She does demonstrate lack of fusion on a number of instances.
Re lack of fusion:
She’s at a handicap if she has focal fusion problems, because she’s trained herself into this wide-eyed, focus switching routine. I guess she’s such an unappealing person that she took a lot of lessons on how to project empathy, which is why she developed the bug-eyes, the artificial enthusiasm, and the fake big smile.
Part of that routine is shifting her gaze around the crowd to try and make it look like she is appealing to everyone. And, you have to do it in at least two directions if you’re using dueling teleprompters, as if you just read from one, you look robotic.
If you combine this training with a brain-induced tracking deficit, you’re likely to get the weird eye tracking seen in this video. After all, she did wear major prism eyeglasses for a while, with the really thick prism on that weak left eye.
None of this would matter if she wasn’t pretending to be healthy enough to be our President. But she is... and she’s not.