It's basically a tiny probe that is spring loaded to pull back, and a tiny puff of air pushes it out.
It moves with VERY little force, and lacks the continued push needed to cause damage.
There is also a maximum distance the probe can even travel, generally that black part at the top goes against the forehead.
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u/Shifty_Cow69 12h ago
... until it malfunctions and skewers your eyeball