They have a diagram explaining the theory of why this is skin safe (doesn't penetrate the outer skin layer). But I see no reasoning as to why this is eye-safe. I would expect that the cornea is more fragile than the outer layer of dead skin.

One nice upside of using this in-situ is that it cleans surfaces just as much as it cleans the air. So just using this in the ducts / air filters is not as effective.