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Update: as a result of another comment, I stumbled into this: https://mdpi-res.com/d_attachment/ijms/ijms-23-09112/article...

My quick take on their experimental results is in the other comment, but in short it appears there will indeed be a trough of disillusionment somewhere down the line.

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Unless I'm misreading it, this paper looked at the effect on cells in isolation? But the reason we think 222nm is safe isn't that it has no effect on living cells, but that the living cells in our body are protected by a thin layer of dead cells that 222nm can't get through.

Here's the kind of paper I think is much more relevant, where they shined light into eyes directly: https://pubs.acs.org/doi/10.1021/acsphotonics.2c00041

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