Blue Light Filtering Glasses

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<p>According to some businesses, the laptop, phone and TV screens we use every day are causing us big problems. </p><p>They claim these devices emit concentrations of "harmful blue light" which leaves us with tired eyes and poor sleep. One firm goes even further by suggesting this may contribute to a worrying long term condition, macular degeneration which leaves you with a permanent black hole in the centre of your vision.</p><p>Their solution? A pair of trendy looking spectacles which claim to filter out this blue light. </p><p>Listener, Sophie spends roughly 12 hours a day at a screen of some sort. She bought a pair but isn't sure if they work. So she's asked Greg to look into them and find out. </p><p>We get answers from two leading lights in the science of our eyes. Professor John O'Hagan has been a public health scientist for 46 years and is Visiting Professor in Laser and Optical Radiation Safety at Loughborough University. </p><p>Greg also meets sleep expert Russell Foster, professor of Circadian Neuroscience at the University of Oxford who's been researching body clocks for 38 years. </p><p>We put the evidence directly to Dhruvin Patel. He's the boss of one of the largest blue light filtering brands, Ocushield which turned over £2m last year.</p><p>How does he respond? And will Sophie keep using her trendy specs? </p><p>This series, we’re testing your suggested wonder-products. Seen an ad, trend or fad and wonder if there's any evidence to back up the claim? Tell us! Drop us an line to <a href="mailto:sliced.bread@bbc.co.uk">sliced.bread@bbc.co.uk</a> . </p><p>Presenter: Greg Foot Producer: Julian Paszkiewicz</p>