6. Double vision
When you see a double image where there should only be one, you might have double vision. This condition can make ophthalmologists nervous, says Dr. Andreoli.
“There are some causes of double vision that are quite dangerous,” she adds. Sometimes patients end up being sent to the emergency room, as it could be a sign of a stroke or a issue with blood vessels of the brain. Even if the cause is something less dangerous, seeing two of everything is NEVER normal (maybe when you consume alcohol), so you should seek help immediately.
Takeaway: Double vision is a condition that requires emergency medical care.