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You are correct to be concerned. Children will adopt an abnormal face turn if it helps to improve their vision, and their vision may test as normal when checked. Problems that can be associated with an abnormal head posture include strabismus (misaligned eyes), nystagmus (constant shaking of the eyes), and refractive error (need for glasses), among others. It can also be cause by reduced hearing in one ear, tight neck muscles, or can even be due to a habit. A visit to an eye doctor is a good place to start looking for the cause.