I just found this on childrensvision.com.
Visual Spatial Orientation helps us with letter reversals. Many parents and educators considered letter reversals after age seven to be a symptom of dyslexia. While this can be true, the most common cause of reversals in older children is a lack of visual spatial development--consistently knowing left from right, either in relationship to their own bodies or in the world around them. Children with poor visual processing have not developed adequate skills in visual perception and spatial orientation, such as laterality and directionality. Also, children who experience frequent double vision deal with such visual confusion that their brains often misinterpret their visual input.
