A potential prodromal marker for VSS is ..

split-second vision loss! I, like so many others here—and even the founder of VSI—experienced those brief moments where everything just goes black for a second right before the onset of symptoms. It’s like the lights flicker off and snap back on. I genuinely believe this could be the trigger point for VSS—possibly a momentary drop in blood flow to the occipital lobe, disrupting normal visual processing and setting everything off.