"In Thursday's New England Journal of Medicine, doctors detailed the cases of the two women, ages 22 and 40, who experienced 'transient smartphone blindness' for months," notes an Associated Press post. "The women complained of recurring episodes of temporary vision loss for up to 15 minutes. They were subjected to variety of medical exams, MRI scans and heart tests. Yet doctors couldn't find anything wrong with them to explain the problem." Read more.