In theory, high levels of blue light could damage the back of the eye that controls central vision (the macula). Some lenses also have a filter to block visible blue light. These IOLs contain a filter to block harmful ultra-violet (UV) light. This artificial lens is known as an 'intraocular lens' or IOL. Cataract surgery involves removing the cloudy lens and replacing it with an artificial one. Sometimes the lens in the eye becomes cloudy, often as people become older. However, studies have been too small and too short-term to provide a reliable answer to this question. There is little evidence of any important differences between blue-light filtering and non-blue-light filtering lenses. Cochrane Review authors collected and analysed all relevant studies to answer this question and found 51 studies. The aim of this Cochrane Review was to find out if blue-light filtering artifical lenses, also known as intraocular lenses (IOLs) protect the back of the eye.
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