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Amblyopia is the medical term used when the vision in one of the eyes is reduced because the eye and the brain are not working together properly. The eye itself looks normal, but it is not being used normally because the brain is favoring the other eye. This condition is also sometimes called lazy eye.

A child with amblyopia wearing an eye patch.
A child with amblyopia wearing an eye patch.
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Department of Health and Human Services NIH, the National Institutes of Health