Skeptics of Havana Syndrome/AHI argue the phenomena is a mass psychogenic illness.

But several different studies surfaced objective evidence of genuine injuries in AHI patients.

For example, studies in 2018 and 2024 found abnormal eye movements in most AHI patients that can't be faked.

These objective measures, along with abnormal vestibular studies show that AHI symptoms are real.

When my husband, Eric Haseltine, PhD, and I interviewed Mark Lenzi, who reported experiencing anomalous health incidents (AHI), commonly known as Havana syndrome, Mark told us that abnormal eye movements were among the reasons he was medically evacuated from Guangzhou, China, in 2018.

Those abnormal eye movements were discovered when Mark took the U.S. State Department Havana Acquired Brain Injury Tool (HABIT) test.

The HABIT test evaluated eye convergence, eye tracking, vestibular, auditory, and neurocognitive abilities, and was administered to officers and family members in the field to ”evaluate medical findings associated with directed energy exposure in certain foreign environments" (per the United States government). See photos below.

Given Mark's abnormal eye movements, the question is: Could abnormal eye movements in other victims provide clues that help doctors better understand and diagnose AHI cases?

Several studies suggest that they could.

But first, what is Havana Syndrome?

Havana syndrome refers to a collection of symptoms reported by U.S. government personnel and others, often beginning suddenly with intense headaches, dizziness, and unusual auditory or sensory experiences, as described in detail by investigative reporters Michael Ray and Oriana Zill de Granados in their 2026 book “The Havana Syndrome”. [1]

Some affected individuals report persistent headaches, tinnitus, balance problems, insomnia, visual difficulties, and cognitive complaints lasting months to years. Although some symptoms resemble those associated with concussion or mild traumatic brain injury, the underlying causes of AHIs remain uncertain. [2–4].

Brain scans and other objective tests of AHI patients have yielded conflicting results, prompting a number of........

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