Unfortunately, they misted up rather quickly...and so my vision was significantly impaired

Interesting that they should still mist over significantly. Also, would not vision impairment also result from not being able to wear glasses with them (well, not really in a practical manner)? That would certainly affect me a lot as I'm incredibly short-sighted especially in the left eye (out of which I can see practically nothing over about a foot or so away) and it would be a pain to put on contact lenses every time I wanted to chop onions:-)