*blink*
The question of what information the visual system gets right before the eye movement is, quite literally, a chapter in my dissertation ...
Mefite Making You Bored For Science has some very interesting observations in the thread on saccadic masking (and other eye/brain illusions) in which we discover our visual systems blatantly lie to us all the time. (Also see Rhaomi's comment about the sci-fi novel that employs saccadic exploitation by space aliens!)