How 'Blue Light' Affects Your Eyesight

Image: Getty Images

We all know it's a bad idea to use electronic screens directly before bed. (Despite this, most of us do it anyway — those Netflix shows aren't going to watch themselves, right?) The artificial light emitted by laptops, tablets and smartphones has been linked to disrupted sleep alongside a variety of more serious ailments. But is it actually dangerous? The evidence in this infographic makes for some scary reading...

The infographic below comes from, a US-based educational website about dry eye syndrome and macular degeneration. As this long list of (admittedly selective) evidence demonstrates, the potential impact of HEV wavelengths or 'blue light' on human eyes is not something to be treated lightly. In various studies, regular, intensive screen use has been linked to everything from mental fatigue and headaches all the way to retina damage and vision loss.

Of course, there's no conclusive proof that blue light exposure is damaging to humans— just as there's no hard evidence linking smartphones to cancer. Nevertheless, it's something to be mindful of; particularly if you spend most of your nights squinting at your phone in a dark bedroom...



    Your two links to have an extra 'e' in them. The URLs are fine, but the text is wrong on both of them.

    If you often find yourself working on your PC just before going to bed, try using f.lux to see if it helps your brain wind down more easily before sleeping. It gradually reduces the amount of blue light emitted by your monitor.

    Could swear I saw recently that the latest science says it doesn't do any harm.

      From what I've seen the science is mixed - bright lights (and blue lights in particular) probably do affect circadian rhythms, but there's limited (if any conclusive) evidence that apps like f.lux or changing the colour temperature actually do anything.

Join the discussion!

Trending Stories Right Now