Woman using smartphone with blue light
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Scientists say prolonged exposure to blue light can damage the retina and cause an incurable eye disease.

Research by the University of Toledo in the US has revealed that prolonged exposure to blue light triggers poisonous molecules to be generated in the eye’s light-sensitive cells that can cause macular degeneration – an incurable condition that affects the middle part of vision.

Blue light, which has a shorter wavelength and more energy compared to other colours, can gradually cause damage to the eyes. The risks to smartphones and laptop users mainly come from using their devices in poor light.

Dr Ajith Karunarathne, an assistant professor in the university’s Department of Chemistry and Biochemistry, said: “We are being exposed to blue light continuously and the eye’s cornea and lens cannot block or reflect it.

“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, which affects around 2.4% of the adult population in the UK, is a common condition among those in their 50s and 60s that results in significant vision loss.

Mobile phone usage and blue light can cause blindness
(Lauren Hurley/PA)

It is caused by the death of photoreceptor, ie light-sensitive cells in the retina.

Age-related macular degeneration (AMD) is the leading cause of blindness in the US and while it does not cause total blindness, AMD can make everyday activities such as reading and recognising faces difficult.

Photoreceptor cells need molecules called retinal to sense light and trigger signalling to the brain, enabling us to see.

The researchers found that being exposed to blue light causes retinal to set a chain of reactions that leads to toxic chemical molecules to be created in the photoreceptor cells.

Kasun Ratnayake, a PhD student at the University of Toledo who was involved in the study, said: “If you shine blue light on retinal, the retinal kills photoreceptor cells as the signalling molecule on the membrane dissolves.

Laptop and blue light
(Dominic Lipinski/PA)

“Photoreceptor cells do not regenerate in the eye. When they’re dead, they’re dead for good.”

The researchers found that introducing retinal molecules to other cell types in the body, such as cancer cells, heart cells and neurons, caused them to die off when exposed to blue light.

For those wanting to protect their eyes from blue light, Dr Karunarathne advises wearing sunglasses that can filter both UV and blue light outside and avoiding browsing on mobile phones or tablets in the dark.

The research is published in the journal Scientific Reports.

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