People who read their smartphone in the dark while lying on their side may suddenly lose vision in the eye they’ve been using when they get up to do something else, says Dr. Gordon Plant, an ophthalmologist with Moorfields Eye Hospital in London.
It’s a temporary condition that lasts for several minutes, and there’s no risk of permanent damage, he says.
"I have seen a dozen or so similar cases," Plant says. “The reason I wish to make this known is because it leads to anxiety and unnecessary investigation because the patients — and their doctors — think they have had a transient ischemic attack."
A TIA is a temporary loss of blood circulation in the brain that can be a warning sign for stroke.
To avoid the problem, “look at the phone with both eyes,” says Plant.