What is the definition or description of: trouble seeing in both eyes?

Blurred vision : Inability to see clearly in both eyes is a huge topic that can be answered in a general statement. Difficulty focusing may be caused by benign and treatable causes such as the need for glasses, to serious and Vision threatening diseases, some which may not be curable. The best way to determine the health of the eyes is by examination by an ophthalmologist or optometrist.