I wear glasses, all the time. I did not consult my halachic authority as to the style or materials composing the frames. (They are metal, by the way.) It’s not a halachic issue.
I wear clip-on sunglasses over my frames when I go out, especially in the spring, summer, and early fall. There is too much glare to be outside comfortably without them. I did not consult my halachic authority before buying them, because it’s simply not a halachic issue.
It boggles my mind that a Rav or Rebbe would be so involved in deciding that metal frames are OK, but not plastic frames, or vice versa, or that sunglasses are not OK.