KM You're right in thinking that those IEEE recommendations have no actual connection to safety. They're (outdated) estimates of conscious perception of flicker visibility. There's no health data at all tied to recommendations for flicker at 100 Hz or higher. If you're curious, I've cited and analyzed the underlying research here: https://www.flickersense.org/led-health-effects/flicker-100-hz-scientific-literature.
While there are many reasons, including health reasons to prevent visible flicker, there's no data indicating that flicker has to be obviously visible in order to cause health problems. Most of us would probably vehemently disagree with the assumption that "if you can't see it, it can't hurt you."
jordan Why is this not being enforced? In the US, the FDA is responsible for creating safety regulations for light-producing devices. Their default position has been to not create any regulations for visible light products like LEDs/screens, but to require manufacturers to report any injuries to the FDA. As of when I first spoke with the FDA in the fall of 2022, no companies had yet done so, despite the requirement (and despite my knowing that I had personally reported my injuries to multiple companies). So it's up to us to advocate for ourselves. Fortunately, we can also use the FDA's reporting system to report our own injuries - I think it's hugely important that we do so in order to provide the FDA with the data that they need to justify taking steps needed to ensure actual safety. If you haven't yet done so, please lend your voice by reporting your experience to the FDA using Accidental Radiation Occurrence form 3649, as described here, even if you're not a US citizen (previously posted in this discussion).