Most UV consumer lights are probably Class 1M, which is supposed to be safe to the eye "under all reasonably forseeable conditions of operation, provided they are not viewed with magnifying optics of any kind." That quote is taken from an article by Thomas Sovino in the October, 2003 issue of Conformity that I found doing a Google search one time.
http://www.conformity.com/0310optical.pdf
Mine's 375 nm and says it's class 1M explicitly. One time when I used it I did experience some grainy sand-in-the-eyes symptoms, which would be consistent with mild UV over-exposure, but it could also have been almost anything else (dryness from wind and low humidity, contact wear, tiredness, etc). I normally wear thasses with UV-blocking lenses, and when I'm using the light for a long period of time I don goggles that have more protection on the sides. It's probably overly cautious, but UV-blocking safety glasses are much less than $10 at a big-box home improvement store, so over-cautiousness at least doesn't cost much.