When I found the glasses, I believe they were in a chest or box ... though they *may* have been on a corpse.
After you pass through the civilian infested gate (where they are on the roof throwing rocks at you), turn right down the street planted with mines. Turn right again (from your characters' perspective) into a big courtyard with doors all around. There are a few rooms on the south side of the courtyard. I believe the glasses were in one of those rooms, either in a box or on a guy.
Pardon my vagueness, it's been a while.
Zombra