Looking at the bright screens whole day has the potential to make you go blind.
According to a new study, published in the journal Scientific Reports, the Blue light emitted from smartphones, tablets might speed up our chance of becoming blind. Previous studies have shown how harmful blue light is, but researchers from The University of Toledo have shown the mechanism of how it can make molecules become "toxic."
The team found that shining blue light on eye cells transforms vital molecules into cell-killing poison - which can lead to age-related macular degeneration, one of the biggest worldwide causes of blindness.
"We are being exposed to blue light continuously, and the eye's cornea and lens cannot block or reflect it," said Ajith Karunarathne, assistant professor and one of the authors of the study.
"It's no secret that blue light harms our vision by damaging the eye's retina. Our experiments explain how this happens, and we hope this leads to therapies that slow macular degeneration, such as a new kind of eye drop."
Macular degeneration occurs when photoreceptor cells in the retina die. They do not regenerate, so "when they're dead, they're dead for good,".
Retinal - a substance formed by oxidation of vitamin A - changes and kills photoreceptor cells by dissolving some of their membranes.
The team added retinal molecules to other body cells, like cancer cells, heart cells, and neurons, and they also died when exposed to blue light because of the retinal becoming poisonous. Without the retinal, blue light had no effect on the other types of cell.
"No activity is sparked with green, yellow or red light, The retinal-generated toxicity by blue light is universal. It can kill any cell type."
Normally, there's a molecule in our eyes called alpha tocopherol, which is a natural antioxidant, and it stops photoreceptor cells from dying. But as we age, or our immune system takes a hit, we lose the ability to fight against the toxic retinal attack - and that's when the damage occurs.
You can use special sunglasses that filter both UV and blue light to try and combat the effects, but experts are unsure whether they do that much good.
You can also try and avoid smartphones and laptops when it's dark - something you should be doing anyway if you want to get a good night's sleep.
"We hope to find a way to protect the vision of children growing up in a high-tech world."
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