Cataracts occur when protein collects on the lens of the eye, clouding vision. Although cataracts develop slowly over time, they may eventually cause significant vision loss that interferes with everyday activities. They can, however, be surgically removed and a substitute lens put in place. In fact, the University of Maryland Medical Center notes that cataract removal is one of the most common operations performed in the United States. Vitamin C might also play in the role in the prevention or treatment of cataracts, but should not be used in place of medical treatment. Get medical advice before taking supplemental vitamin C.
Properties and Potentlal Benefits
Vitamin C is a water-soluble vitamin that plays a key role in wound healing and collagen production and also helps support the immune system. It might also play a role in the treatment of several conditions including cardiovascular disease and cancer. Also known as ascorbic acid, vitamin C may help to protect the body's cells from oxidative damage caused by free radicals. The Office of Dietary Supplements notes that oxidative stress might contribute to the development of cataracts, and therefore vitamin C might play a role in the treatment of this condition.
Cataract Research
Evidence showing that vitamin C can help prevent or treat cataracts is mixed. Research published in the November 2006 issue of the "International Journal for Vitamin and Nutrition Research" identified a relationship between increased vitamin C intake and a reduced prevalence of cataracts. The authors conclude, therefore, that vitamin C may offer some protection against this disorder. In contrast the results of a clinical study published in the "Archives of Ophthalmology" in November 2010 show that long-term use of of vitamin C had no notable beneficial or harmful effect on the risk of cataract.
Sources and Administration
A host of foods contain varying amounts of vitamin C. Examples include green peas, Brussels sprouts, spinach, cabbage, citrus fruit, strawberries and red peppers. It is also available as a dietary supplement in capsules and tablets. The University of Maryland Medical Center notes that 500 mg to 1,000 mg two to three times daily, is sometimes used as an antioxidant to prevent cataracts. However, this dosage is only intended as a guideline. Get advice from your doctor regarding a suitable dose.
Considerations
Vitamin C supplements may cause side effects including nausea and gastrointestinal discomfort. The University of Maryland Medical Center adds that larger doses may cause loose stools. If this occurs, reduce the dosage. Don't solely rely on supplements to help prevent cataracts; wearing ultraviolet-blocking sunglasses in bright sunshine, and not smoking will also help to reduce your risk of developing cataracts.
References
- University of Maryland Medical Center: Cataracts; August 2009
- Office of Dietary Supplements: Vitamin C
- "International Journal for Vitamin and Nutrition Research"; The Relationship Between Antioxidant Nutrient Intake and Cataracts in Older People; E. Rodríguez-Rodríguez, et al.; November 2006
- "Archives of Ophthalmology"; Age-Related Cataract in a Randomized Trial of Vitamins E and C in Men; W. G. Christen, et al.; November 2010
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