Certain vitamins are essential for maintaining good eye health. Many are powerful antioxidants that protect the eyes and other parts of the body from oxidative damage and inflammation.
Deficiencies in particular vitamins can increase the risk of some eye conditions, such as cataracts, glaucoma, and age-related macular degeneration (AMD). Research suggests that some vitamin and mineral supplements may help protect against or slow the development of these conditions.
In this article, we outline four vitamins that are essential for good eye health. We also discuss three additional nutrients that are beneficial for the eyes. Finally, we list the various dietary sources of these vitamins and nutrients.
People who wish to protect the health of their eyes should try to include sufficient amounts of the following vitamins in their diet.
1. Vitamin A and beta carotene
Vitamin A is
Vitamin A also supports the function of the cornea, which is the protective outer layer of the eye. A person who is deficient in vitamin A may find that their eyes produce too little moisture to stay lubricated.
Beta carotene is the primary source of vitamin A in the human diet. Beta carotene is a type of plant pigment called a carotenoid that exists in many colorful fruits and vegetables. When a person consumes carotenoids, their body converts the pigments into vitamin A.
2. Vitamin E
Alpha tocopherol is a form of vitamin E that has particularly powerful antioxidant properties.
Antioxidants help fight free radicals, which damage tissues throughout the body. Sometimes, free radicals may damage proteins within the eye. This damage can result in the development of cloudy areas called cataracts on the lens of the eye.
However, the authors note that a separate study showed that vitamin E supplements had no effect on the progression of cataracts. They conclude that further research is necessary to determine the effectiveness of vitamin E supplements in preventing and slowing cataract development.
3. Vitamin C
Vitamin C is another powerful antioxidant that helps protect against oxidative damage.
Oxidative damage is a key factor in two of the
A 2016 longitudinal study investigated different factors that may help prevent nuclear cataract development. The study involved more than 1,000 pairs of female twins.
At the start of the study, the researchers measured the participants’ cataracts. They then tracked each participant’s intake of vitamin C and other nutrients over 10 years.
At the end of the study period, the researchers remeasured the cataracts in 324 pairs of twins. The participants who reported consuming more vitamin C showed a 33% reduction in the risk of cataract progression. They also had clearer lenses overall.
4. B vitamins
However, this particular study only included women. Further research is, therefore, necessary to support the use of B-vitamins in preventing AMD in both women and men.
Research suggests that the following nutrients are also beneficial for the eyes.
1. Lutein and zeaxanthin
Lutein and zeaxanthin are carotenoids that exist in high quantities in green leafy vegetables. They are also present in the lens and retina of the eye.
As antioxidants, lutein and zeaxanthin may help reduce oxidative damage in the retina. Some research suggests that taking approximately
Zinc is a mineral that helps maintain the health of the retina, cell membranes, and protein structure of the eye.
Zinc allows vitamin A to travel from the liver to the retina to produce melanin. Melanin is a pigment that protects the eyes from ultraviolet (UV) light.
According to the American Optometric Association, zinc supplementation may help people who have AMD or are at risk of developing the condition. Taking 40–80 mg of zinc each day, alongside certain antioxidants, could slow the progression of advanced AMD by 25%. It could also reduce visual acuity loss by 19%.
3. Omega-3 fatty acids
Specifically, omega-3s reduce the buildup of fatty deposits in the blood vessels, including those that supply blood to the retina.
A balanced, healthful diet containing a range of the following foods should provide enough vitamins and nutrients to promote good eye health.
People who take medications or have an existing health condition should check with their doctor before taking dietary supplements. In some cases, certain supplements may be harmful to health. For example, high dosages of zinc can affect how the body absorbs copper.
Below, we list the dietary sources of the vitamins that we mention in this article.
Vitamin A and beta carotene:
Vitamin B-1, or thiamine:
- green peas
Vitamin B-2, or riboflavin:
Vitamin B-3, or niacin:
- beef liver
- salmon and tuna
- brown and white rice
Vitamin B-6, or pyridoxine:
- dark leafy greens
- beef liver
- salmon and tuna
Vitamin B-9, or folic acid:
- dark leafy greens
- sunflower seeds
Vitamin B-12, or cobalamin:
- red meat
- fortified milk, cereals, and nutritional yeast
People can only get vitamin B-12 from animal sources. As such, people who do not consume animal products will need to take vitamin B-12 supplements or consume products that manufacturers have fortified with vitamin B-12.
Lutein and zeaxanthin:
- seafood, such as oysters, crab, and lobster
- pumpkin seeds
- whole grains
- fortified cereals
Vegetarians may need to
Omega-3 fatty acids:
Specific vitamins and nutrients are essential for maintaining good eye health. Some may even help prevent certain eye diseases from developing or progressing.
A balanced, healthful diet will provide people with the necessary range of nutrients. The diet should include whole grains, legumes, and plenty of colorful fruits and vegetables.