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Doublevision can be a symptom of many different visual conditions that affect children and adults, such as strabismus (eye turns: exotropia, esotropia, hypertropia), convergence insufficiency or visual conditions related to head injuries.
Bear in mind that the causes of the doublevision are very likely still present and that loss of vision in one eye has probably occurred due to lack of treatment.
Although suppression of doublevision can cause lazy eye, it is very important to understand that there are various causes and treatments for doublevision and that crossed eyes and lazy eye are not the same condition.