A cataract is a clouding of the lens of the eye. The lens is an oval structure made mostly of protein and water sitting right behind the colored iris and pupil. Protein molecules of the lens are arranged in such a way as to keep it transparent and allow visible light to pass through it onto the retina, the sensitive tissue at the back of the eye. The lens also adjusts the eye's focus, allowing images to be seen clearly from both near and far away. Once this light reaches the retina, it is changed into nerve signals that are sent to the brain and interpreted as sight. For the retina to get a sharp image, the lens must be clear, otherwise vision becomes blurry.
Natural Health News Long-term daily multivitamin supplement use may lower cataract risk in men, according to a new study.
Past observational studies have indicated a relationship between nutritional supplement use and eye health. However, randomized trial data on the effects of long-term multivitamin supplement use and risk of eye diseases are can be thin on the ground.
To address this, researchers based at Brigham and Womens Hospital and Harvard Medical School as part of the Physicians Health Study II (PHS II) conducted a randomised, double-blind study of 14,641 US male doctors age 50 and older.
Half took a common daily multivitamin, as well as vitamin C, vitamin E and beta carotene supplements. The other half took a placebo.
The researchers followed the participants from 1997 to 2011 to see how many in each group developed …
The best thing you can do to prevent eye disorders is to make sure that your diet contains a variety of antioxidants found in fruits and vegetables. Both the lens of the eye and the aqueous humor contain protective enzymes that breakdown the damaged proteins that clump together and cause cataracts. Antioxidants keep these enzymes from being destroyed. Vitamin C, vitamin E (mainly tocopherols), glutathione, and a variety of carotenoids are present in lens tissue and in the fluid that surrounds it.