LONDON (AP) - Warning: Looking at your smartphone while lying in bed at night could wreak havoc on your vision.
Two women went temporarily blind from constantly checking their phones in the dark, say doctors who are now alerting others to the unusual phenomenon.
The solution: Make sure to use both eyes when looking at your smartphone screen in the dark.
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.
The women complained of recurring episodes of temporary vision loss for up to 15 minutes.