Your brain tells your eye muscles when to move, and usually, they look to a single viewing point. But for some people, the eyes focus on a different object in the same moment.
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Strabismus Crossed Eyes
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Strabismus (crossed eyes)
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Clermont Animal Hospital, Inc. - Some Siamese cats appear cross-eyed because the nerves from the left side of the brain go to mostly the right eye and the nerves from the right