47 results about "UV filter" patented technology

UV filters are individual compounds or mixtures that block or absorb ultraviolet (UV) light. Two major applications of UV filters are in sunscreens, where they protect the skin from sunburn and other damage, and in photography, where they are used to coat a glass disc which fits on top of the lens. These have become less necessary with digital cameras, as the medium is less sensitive to ultraviolet light. When exposed to UV light, these filters can undergo transformations into other chemicals that are less protective and possibly toxic. As a result, there are practical concerns about the choice of chemical to use beyond just which has the desired filtering properties.