Double vision, also known as diplopia, is a condition where a person sees two images of a single object. This can occur in one eye (monocular diplopia) or both eyes (binocular diplopia). The images may be side by side, on top of each other, or both, making it difficult to focus on objects clearly. The causes of double vision can vary widely, including issues with the eye muscles, nerves, or brain. Conditions such as strabismus, cataracts, or neurological disorders can lead to this visual disturbance. Treatment options depend on the underlying cause and may include glasses, medication, or surgery.