Big Balls attacked in DC after helping a woman
(twitter.com)
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There's really no way to know if someone has a concussion at the time of injury.
You can make some educated guesses based on past concussion history, the force of the blow, some of the pathognomonic subjective symptoms the sufferer reports afterwards, etc.
But that's the problem, everything is subjective & self-reported. Really the only way to know if someone suffered a concussion is if they are still experiencing concussion-like symptoms days later. But again, everything is self-reported and the symptoms are subjective & vague - headache, fatigue, nausea, light sensitivity, dizziness, moodiness, etc.
There are some field tests that athletic trainers use to try to diagnose concussions right on the sidelines, but similarly, it's all questionnaires and points systems.
Nothing is done for concussions anyway other than restricting the sufferer from doing anything until they stop reporting symptoms. So there's potential for secondary gain in either direction.
IIRC, it's not that we can't, there's eye tracking measures that they've tested for use. But what's the point?
I've never heard of the saccades eye tracking stuff besides chiropractic pseudoscience. Which has crept in to fill the void because the regular medical system doesn't do shit.
It's possible there's some academic or research level stuff, but it's certainly not being implemented in clinics & ERs for joes walking off the street.
Yeah, for the most part, all good ways to actually try and diagnose concussions are saved for American football, IIRC