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Testing of eye movement shows that one eye has difficulty looking to the side and the other eye moves normally. An eye examination shows the eyes do not align -- either at rest, or when looking in the direction of the weak eye.
A complete medical and neurological examination must be done to determine if other parts of the nervous system are affected. Depending on the suspected cause, a patient may undergo blood tests, a head imaging study such as an MRI or CT scan, and possibly a lumbar puncture (spinal tap).
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