>>And the brain's
>>visual processing puts all that together into a single, coherent,
>>moving picture.
>
>Except when it doesn't! For a while there when I was having my ADEM
>attack in 2007, evoked potential testing showed that one of my eyes
>was reporting about 30 milliseconds behind the other one, which made
>perceiving anything with both eyes at once an... interesting...
>experience.

I cannot IMAGINE the kind of headache that would cause. ...what CAUSES that kind of shenanigans..?!