Problems highlighted last week about Hillary Clinton’s eyes not appearing to be syncing with each other continued as she addressed the media aboard her campaign plane on Tuesday.

A video compilation produced by The American Mirror shows several instances of Clinton’s left eye seemingly acting independent from her right, before correcting.

Remarkably, her left eye turned inward as she was questioning Donald Trump’s “fitness” to be president.

It was at least the third time her roving eye issues have been evident.

In Philadelphia, as The American Mirror was the first to report last week, Clinton’s left eye was frequently crossing during a speech to Temple University students.

Writing for The Hill, Dr. John R. Coppedge observed:

It appears that she has a problem with her left sixth cranial nerve. That nerve serves only one function and that is to make the lateral rectus muscle contract. That muscle turns the eye in the direction away from the midline. 

It comes out of the base of the brain and runs along the floor of the skull, immediately beneath the brain before coursing upward to the eye. Dysfunction of that muscle causes the striking picture of the eyes not aiming in the same direction and causes the patient to suffer double vision.

Like all things medical, there is a long list of potential causes but in my opinion the most likely one, based on Clinton’s known medical history is an intermittent lateral rectus palsy caused by damage to or pressure on her sixth cranial nerve.

“If, as is statistically likely, Clinton’s transverse sinus is still blocked,” Coppedge writes, “she would still have increased pressure and swelling and decreased blood flow to her brain. That swelling would place pressure on the exposed portion of the sixth cranial nerve at the base of her brain, explaining the apparent lateral rectus palsy. And such a deficit can be partial and/or intermittent.”