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 ce

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 https://pubs.acs.org/doi/10.1021/acsphotonics.2c00041