UV exposure may also be involved in the development of age-related macular degeneration (AMD). Worldwide, it is estimated that 15 million people are blind due to cataracts; of these, some 10% may be due to exposure to UVR. Vitamin D production. UVR in small amounts is essential to good health as it leads to the production of vitamin D in the body. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.