Double vision, also known as diplopia, is a common visual symptom that can be caused by various medical conditions. There are several other synonyms for double vision, including binocular diplopia, binocular double vision, and heteronymous diplopia. Binocular diplopia is caused by a misalignment of the eyes, while heteronymous diplopia is caused by a lesion or injury to the nerves that control eye movements. Other synonyms for double vision include blurred vision, ghost images, and multiple images. Proper diagnosis and treatment of double vision depend on the underlying cause, and may include corrective lenses, eye exercises, or surgical intervention.