Wow! This is a particularly well-written essay
Agree.... it's well written and difficult to find any miss for us to comment on .... LOL :D
A few suggestions;
They were going to get the glasses they needed and deserved
.... better specify what glasses to make it more clear to the reader.
Mothers brought their young children and men helped their elderly parents find a chair while they waited in line.
Mothers were bringing their young kids, men were helping their elderly parents find a chair while they were waiting in line.I had never thought about how easy it was to get glasses until I met people who didn't have that opportunity.
.... this one sounds a bit confusing about what you really try to mean. Are you talking about the contrast between privileged and underprivileged. Better rephrase this one to convey your thoughts better.