Editor’s note: This article is Part 2 of 2. Here is Part 1.

Videos of Democratic presidential candidate Hillary Clinton’s recent speeches has repeatedly exposed her struggle with continued eye problems, and the situation may be much more serious than her campaign lets on.

And medical professionals familiar with the likely cause of her symptoms are calling for Clinton to undergo a transparent unbiased analysis to better understand whether her health issues could impact her ability to lead the country if elected.

In videos of Clinton speeches in Philadelphia, Las Vegas, and Cleveland show her eyes are often out of sync, with her left eye appearing to turn more than her right when looking toward her right.

The “disconjugate gaze” is a common symptom of increased intracranial pressure – swelling of the brain – that can put pressure on a nerve that controls the “lateral rectus muscle” and eye movement, a condition that most likely stems from a concussion Clinton suffered shortly before the Benghazi hearings in 2012, said Dr. Gerald Gianoli, an expert in intracranial pressure who has not personally examined Clinton.

Gianoli and others familiar with the condition contend the problem could also stem from far more serious medical issues, and are urging the former first lady to undergo a thorough examination to identify the problem to allow the public to asses her physical ability to lead the free world.

“It depends on the condition we are talking about,” said Gianoli, a neuro-otology surgeon with Louisiana’s Ear and Balance Institute who has worked with NASA scientists on similar issues. “If we are talking about elevated (intracranial pressure) … it can cause progressive problems.

“It can lead to blindness, deafness, progressive vertigo/balance problems, seizures/stroke and continued problems with concentration, memory and ability to mentally focus,” he said. “It could also lead to death if the lateral sinus thrombosis were to progress to include the opposite side.”

Gianoli said Clinton’s health situation could have significant impacts on her ability to serve as president, or not, but medical records released by her campaign make it impossible to tell.

“The problem is that the Clinton campaign has not been forthcoming with her medical issues. It is entirely possible that this could be treated and resolved without significant sequela but the problem is we don’t even know if it has been appropriately treated,” he said.

“There are reports that Mrs. Clinton has refused evaluation and treatment … because she is concerned about the ramification on her election prospects,” Gianoli said. “The bottom line is we do not know, but as concerned voters, we should know.”

“If she has untreated elevated (intracranial pressure) and given that she has had multiple episodes where she has been temporarily completely incapacitated, I would be very concerned that she will be intermittently completely unable to carry out the duties of the presidency,” he continued.

Gianoli believes that “without a doubt, (Clinton) is having at least intermittent double vision.”

Dr. John R. Coppedge, a surgical specialist from Texas with 37 years of experience, agrees with Gianoli’s assessment, though he also has not examined Clinton in person.

Coppedge questions why the Clinton campaign has not released more detailed medical records about Clinton’s buggy eyes, and instead attempted to dismiss the obvious issue as a conspiracy theory.

“My rational self would say that they could have defused all this a long time ago by releasing her medical records and having her undergo the same type of neurologic exam that every high school football player in America who ‘gets his bell rung’ on Friday night must undergo before he can suit up for the game next Friday,” he said.

While it’s unclear whether Clinton has undergone a thorough examination, her physician, Dr. Lisa Bardack, cannot release the results without her patient’s permission, Coppedge and Gianoli said.

“I sympathize with Dr. Bardack because she is in the position where she cannot be open and honest with the public. Since she is an internal medicine doctor, she may not be well educated on these issues and may not be aware of their significance,” Gianoli said. “However, if she is aware of their significance, she wouldn’t be the first doctor to have a patient with a serious medical condition where the patient has refused evaluation/treatment – and the doctor has to keep silent about it.”

Gianoli believes Clinton owes it to the American public to come clean about her ongoing, “serious” medical problems.

“She needs a full neurology evaluation, neuro-opthalmology evaluation, MRI, cerebral venography and a lumbar puncture,” he said. “It is possible that her status could be significantly improved. But at the same time, she risks demonstrating to the public that her medical problems are more serious than she has let on in the past.”