There is a serious vision problem in China. I thought I wouldn't have to deal with it after I was finished teaching children.
Apparently, many parents won't buy glasses for children because they think the kids' eyesight will deteriorate more. This created a problem in the classroom as I had students running up to the board to squint at what was written, then scurry back to their seats to write it on their paper. At least I was told about this prior to my first class.
Now I have the problem at the graduate level. Last year I had students who refused to answer questions, and when pressed to answer would reply that they forgot their glasses. This year, I have students who say they can't see the board or projection screen clearly and, therefore, cannot answer the question.
The irony of this situation now is that I write in large letters on the board and use 18-20 point font for my lectures. I can see everything clearly from the back wall, which is ten feet behind the last seat. Not only that, but there are usually three rows of tables that can sit three students each at the front of the room.
It pains me to think that I might have to fail a student or three simply because he or she isn't responsible enough to get new glasses or sit closer to the front of the class.