Scientists have already warned about the blue and white light given off by tablets, smartphones and other electronics that can adversely affect the body’s internal clock.
But our beloved gadgets also spell disaster for our vision, even if temporarily.
In the New England Journal of Medicine, doctors described the cases of the two women, aged 22 and 40, who experienced “transient smartphone blindness” for several months.
They complained of recurring episodes of temporary vision loss in one eye for up to 15 minutes. After several medical tests and examinations, they couldn’t find out what exactly was causing the problem.
However, when they visited Dr. Gordon Plant of Moorfield’s Eye Hospital in London, the mystery was finally solved.
“I simply asked them, 'What exactly were you doing when this happened?'” the eye-specialist recounted the women’s visit.
It turned out, both the women had a habit of looking at their smartphones with only one eye fully open while the other one was covered by the pillow.
“So you have one eye adapted to the light because it's looking at the phone and the other eye is adapted to the dark,” Dr. Plant explained.
Once they put down their phones, they were temporarily blind because it takes “many minutes to catch up to the other eye that's adapted to the dark.”
Although, the loss of vision isn’t severe and can be solved by keeping both eyes wide open while using your smartphones in bed, it is suggested that you avoid that, according to a separate study.
Last year, a research from Brigham and Women’s Hospital in Boston, Massachusetts, published in the journal Proceedings of the National Academy of Sciences, confirmed conclusions from older studies that staring at electronic devices such as iPads and phones can lead to sleep deprivation, which in turn increases risk of certain cancers.