I typically go from working indoors on a computer to being outdoors in the field while I'm at work. It's frustrating to take off glasses and put on a pair of safety glasses all the time before leaving the office, but with a pair of these I just leave my safety glasses on all the time.

May sound simple, but makes life easier. I don't have to worry about setting my safety glasses down somewhere and walking off without them (can potentially get you in a lot of trouble (or worse yet, hurt) on today's construction sites.