Badham, Stephen P, Hutchinson, Claire V · Graefe's archive for clinical and experimental ophthalmology = Albrecht von Graefes Archiv fur klinische und experimentelle Ophthalmologie · 2013 · DOI
Many people with ME/CFS report that their eyes feel slow and they struggle to follow moving objects. This was the first study to objectively test these complaints using eye-tracking equipment. Researchers compared eye movements in people with ME/CFS to healthy controls and found that while simple eye movements were similar between groups, people with ME/CFS had significant difficulty smoothly tracking a moving target—a task that requires sustained eye control.
This pioneering study provides the first objective, laboratory-based evidence validating patients' long-reported visual tracking difficulties, moving beyond subjective complaint to measurable dysfunction. Identifying oculomotor biomarkers could potentially improve diagnostic accuracy and help clinicians better understand the neurobiological basis of ME/CFS. These findings open new avenues for using eye-tracking as a potential objective diagnostic tool for ME/CFS.
This study does not establish whether smooth pursuit dysfunction is specific to ME/CFS or whether it occurs across all ME/CFS severities. The cross-sectional design cannot determine whether eye movement dysfunction causes other ME/CFS symptoms or vice versa. The findings do not clarify the underlying neural mechanisms responsible for the observed oculomotor impairment.
About the PEM badge: “PEM required” means post-exertional malaise was an explicit required diagnostic criterion for participant inclusion in this study — not that PEM was studied, observed, or discussed. Studies using criteria that do not require PEM (e.g. Fukuda, Oxford) are tagged “PEM not required”. How the atlas works →
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