The danger of electricity is the first thing about it that you learn as a little child. And later you learn: the more voltage, the more danger. Even such people who never learn anything else about electricity know that all their life. Now the voltage has an unbeatable popularity.
Power sources with a fixed voltage were invented before such ones with a fixed amperage. Therefore the voltage was used as "the" number to tell the size of it. People like to be lazy, they like to have one single number to tell the size of things. Accordingly, for the devices that use electricity the traditon was established to say only the voltage (often it must fit to the fixed voltage of the source) and then be satisfied.
you'd have trouble burning without a deliberate effort
Well... No. The previous owner of my monitor was simply playing some Minecraft, among other games (mostly shooters). No deliberate effort, no negligence.
Before we did these burn-in tests together, he even explained proudly all the built-in anti-burn programs and features of the device, and how he did them regularly, and this is actually a real good device that has them all and runs most of them automatically.
"Paused" still image is not the only occasion where it happens.
I have just bought a used one, and when I did the tests, it showed 5 little hearts of Minecraft along the bottom line - not very strong and no big deal at all for me, but still there.
From what I can see in the picture, I would call it your left eyebrow. So maybe it's hurt because you called it your right eyebrow?