| http://www.w3.org/ns/prov#value | - Elderly people are most at risk.Grass, soil, water, beach sand and sea foam can reflect up to 25% of the sun's rays, adding to the overall UV exposure, warns the WHO. For people who spend lots of time outdoors, particularly in the summer months, the RNIB recommends wearing sunglasses, glasses or contact lenses with a built-in UV filter that have a CE mark or carry British Standard BSEN 1836:1997.S
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