Using the following illustration as a reference... If it is something not on the list, please specify.
"Know It All." I'm surprised to see there wasn't a version where you grab the corners of your glasses and adjust them (sometimes with both hands). Like this. In my case, I guess it's "double Buddha," or something. I do it sometimes and it probably looks a little dumb.
I wear antique style round (like John Lennon wore) frames with no nose pads (saddle type) with cable temples so I adjust them with great care because they are very flexible and floppy. Two handed.
I hate that one one of my frames, one nose pad is missing. When I wear them, they're always crooked. D:<<
Three of these interchangeably; regular, contempt, or sassy. I also do it the way that Nychthemeron mentioned, by the two corners. All depends on the degree to which they have slipped off of my nose, and how frustrated I am that they have done so.
Uh, depends on how they're needing to be adjusted, but probably "scholar" most of the time. Also, just sunglasses for me. Still don't need glasses.
I do it the Geordie style. I push on both sides of my frames where my frames meet the arms, with my thumb and middle finger making a sort of "visor" like Geordie LaForge like from star trek the next generation.