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Diplopia or double vision is seeing two images of a single object, either one on top of the other, side by side, or a mix of both.
Page last modified: June 14, 2009 Disorders where one eye is higher than the other often cause vertical double vision (diplopia). Common causes include: Disorders where one eye is higher than the other often cause vertical double vision (diplopia). Common causes include: 1  Ocular muscle weakness (called hyper deviation).2  Central ocular control disturbances (here it is called skew).3  Otolithic imbalance (also called skew).hen it occurs even when both eyes are viewing, it is called a hyper deviation. Hyperphoria and hyperdeviation generally refer to the situation where the cause is known. For example, ocular palsies such as 4th nerve palsy can cause a hyper deviation or phoria.