As you clearly can see, I only do for pictures. I don't like having pictures taken. That's about the only reason my eyes are only sensitive to camera light and natural sunlight and stuff like that.
I don't wear dark sunglasses inside because I thank I'm cool. I wear them inside is because my eyes are sensitive to certain types of lighting bye wearing dark sunglasses my eyes are more comfortable.
Some people wear them because of photo-sensitivity, their eyes are very sensitive to all light natural and artificial and therefore have to wear them to keep their eyes from aching, my eyes are sensitive to natural light but artificial light doesn't make my eyes hurt. Also some people don't carry cases with them all the time and therefore think it's easier to just leave them on when they go inside rather then carrying them in their hands.
Well, I don't know about everyone else, but my eyes tell my every emotion. I really don't want people to know how I'm feeling, so I wear sunglasses except for when I'm sleeping. :P
or to hide red eyes...............
I wear them inside is because my eyes are sensitive to certain types of lighting bye wearing dark sunglasses my eyes are more comfortable.
Other because of eye problems.