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The most likely cause of double vision, or diplopia, is dysfunction of the muscles that stabilize and move the eyes. Many conditions can affect these muscles. These conditions can be divided into two groups, ones that affect the actual muscles or ones that affect the motor nerves that innervate the muscles. When these muscles are not performing correctly, the eyes will not be lined up and the patient will have double vision. See your doctor right away if you develop double vision, as it could be part of a more significant issue.
In all likelihood, the double vision you are experiencing is from an imbalance of the muscles that move your eyes. Depth perception requires that the two eyes see a slightly dissimilar image at the same time, but your eyes are drifting apart so much that your brain cannot put the images together. Depending upon the degree of muscle imbalance and the cause of the imbalance, your eye doctor may prescribe eyeglasses with prisms to move the images together, or he or she may recommend corrective surgery.
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