New Study Links Blue Light Exposure to AMD

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TOLEDO, Ohio—A newly released study provides new evidence that blue light from digital devices and the sun kills retinal cells and contributes to Age-related Macular Degeneration (AMD). The study, which was conducted by an optical chemistry researcher at The University of Toledo and recently published in the journal Scientific Reports, examines the effect that blue light exposure can have on the retina. It is the latest addition to a growing body of scientific data about the damaging effects of blue light on the eye.

“We are being exposed to blue light continuously, and the eye’s cornea and lens cannot block or reflect it,” said Ajith Karunarathne, PhD, assistant professor in the University’s department of chemistry and biochemistry. “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.”

Karunarathne’s lab found that blue light exposure causes retinal to trigger reactions that generate poisonous chemical molecules in photoreceptor cells. “It’s toxic. If you shine blue light on retinal, the retinal kills photoreceptor cells as the signaling molecule on the membrane dissolves,” Kasun Ratnayake, a PhD student researcher working in Karunarathne’s cellular photo chemistry group, said. “Photoreceptor cells do not regenerate in the eye. When they’re dead, they’re dead for good.”

Karunarathne introduced retinal molecules to other cell types in the body, such as cancer cells, heart cells and neurons. When exposed to blue light, these cell types died as a result of the combination with retinal. Blue light alone or retinal without blue light had no effect on cells.

“No activity is sparked with green, yellow or red light,” Karunarathne said. “The retinal-generated toxicity by blue light is universal. It can kill any cell type.”

The researcher found that a molecule called alpha tocopherol, a vitamin E derivative and a natural antioxidant in the eye and body, stops the cells from dying. However, as a person ages or the immune system is suppressed, people lose the ability to fight against the attack by retinal and blue light. “That is when the real damage occurs,” Karunarathne said.

The University of Toledo lab currently is measuring light coming from television, cell phone and tablet screens to get a better understanding of how the cells in the eyes respond to everyday blue light exposure.

“Every year more than two million new cases of age-related macular degeneration are reported in the United States,” Karunarathne said. “By learning more about the mechanisms of blindness in search of a method to intercept toxic reactions caused by the combination of retinal and blue light, we hope to find a way to protect the vision of children growing up in a high-tech world.”