This July 21, 2016 photo shows a smartphone held for a photograph in New York. In a letter published Wednesday, July 22, 2016 in the New England Journal of Medicine, doctors detailed separate cases of two women who experienced “transient smartphone blindness” for months. Doctors discovered it was caused when they looked at their device with one eye while in bed in the dark – and their other eye covered by a pillow. (Photo by Patrick Sison/AP Photo)
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