This is another explanation I got most recently in a discussion about the way my son learns.
Ok.. yes, I did have an appointment with a Medium- but I had wanted as much information as I could possibly acquire. We have been spending a lot of money on alternative treatments- if there was something simple they could help uncover- I was all about that.
They did help explain how his visual input – visual images into the brain enter like separate pictures. The analogy she used was that of a view finder which gives 2 images that you merge into one.
On a related search, I found this article that explains something of this visual issue from a Harvard Study in 2007.
Perhaps this information can help you… ?