The brain receives different images when the two eyes do not focus together. Two images are seen, instead of one. This is called diplopia or double vision. Double vision can occur when the muscles surrounding the eyes do not work in unison.

A wide range of health problems can produce double vision and include:
* diabetes,
* myasthenia gravis,
* early cataract,
* brain tumor,
* retinal surgery,
* poorly fitted contact lenses,
* multiple sclerosis,
* Graves disease,
* brain injury,
* facial fractures, and
* alcohol intoxication.

In these kinds of health problems, nerves that carry impulses between the brain and the eye muscles, or the nerves of the eye muscles themselves, do not work correctly. Due to the wide range of disorders that can cause this symptom, anyone with double vision should seek medical care. Until this is done, it's a good idea to wear a patch over one eye.

Double vision may be resolved by treatment of the underlying health problem. If not, prescriptive eyeglasses may help. Muscle misalignment problems can be surgically corrected.

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