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Excellently copied from the 3m websiteSorry but that's wrong. You can. It's just that how much is unknown and few studies have been done on eye specific exposure.
That said Isocyanates are an irritant to the eyes. Splashes can cause severe chemical conjunctivitis. At the very minimum you should have protective eyewear or faceshields.
That first bit isn't correct, you can smell them but the odour threshold for isocyanates, i.e. the level at which an individual can smell an isocyanate, is typically higher than the allowed exposure limits. In other words, if a painter smells the sweet, fruity, pungent odour of an isocyanate, they are probably already overexposed.
The overall point however is correct. You cannot rely on smell to detect if the filter is still working.