Eye-Tracking May Offer Objective Signs of Havana Syndrome
The article examines whether eye-movement tests can help document anomalous health incidents known as Havana syndrome. It notes that patients report headaches, dizziness, and cognitive problems, while skeptics have called the condition psychogenic. Studies cited found abnormal eye movements and vestibular findings in many patients, suggesting measurable injury rather than symptoms that can be faked.
A U.S. State Department screening tool, HABIT, assessed eye convergence, tracking, vestibular, auditory, and neurocognitive function in personnel and relatives stationed abroad. One patient, Mark Lenzi, was medically evacuated from Guangzhou in 2018 after abnormal eye movements appeared on that test.
In a 2018 University of Pennsylvania evaluation of 21 government personnel reporting AHIs, 71% showed ocular-motor abnormalities. Convergence insufficiency and impaired smooth pursuit each occurred in 52%; saccades—rapid gaze shifts—were also assessed. These findings are presented as objective signs that are difficult to fake, contrasting with conflicting brain scans and psychogenic explanations.
If eye-tracking and vestibular tests prove reliable, they could give patients with contested symptoms a more objective basis for diagnosis and care, potentially reducing stigma for government personnel, families, and others reporting AHIs. Clinicians and employers may face clearer discussions about evaluation and accommodation, while insurers or agencies could weigh such evidence in claims. Still, these tests may not explain every case or resolve debates about cause, so their impact likely depends on replication, standardization, and careful communication about what findings do and do not establish.