A habit of rubbing your eyes could come back to bite you.
We do that sort of thing without really thinking about it in moments when we’re tired, when we get something stuck in one eye, or when our eyes feel dry or itchy. It’s an attempt to alleviate the problem, but in reality we could be creating a bigger one, because every time we touch our eyes, we introduce the germs from our fingers (and everything we’ve touched since the last time we washed them) into a sensitive part of our bodies.