What term means double vision?

• A. Coronary
• B. Diplopia
• C. Disc
• D. Dorsoflexion

Answer: (B)

Double vision is called diplopia. The term comes from Greek roots meaning two visual images, precisely describing what you perceive when you see two of the same object. It happens when the eyes aren’t perfectly aligned or when the brain can’t fuse the two eye images into one. Diplopia can be binocular (only present with both eyes open and often improves when one eye is closed) or monocular (persists with one eye open and usually points to an optical issue in that eye). In medical terminology, diplopia is the exact label for the symptom “double vision.” The other terms don’t fit: coronary refers to the heart, a disc can be an intervertebral or optic disc, and dorsoflexion describes a bending movement of a joint.