A condition of having double vision or seeing two images of a single object; an optical or neurological condition where the visual system produces duplicated images.
From Greek diplo- (double) and opsis (vision), with the ending -y indicating a medical condition. The term dates to 19th-century medical terminology describing visual disturbances.
Diplopy isn't just a simple problem—it tells doctors a lot about what's wrong! If both eyes see separate images, it's binocular diplopy (usually eye muscle problems), but if one eye still causes doubled vision when the other is closed, something's wrong with that eye's internal optics.
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