Amblyopia is decreased vision in one or both eyes due to abnormal vision development in infancy or childhood. In the first few years of life, the brain must learn to see or interpret the images provided by the eyes. In amblyopia, the brain receives a poor image from the eye and thus does not learn to see well. Vision loss occurs in this case because nerve pathways between the brain and the eye are not properly stimulated. In amblyopia, there may not be an obvious problem of the eye. Another word for amblyopia is often “lazy eye.” It is the leading cause of vision loss amongst children.