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ME/CFS Science @mecfsscience.org · 01/02/2026

1) 🇩🇪 Researchers from Munich tested microcirculation in the eyes of Long Covid patients. They weren't interested in eyesight, but used the eye to study circulation and endothelial function in the brain. They call it a "accessible surrogate of cerebral microvascular function"

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ME/CFS Science @mecfsscience.org · 01/02/2026

2) The researchers found several abnormalities in their Long Covid cohort, even after accounting for cardiovascular risk factors, and the changes were most pronounced in the subgroup of patients meeting ME/CFS criteria.

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ME/CFS Science @mecfsscience.org · 01/02/2026

3) One of the abnormalities found by studying the retina is called venular flicker-induced dilation (fVID). It's how much the diameter of small veins (venules) changes in response to flickering light stimulation. In Long Covid patients fVID was reduced.

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