![]() “The aim of our study was to measure blue light from a variety of sources, see what levels of blue light people were likely to be exposed to and determine if it was appropriate to issue advice on the public health aspects,” O’Hagan told Reuters Health by email.Īfter comparing multiple colors on device screens, the researchers found that a white screen had the highest blue light emissions, so they used a white screen set at maximum brightness for their measurements. Then they compared the emissions to the ICNIRP’s exposure limits. O’Hagan and his team measured the blue light emitted by several sources, including mobile phones, tablet computers, laptops and lamps, over time periods similar to the way people use the devices. “Even under extreme long-term viewing conditions, none of the low energy light bulbs, computers, tablets and mobile phones we assessed suggested cause for concern for public health,” said lead author John O’Hagan, head of the Laser and Optical Radiation Dosimetry Group of Public Health England in Chilton, U.K.Īs people are using computers and phones more often and low-energy lighting like fluorescent and LED bulbs is becoming more common, the types of light human eyes are encountering is changing, the researches point out in the journal Eye.Ĭompared to traditional incandescent bulbs, electronic screens and low-energy light bulbs tend to emit more blue light, which has long been known to be toxic to the retina, they write.īased on that toxicity research, the International Commission on Non-Ionizing Radiation Protection (ICNIRP) has proposed a safe exposure limit, below which blue light is unlikely to harm a viewer’s eye. (Reuters Health) – Despite concerns that staring at devices putting out high amounts of the blue light wavelength could damage human retinas, a recent study finds that most devices put out less of that light than the blue sky on a clear day.
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