Comment by scythe
19 hours ago
Far UVC is carcinogenic when it reaches living tissue. However, it has a very short mean free path so it doesn't, generally, reach the growing layer of skin. It's less obvious whether exposed mucus membranes (lips, nose, tongue) or the eyes are affected. It probably doesn't reach the lens of the eye, which is good.
I think that is the same thing as saying that Far UVC is non-carcinogenic.
I actually read it as saying far UVC is probably carcinogenic for specific areas of your body (lips, maybe eyes).
I don't know if that's true, but it's what GP suggests to me.
That is not true. It can cause possibly eye irritation but animal trials have shown that it is not carcinogenic even to mucus membranes, eyes, and thin-skinned areas.
Ok… but hear me out…
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There is a small watery layer covering your cornea, this is enough to impede far UV-C (~222nm is safe, 254nm regular UV-C is dangerous to your eye!)