Is it a Montessori preschool? I know that they believe in using "real" glasses, etc. with the children. Most other schools/daycares would not usually have glass around where children could handle it.

I would definitely speak to them about paying your medical bill. That said, I think I would ask myself if there is a pattern of things with the daycare that I was uncomfortable about or if this is the first incident. If it seems to be an isolated event, I would treat it as such. If it is part of a pattern, I would be looking elsewhere.