When the same experiment was conducted in the afternoon, there was no improvement in color vision, according to the University College London (UCL) study. On average there was a “significant” 17% improvement in color vision, which lasted a week. Some of the older participants had a 20% improvement that lasted a week, the findings showed. “We demonstrate that one single exposure to long-wave deep red light in the morning can significantly improve declining vision, which is a major health and well-being issue, affecting millions of people globally,” Jeffery, a professor at the UCL Institute of Ophthalmology, said in a university news release.
The study included 13 women and seven men, aged 34 to 70, who had no eye disease and normal color vision. The participants were exposed to three minutes of 670 nanometer (nm) LED deep red light in the morning between 8 a.m. and 9 a.m. In this new study, the investigators wanted to assess the effect of a single three-minute exposure once a week, and whether exposure in the morning or afternoon made a difference.
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Their color vision was tested again three hours after that exposure, and 10 participants were also tested one week after exposure. In previous work, the researchers found that daily three-minute exposure to long-wave deep red light switched on energy-producing mitochondria cells in the retina, giving a boost to naturally declining vision.
The results were published Nov. 24 in the journal Scientific Reports. More information “In the near future, a once a week three-minute exposure to deep red light could be done while making a coffee, or on the commute listening to a podcast, and such a simple addition could transform eye care and vision around the world,” he said.
Jeffery said the technology is “simple and very safe.” He also believes an easy-to-use device can be made available at an affordable cost to the general public. “This simple intervention applied at the population level would significantly impact on quality of life as people age and would likely result in reduced social costs that arise from problems associated with reduced vision,” he added.
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