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Video that shows flickering says nothing about how your eyes/brain perceive the device. I've been scouring Pubmed/Google Scholar looking for adverse neurological effects from PWM in display lighting and haven't been able to find anything. That's not evidence that it's zero in 100% of people but I am confident that it isn't a widespread problem at high & imperceptible frequencies.
Out of interest, pupillary light reflex latency in a healthy eye is around 250 ms. So the assertion I've read that adverse effects from high-frequency lighting PWM are caused by rapid oscillations of the pupils make no sense to me.
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