I started to need glasses as a child. Back then most glasses had real glass lenses. The plastics weren't too good yet, and were more expensive, but were lighter than the glass lenses. I resisted wearing my glasses for several years. Partly because it added to my already existing differences, but also partly because the glass lenses were heavy. That made them uncomfortable, and they kept sliding down my slightly ski-nose. In high school I got fed up with trying to see things clearly that were farther off, so I finally took to wearing my glasses when I needed to. After a couple of years of that, my father finally realized how much trouble the heavy glass lenses were giving me when he started to give me driving lessons. He didn't want me to have an accident caused by falling glasses, so he finally paid for a pair with plastic lenses. By that time plastic lenses were better, too, so it worked out good for me. I did try contacts once as a young adult, but it didn't work out. My eyes are way too sensitive for them. I have now reached the point where I need correction for far, near, and intermediate vision. I have a pair of near/intermediate bifocals for watching TV and using the computer. I have a pair of progressive glasses for all 3 distances, for driving or walking around outside. They automatically darken in brighter light, which helps my sensitive eyes. I can see well enough without glasses to wander around inside, or even outside, but I can see far things better outside with my glasses on, so I prefer to wear them outside. Because I can get around indoors without them, I am able to give my eyes a break from constantly wearing glasses, which is good. It helps your periphrial vision to go eye naked for a while.
I don't think the glasses have changed my behavior, but they do help me see better. 
_________________
If a man does not keep pace with his companions, perhaps it is because he hears a different drummer.
Let him step to the music which he hears, however measured, or far away.--Henry David Thoreau