>\n Getting enough of these compounds is believed to help prevent some retinal diseases, like age-related macular degeneration<\/a>.<\/p>\n Verywell Health uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read our editorial process<\/a> to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy.<\/p>\n Thirunavukarasu AJ, Ross AC, Gilbert RM. Vitamin A, systemic T-cells, and the eye: focus on degenerative retinal disease<\/a>.\u00a0Front Nutr. 2022;9:914457. doi:10.3389\/fnut.2022.914457<\/p>\n Menezes MSS, Almeida CMM. Structural, functional, nutritional and clinical aspects of vitamin A: a review<\/a>.\u00a0PharmaNutrition. 2024;27:100383. doi:10.1016\/j.phanu.2024.100383<\/p>\n Chew EY, Clemons TE, Agr\u00f3n E, et al. Long-term outcomes of adding lutein\/zeaxanthin and \u03c9-3 fatty acids to the AREDS Supplements on Age-Related Macular Degeneration Progression: AREDS2 Report 28<\/a>. JAMA Ophthalmol. 2022;140(7):692-698. doi:10.1001\/jamaophthalmol.2022.1640<\/p>\n
\nMolecules that serve as precursors to vitamin A, known as provitamin A carotenoids<\/a>, like beta-carotene<\/a>.<\/p>\n![\"Mira](\"https:\/\/www.newsbeep.com\/us\/wp-content\/uploads\/2025\/08\/FE3F9AD2-9085-40B8-8E8E-AF95656B0B37-048bcc651b0f4063b40038d3df45e712.jpeg\")
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